1
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Sugimoto D, Micheli LJ, Meehan WP. Lower Extremity Strength Relative to Body Mass in Pediatric Female Athletes: Implications for Anterior Cruciate Ligament Injury. Clin Pediatr (Phila) 2024; 63:1239-1246. [PMID: 38053390 DOI: 10.1177/00099228231216316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
This study compared lower extremity (LE) muscular strength by 3 groups of female athletes using chronological age and consideration of age of peak height velocity (PHV). Isometric quadriceps, hamstrings, and hip abductors strength were assessed from physically active, pediatric females. The body mass normalized isometric strength (N m/kg) was compared by the 3 age groups. There were 388 young female athletes (<10 years [14.2%], 11-14 years [48.7%], and 15-18 years [37.1%]). The body mass normalized LE strength was lower in 11-14 years compared with <10 years (quadriceps [P = .001], hamstrings [P = .001], and hip abductors [P = .037]) as well as in 15-18 years relative to <10 years in quadriceps (P = .001) and hamstrings (P = .001). The analysis results were consistent with both chronological age alone and incorporating effects of age of PHV. In short, body mass normalized LE strength (quadriceps, hamstrings, and hip abductors) of 11-14 years females was lower than <10 years females.
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Affiliation(s)
- Dai Sugimoto
- Faculty of Sport Sciences, Waseda University, Tokyo, Japan
- The Micheli Center for Sports Injury Prevention, Waltham, MA, USA
| | - Lyle J Micheli
- The Micheli Center for Sports Injury Prevention, Waltham, MA, USA
- Department of Orthopaedics and Sports Medicine, Boston Children's Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - William P Meehan
- The Micheli Center for Sports Injury Prevention, Waltham, MA, USA
- Department of Orthopaedics and Sports Medicine, Boston Children's Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
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2
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Larruskain J, Lekue JA, Angulo P, Santisteban JM, Diaz-Beitia G, Martin-Garetxana I, Gil SM, Bidaurrazaga-Letona I, Monasterio X. An injury burden heat map of all men's and women's teams of a professional football club over a decade. Res Sports Med 2024; 32:740-750. [PMID: 37358165 DOI: 10.1080/15438627.2023.2228959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 06/19/2023] [Indexed: 06/27/2023]
Abstract
The aim was to present a descriptive 10-season summary of injury data from all teams of a professional football club using a heat map approach. Injuries and exposure time were registered according to the FIFA consensus in all men's and women's teams from Athletic Club over 10 seasons. A team-by-injury table was created, showing the incidence, median severity, and burden in each cell. Cells were coloured based on the injury burden value using a green - yellow-red gradient (lowest to highest). The highest overall injury burden was found in the women's 2nd and 1st teams and the men's U(under)17 team (>200 days lost/1000 h). Muscle injury burden demonstrated an increasing pattern with age. Knee joint/ligament injuries, particularly anterior cruciate ligament ruptures, had the highest impact on women's teams, followed by the men's 2nd team. In comparison, ankle joint/ligament injuries had a relatively low injury burden in most teams. Growth-related injuries were the most impactful injuries in the men's U15 and younger teams, and the women's U14 team. In conclusion, epidemiological data on injuries can inform and guide injury management processes. New and improved visualization methods might be important assets when presenting injury data to key decision-makers.
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Affiliation(s)
| | | | - Paco Angulo
- Medical Services, Athletic Club, Lezama, Spain
| | | | | | | | - Susana M Gil
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Iraia Bidaurrazaga-Letona
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
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3
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Pinheiro AP, Aucouturier JJ, Kotz SA. Neural adaptation to changes in self-voice during puberty. Trends Neurosci 2024:S0166-2236(24)00142-5. [PMID: 39214825 DOI: 10.1016/j.tins.2024.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 07/18/2024] [Accepted: 08/01/2024] [Indexed: 09/04/2024]
Abstract
The human voice is a potent social signal and a distinctive marker of individual identity. As individuals go through puberty, their voices undergo acoustic changes, setting them apart from others. In this article, we propose that hormonal fluctuations in conjunction with morphological vocal tract changes during puberty establish a sensitive developmental phase that affects the monitoring of the adolescent voice and, specifically, self-other distinction. Furthermore, the protracted maturation of brain regions responsible for voice processing, coupled with the dynamically evolving social environment of adolescents, likely disrupts a clear differentiation of the self-voice from others' voices. This socioneuroendocrine framework offers a holistic understanding of voice monitoring during adolescence.
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Affiliation(s)
- Ana P Pinheiro
- Faculdade de Psicologia, Universidade de Lisboa, Alameda da Universidade, 1649-013 Lisboa, Portugal.
| | | | - Sonja A Kotz
- Maastricht University, Maastricht, The Netherlands; Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
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4
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Ribeiro N, Martinho DV, Pereira JR, Rebelo A, Monasterio X, Gonzalo-Skok O, Valente-Dos-Santos J, Tavares F. Injury Risk in Elite Young Male Soccer Players: A Review on the Impact of Growth, Maturation, and Workload. J Strength Cond Res 2024:00124278-990000000-00530. [PMID: 39178105 DOI: 10.1519/jsc.0000000000004889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2024]
Abstract
ABSTRACT Ribeiro, N, Martinho, DV, Pereira, JR, Rebelo, A, Monasterio, X, Gonzalo-Skok, O, Valente-dos-Santos, J, and Tavares, F. Injury risk in elite young male soccer players: a review on the impact of growth, maturation, and workload. J Strength Cond Res XX(X): 000-000, 2024-The long-term development of young male soccer players involves a prolonged period of significant adjustments, highlighting the importance of studying the complex interaction between dynamic variables, including workload, and inherent elements like growth and maturity. This analysis examines the intricate connections involving the development, maturity, workload, and susceptibility to injuries among adolescent male soccer players. Significantly, these connections become prominent at the peak height velocity (PHV) period, a crucial moment in maturation. Growth rates vary among individuals, and higher rates have been associated with an increased risk of injury in young soccer players, particularly during periods of rapid growth. Identifying possible risk factors and understanding the complex connections between them is crucial to developing specific methods for reducing the risk of injury. Sharing this valuable information with essential stakeholders is crucial for guaranteeing young athletes' comprehensive growth and maturation process. Furthermore, this review emphasizes the immediate need for long-term studies and thorough injury analyses to comprehend better the dynamic interactions that influence injury patterns in young male soccer players. This review will allow practitioners to better understand the main modifiable and nonmodifiable risk factors for injury and provide essential information focusing on practical strategies, facilitating more informed decision making by all stakeholders. The review aims to clarify these complexities and offer crucial insights that can assist in designing and implementing efficient strategies to reduce the risk of injury, specifically for the challenges faced during PHV and within the broader framework of long-term athletic development in young soccer.
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Affiliation(s)
- Nuno Ribeiro
- Faculty of Physical Education and Sport, Lusófona University, Lisbon, Portugal
- Medical and Performance Department, Sporting Clube de Portugal, Lisbon, Portugal
| | - Diogo V Martinho
- CIDEFES, Center for Research in Sport, Physical Education, and Exercise and Health, Lusófona University, Lisbon, Portugal
| | - João R Pereira
- COD, Center of Sports Optimization, Sporting Clube de Portugal, Lisbon, Portugal
- Medical Services, Athletic Club, Lezama, Spain
| | - André Rebelo
- COD, Center of Sports Optimization, Sporting Clube de Portugal, Lisbon, Portugal
- Medical Services, Athletic Club, Lezama, Spain
| | - Xabier Monasterio
- Department of Communication and Education, Universidad Loyola Andalucía, Seville, Spain; and
| | - Oliver Gonzalo-Skok
- Research Unity in Sport and Physical Activity (CIDAF, UID/DTP/04213/2020), Faculty of Sport Sciences and Physical Education, University of Coimbra, Coimbra, Portugal
| | - João Valente-Dos-Santos
- COD, Center of Sports Optimization, Sporting Clube de Portugal, Lisbon, Portugal
- Medical Services, Athletic Club, Lezama, Spain
| | - Francisco Tavares
- Medical and Performance Department, Sporting Clube de Portugal, Lisbon, Portugal
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Butcher AJ, Ward S, Clissold T, Richards J, Hébert-Losier K. Maturation and biomechanical risk factors associated with anterior cruciate ligament injury: Is there a link? A systematic review. Phys Ther Sport 2024; 68:31-50. [PMID: 38908221 DOI: 10.1016/j.ptsp.2024.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 06/09/2024] [Accepted: 06/10/2024] [Indexed: 06/24/2024]
Abstract
OBJECTIVE To establish the potential link between sex-specific maturation and biomechanical factors associated with ACL injury during dynamic tasks. DESIGN Systematic review. LITERATURE SEARCH Five databases (CINHAL®, Cochrane Library, PubMed®, Scopus®, and SPORTDiscus) were searched and monitored until 27 May 2024. STUDY SELECTION CRITERIA Cross-sectional, cohort, case-control, or interventional studies reporting one or more biomechanical variable linked with ACL injury and which assessed participants across two or more maturation phases were considered eligible. DATA SYNTHESIS Studies were assessed for risk of bias using a modified version of the Newcastle Ottawa Scale and overall quality of evidence was rated using GRADE. Metrics and effect sizes were presented where available. RESULTS Eighteen included studies examined 400 males, 1377 females, and 315 participants of undefined sex across various maturation phases. The methodological quality of most studies (n = 16) was considered good, and satisfactory for two. Knee abduction angle, knee abduction moment, knee flexion angle, and ground reaction forces were most commonly reported. Knee abduction angles and moments and knee flexion angles were greater in late and post-pubertal females than males and pre-pubertal females during both landing and cutting tasks. When normalised for body mass, ground reaction forces were generally greater in males compared to females overall and for less mature participants for both sexes. Overall quality of evidence was low or medium across the four biomechanical measures. CONCLUSION Sex-specific maturation considerations are important in the targeted development and implementation of ACL injury risk identification and prevention strategies.
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Affiliation(s)
- Anna J Butcher
- Division of Health, Engineering, Computing and Science, Te Huataki Waiora School of Health, University of Waikato, Adams Centre for High Performance, 52 Miro Street, 3116, Tauranga, New Zealand.
| | - Sarah Ward
- Department of Exercise Sciences, University of Auckland, Suiter Street, Newmarket, New Zealand. https://twitter.com/sarahward_nz
| | - Tracey Clissold
- Toi Ohomai Institute of Technology, 70 Windermere Drive, Poike, 3112, Tauranga, New Zealand
| | - Jim Richards
- Allied Health Research Unit, University of Central Lancashire, Preston, England, United Kingdom. https://twitter.com/ProfJimRichards
| | - Kim Hébert-Losier
- Division of Health, Engineering, Computing and Science, Te Huataki Waiora School of Health, University of Waikato, Adams Centre for High Performance, 52 Miro Street, 3116, Tauranga, New Zealand. https://twitter.com/KimHebertLosier
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Chen L, Yan R, Xie L, Zhang Z, Zhang W, Wang H. Maturation-specific enhancements in lower extremity explosive strength following plyometric training in adolescent soccer players: A systematic review and meta-analysis. Heliyon 2024; 10:e33063. [PMID: 38994103 PMCID: PMC11238047 DOI: 10.1016/j.heliyon.2024.e33063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 06/12/2024] [Accepted: 06/13/2024] [Indexed: 07/13/2024] Open
Abstract
Background For adolescent soccer players, good sprinting and jumping abilities are crucial for their athletic performance. The application of plyometric training on boosting explosive strength in adolescent soccer players is contingent upon the maturation phase, which can mediate the training-induced adaptations. Purpose This systematic review and meta-analysis aim to explore the maturation effect of plyometric training on the lower limb explosive power of adolescent soccer players, with vertical countermovement jump (CMJ) and 20-m sprint as the main outcome indicators. Methods An extensive search of the literature was carried out on various databases including PubMed, Web of Science, Scopus, ProQuest, and the China National Knowledge Infrastructure (CNKI), covering the time period from the establishment of each database to February 6, 2023. The search was conducted using English keywords such as 'Plyometric,' 'Adolescent,' 'football,' and 'Explosive strength.' This study utilized the Cochrane risk of bias assessment tool to conduct a standardized quality evaluation of all the included literature. Additionally, the Review Manager 5.4 software was employed to perform data analysis on all the extracted data. Results A total of 17 studies involving 681 adolescent soccer players aged 10 to 19 were included. Plyometric training significantly improved CMJ performance across different maturation stages, especially in the post-peak height velocity stage (POST-PHV) [MD = 4.35, 95 % CI (2.11, 6.59), P < 0.01, I2 = 60 %]. The pre-peak height velocity stage (PRE-PHV) showed the next best improvement [MD = 3.00, 95 % CI (1.63, 4.37)], while the middle-peak height velocity stage (MID-PHV) showed the least improvement [MD = 2.79, 95 % CI (1.16, 4.41), P < 0.01, I2 = 49 %]. However, improvements in 20 m sprint ability were only observed in the PRE-PHV [MD = -0.06, 95 % CI (-0.12, 0), P < 0.01, I2 = 0 %] and MID-PHV [MD = -0.18, 95 % CI (-0.27, -0.08), P < 0.01, I2 = 0 %] stages. Conclusion Plyometric training serves as a potent strategy for boosting the lower limb explosive strength of adolescent soccer players, and the training effect is closely related to the players' biological maturity. Considering biological maturity is a key aspect that this study deems essential for the formulation of effective training programs for these adolescent players.
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Affiliation(s)
- Lunxin Chen
- Digitalized Strength and Conditioning Training Laboratory, Guangzhou Sport University, Guangzhou, China
| | - Ruixiang Yan
- Digitalized Strength and Conditioning Training Laboratory, Guangzhou Sport University, Guangzhou, China
| | - Lin Xie
- Digitalized Strength and Conditioning Training Laboratory, Guangzhou Sport University, Guangzhou, China
| | - Zhiyong Zhang
- Digitalized Strength and Conditioning Training Laboratory, Guangzhou Sport University, Guangzhou, China
| | - Wenfeng Zhang
- School of Athletic Training, Guangzhou Sport University, Guangzhou, China
| | - Hengtong Wang
- School of Athletic Training, Guangzhou Sport University, Guangzhou, China
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7
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Monasterio X, Gil SM, Bidaurrazaga-Letona I, Cumming SP, Malina RM, Williams S, Lekue JA, Santisteban JM, Diaz-Beitia G, Larruskain J. Estimating Maturity Status in Elite Youth Soccer Players: Evaluation of Methods. Med Sci Sports Exerc 2024; 56:1124-1133. [PMID: 38377009 DOI: 10.1249/mss.0000000000003405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
PURPOSE The objective of this study is to evaluate the concordance of predicted maturity status classifications (pre-, circa-, or post-peak height velocity (PHV)) relative to observed age at PHV in youth soccer players. METHODS Longitudinal height records for 124 male soccer players were extracted from academy records spanning the 2000 to 2022 seasons. Age at PHV for each player was estimated with the Superimposition by Translation and Rotation model. Players were classified as pre-, circa-, or post-PHV using both ±1- and ±0.5-yr criteria to define the circa-PHV interval. Maturity status was estimated with several prediction protocols: maturity offset (Mirwald, Moore-1, Moore-2), maturity ratio (Fransen), and percentage of predicted adult height (PAH%) using the Khamis-Roche and Tanner-Whitehouse 2 equations using several bands: 85% to 96%, 88% to 96%, 88% to 93%, and 90% to 93% for the circa-PHV interval, and visual evaluation of individual growth curves alone or with PAH% based on Khamis-Roche and Tanner-Whitehouse 2. Concordance of maturity status classifications based on complete growth curves and predicted estimates of maturity status was addressed with percentage agreement and Cohen's kappa. RESULTS Visual evaluation of the growth curves had the highest concordance (≈80%) with maturity status classifications (pre-, circa-, post-PHV) based on longitudinal data for individual players. Predicted maturity offset with the Mirwald, Moore-1, and Fransen equations misclassified about one-third to one-half of the players, whereas concordance based on PAH% varied with the band used, but not with the method of height prediction. CONCLUSIONS Visual assessment of the individual growth curves by an experienced assessor provides an accurate estimate of maturity status relative to PHV. Maturity offset prediction equations misclassify the majority of players, whereas PAH% provides a reasonably valid alternative.
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Affiliation(s)
| | - Susana M Gil
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, SPAIN
| | - Iraia Bidaurrazaga-Letona
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, SPAIN
| | - Sean P Cumming
- Department for Health, University of Bath, Bath, UNITED KINGDOM
| | - Robert M Malina
- Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX
| | - Sean Williams
- Department for Health, University of Bath, Bath, UNITED KINGDOM
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8
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Henderson VK, Brismée JM. New clinical decision tool to assist physical therapists with joint mobilization application to the pediatric population. J Man Manip Ther 2024; 32:304-309. [PMID: 38426695 PMCID: PMC11216253 DOI: 10.1080/10669817.2024.2322213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Accepted: 02/18/2024] [Indexed: 03/02/2024] Open
Abstract
Joint mobilizations are well-established and extensively researched treatment modality for adults. However, it remains largely unexplored in the pediatric population. Physical therapists hesitate to perform joint mobilization on children because of lack of knowledge, concern for the developing skeletal system, and the paucity of research on the topic. The aim of this article is to present a decision tool created for a continuing education course with the purpose to instruct pediatric therapists in the safe and effective use of joint mobilizations in children. It is based on the pediatric paradigm of developmental and functional assessment to best address the concerns and preferences of physical therapists (PTs). To advance research in pediatric joint mobilization, PTs should listen to the concerns of pediatric therapists and respond to those concerns with effective, evidence-supported training. This decision tree will serve as a resource for the education of pediatric therapists in the safe and effective use of joint mobilizations.
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Affiliation(s)
| | - Jean-Michel Brismée
- Department of Rehabilitation Sciences, Center for Rehabilitation Research, Texas Tech University Health Sciences Center, Lubbock, USA
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9
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Clarke LM, Jones RM, Hiremath SV, Franklin C, Wright WG, Tucker CA. The Effects of Age and Height on Gait Smoothness in Adolescent Athletes. CHILDREN (BASEL, SWITZERLAND) 2024; 11:223. [PMID: 38397335 PMCID: PMC10887815 DOI: 10.3390/children11020223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/03/2024] [Accepted: 02/07/2024] [Indexed: 02/25/2024]
Abstract
(1) Background: Despite evidence of increased rates of sports injury during the years surrounding peak growth in adolescents, little is known regarding the relationship between adolescent growth and gait stability. The aim of this study was to gain a better understanding of how chronological age and height relate to gait stability in both male and female adolescents. (2) Methods: Participants (N = 67; females: n = 34, ages 8.7-15.9 years; males: n = 33, ages 10.0-16.7 years) completed two trials of treadmill walking at varying speeds: the preferred walking speed and 30% above and below. Trials were separated by a bout of fatiguing exercises. HarmonicRatios of the trunk, calculated from acceleration signals taken during walking, were used to quantify gait stability. Data were separated by sex and relationships between height and chronological age, and HarmonicRatios were assessed using multiple linear regression. (3) Results: Females' HarmonicRatios improved with chronological age both before and after fatigue. Males' HarmonicRatios increased with chronological age before fatigue; however, this effect was eliminated post-fatigue. Females' height was negatively associated with HarmonicRatios post-fatigue. Males' height was positively associated with HarmonicRatios pre-fatigue. (4) Conclusions: The study findings suggest sex differences in the effects of fatigue on gait stability during adolescence. In both sexes, HarmonicRatios increased with chronological age. These improvements were eliminated for males and altered for females with fatigue. The results of this study indicate the need for the reevaluation of sports progression based on chronological age in adolescents.
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Affiliation(s)
- Lindsay M. Clarke
- Department of Health and Rehabilitation Sciences, College of Public Health, Temple University, Philadelphia, PA 19122, USA; (S.V.H.); (W.G.W.)
| | - Resa M. Jones
- Department of Epidemiology and Biostatistics, College of Public Health, Temple University, Philadelphia, PA 19122, USA;
- Fox Chase Cancer Center, Temple University Health, Philadelphia, PA 19140, USA
| | - Shivayogi V. Hiremath
- Department of Health and Rehabilitation Sciences, College of Public Health, Temple University, Philadelphia, PA 19122, USA; (S.V.H.); (W.G.W.)
| | - Corinna Franklin
- Department of Pediatric Orthopedic Surgery, Yale University School of Medicine, New Haven, CT 06520, USA;
| | - W. Geoffrey Wright
- Department of Health and Rehabilitation Sciences, College of Public Health, Temple University, Philadelphia, PA 19122, USA; (S.V.H.); (W.G.W.)
| | - Carole A. Tucker
- Department of Nutrition, Metabolism, and Rehabilitation Sciences, School of Health Professions, University of Texas Medical Branch, Galveston, TX 77555, USA;
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10
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Dugdale JH, Myers T, Sanders D, Andrew M, Clarke R, Hunter AM. Evaluation of multi-directional speed qualities throughout adolescence in youth soccer: The non-linear nature of transfer. J Sports Sci 2024; 42:301-312. [PMID: 38484363 DOI: 10.1080/02640414.2024.2329846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 03/04/2024] [Indexed: 04/23/2024]
Abstract
Training and assessment of agility is often prioritised by soccer coaches and practitioners aiming to develop multi-directional speed. Although the importance of agility is advocated throughout childhood and adolescence, limited data evidence agility performance at different stages of adolescence. The purpose of this study was to examine differences in multi-directional speed performance in youth soccer players spanning an entire soccer academy. A total of 86 male junior-elite soccer players volunteered to participate. Anthropometric data were collected, alongside performance data from a battery of physical tests including sprinting, jumping, change of direction, reaction time, and agility. Bayesian models using log-likelihoods from posterior simulations of parameter values displayed linear or curvilinear relationships between both chronological and biological age and performance in all tests other than agility and reaction time. For agility and reaction time tests, performance improved until ~14 years of age or the estimated age of peak height velocity whereby arrested development in performance was observed. Our results demonstrate that while most performance skills improve as chronological or biological age increases, measures of agility and reaction time may not. These findings support the notion that agility performance is complex and multifaceted, eliciting unique, challenging physical demands and non-linear development.
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Affiliation(s)
- James H Dugdale
- School of Applied Sciences, Edinburgh Napier University, Edinburgh, UK
| | - Tony Myers
- Sport, Physical Activity and Health Research Centre, Newman University, Birmingham, UK
| | - Dajo Sanders
- Department of Human Movement Science, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, Netherlands
| | - Matthew Andrew
- Department for Sport and Exercise Sciences, Institute of Sport, Manchester Metropolitan University, Manchester, UK
| | - Richard Clarke
- Faculty of Life Sciences and Education, University of South Wales, Wales, UK
| | - Angus M Hunter
- Department of Sport Science, Nottingham Trent University, Nottingham, UK
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, UK
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11
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Wik EH, Chamari K, Tabben M, Di Salvo V, Gregson W, Bahr R. Exploring Growth, Maturity, and Age as Injury Risk Factors in High-Level Youth Football. Sports Med Int Open 2024; 8:a21804594. [PMID: 38312925 PMCID: PMC10832576 DOI: 10.1055/a-2180-4594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 09/18/2023] [Indexed: 02/06/2024] Open
Abstract
Rapid somatic growth and biological maturity status may affect injury patterns in youth football, yet firm conclusions cannot be drawn from the existing research. We aimed to explore growth velocity, maturity, and age as injury risk factors in 95 academy players (11.9-15.0 years), using anthropometric (height and body mass), maturity (skeletal age), injury, and football exposure data collected prospectively over three seasons (2016/17-2018/19). We compared the relative quality of mixed-effects logistic regression models with growth velocity for 223 growth intervals (average 113 days) included as fixed effects and adjusted for age (chronological or skeletal) plus load (hours/week). Associations were considered practically relevant based on the confidence interval for odds ratios, using thresholds of 0.90 and 1.11 to define small beneficial and harmful effects, respectively. We observed harmful effects of older age on overall (OR: 2.61, 95% CI: 1.15-5.91) and sudden onset (1.98, 1.17-3.37) injury risk. Significant associations (p<0.05) were observed for higher body mass change and greater maturity on sudden onset injuries, and for higher hours/week on gradual onset, bone tissue, and physis injuries. Future studies should include larger samples, monitoring athletes from pre-adolescence through maturation, to enable within-subject analyses and better understand the relationship between growth, maturation, and injuries.
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Affiliation(s)
- Eirik Halvorsen Wik
- FIFA Medical Centre of Excellence, Aspetar Orthopaedic and Sports
Medicine Hospital, Doha, Qatar
- Oslo Sports Trauma Research Center, Department of Sports Medicine,
Norwegian School of Sport Sciences, Oslo, Norway
- Institute of Sport and Exercise Medicine, Department of Exercise, Sport
and Lifestyle Medicine, Faculty of Medicine and Health Sciences, Stellenbosch
University, Stellenbosch, South Africa
- Division of Physiotherapy, Department of Health and Rehabilitation
Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University,
Stellenbosch, South Africa
| | - Karim Chamari
- FIFA Medical Centre of Excellence, Aspetar Orthopaedic and Sports
Medicine Hospital, Doha, Qatar
| | - Montassar Tabben
- FIFA Medical Centre of Excellence, Aspetar Orthopaedic and Sports
Medicine Hospital, Doha, Qatar
| | - Valter Di Salvo
- Football Performance and Science Department, Aspire Academy, Doha,
Qatar
- Department of Movement, Human and Health Sciences, University of Rome
'Foro Italico', Roma, Italy
| | - Warren Gregson
- Football Performance and Science Department, Aspire Academy, Doha,
Qatar
- Department of Sport and Exercise Sciences, Institute of Sport,
Manchester Metropolitan University, Manchester, United Kingdom of Great Britain
and Northern Ireland
| | - Roald Bahr
- FIFA Medical Centre of Excellence, Aspetar Orthopaedic and Sports
Medicine Hospital, Doha, Qatar
- Oslo Sports Trauma Research Center, Department of Sports Medicine,
Norwegian School of Sport Sciences, Oslo, Norway
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12
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Monasterio X, Cumming SP, Larruskain J, Johnson DM, Gil SM, Bidaurrazaga-Letona I, Lekue JA, Diaz-Beitia G, Santisteban JM, Williams S. The combined effects of growth and maturity status on injury risk in an elite football academy. Biol Sport 2024; 41:235-244. [PMID: 38188110 PMCID: PMC10765440 DOI: 10.5114/biolsport.2024.129472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/26/2023] [Accepted: 05/18/2023] [Indexed: 01/09/2024] Open
Abstract
This study aimed to explore the interaction between growth rate on specific injury incidence and burden on pre-, circa- and post-peak height velocity (PHV) periods. Injury and stature data collected during the 2000-2020 seasons in an elite football academy were retrospectively analysed. Only players with height measurements from childhood until the attainment of adult height were included in the study (N = 84). Growth data were smoothed using a cubic spline to calculate daily growth rate and height. Growth rate was categorised into three groups: fast (> 7.2 cm/year), moderate (3.5-7.2 cm/year) and slow (< 3.5 cm/year). Percentage of observed adult height was used to classify players as pre-PHV (< 88%), circa-PHV (88-95%) or post-PHV (> 95%). Overall and specific injury incidence and burden and rate ratios for comparisons between growth rate groups were calculated on pre-, circa- and post-PHV periods, separately. Overall injury incidence and burden were greater in pre-PHV players with quicker growth rates compared to players growing moderately and slowly. All in all, players with more rapid growth-rates were at higher risk for growth-related injuries in all pre-, circa- and post-PHV periods. Post-PHV, the incidence and burden of joint/ligament injuries were 2.4 and 2.6-times greater in players growing slowly compared to players growing moderately. Practitioners should monitor growth rate and maturity status and consider their interaction to facilitate the design of targeted injury risk reduction strategies.
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Affiliation(s)
- Xabier Monasterio
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
- Medical Services, Athletic Club, Lezama, Spain
- Department for Health, University of Bath, Bath, United Kingdom
| | - Sean P Cumming
- Department for Health, University of Bath, Bath, United Kingdom
| | | | - David M Johnson
- Department for Health, University of Bath, Bath, United Kingdom
| | - Susana M Gil
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Iraia Bidaurrazaga-Letona
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Jose A Lekue
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
- Medical Services, Athletic Club, Lezama, Spain
| | - Gontzal Diaz-Beitia
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
- Medical Services, Athletic Club, Lezama, Spain
| | - Juan M Santisteban
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa, Spain
- Medical Services, Athletic Club, Lezama, Spain
| | - Sean Williams
- Department for Health, University of Bath, Bath, United Kingdom
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DeJong Lempke AF, Meehan WP, Whitney KE. Running gait adaptations among adolescent runners with soft tissue impairments following lateral ankle sprains. PM R 2023; 15:1557-1564. [PMID: 37249347 DOI: 10.1002/pmrj.13000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 04/24/2023] [Accepted: 05/01/2023] [Indexed: 05/31/2023]
Abstract
BACKGROUND Lateral ankle sprains (LAS) frequently lead to residual soft tissue impairments, often attributed to biomechanical dysfunction during movement. OBJECTIVE To compare running biomechanics between adolescent runners with soft tissue pathologies following LAS (injured) and healthy runners (control) and between limbs. DESIGN Retrospective cohort study. SETTING Hospital-affiliated sports injury prevention center. PARTICIPANTS Twenty-five adolescent runners with a history of LAS and current ankle impingement or tendinopathy (23 female, 2 male; age: 15 ± 2 years; body mass index [BMI]: 19.5 ± 2.5 kg/m2 ; symptom duration: 1.1 ± 0.9 years), and 23 healthy controls without any LAS history (19 female, 4 male; age: 15 ± 1 years; BMI: 19.2 ± 2.7 kg/m2 ) were included in this study. INTERVENTIONS All participants completed a clinical gait assessment in which they ran at a self-selected speed on a force-plate instrumented treadmill, while two video cameras recorded two-dimensional sagittal and coronal views. MAIN OUTCOME MEASURES Foot rotation, step width, contact time, and cadence were compared between groups and limbs (involved, uninvolved [or "better" for bilateral cases]) using a multivariate analysis of variance (MANOVA). Rearfoot landing and foot strike type were compared between groups and limbs using a chi-square analysis. RESULTS The injured group had significantly increased step width (F = 4.71, p = .04; mean difference [MD] with SE: 1.5 [0.7] cm) compared to controls. The injured groups' involved limb had longer contact time (F = 4.62, p = .03; MDgroup : 12 [7] ms, MDlimb : 22 [11] ms) with more internal foot rotation (F = 14.60, p < .001; MDgroup : 2.2 [1.2] degrees, MDlimb : 4.2 [1.3] degrees) compared to controls and their contralateral limb. There were no significant differences for cadence (F = 2.43, p = .13; MD: 4 [3] steps/min), foot landing (X2 = 1.28, p = .53), or foot strike (X2 = 1.24, p = .54). CONCLUSIONS Spatiotemporal and kinematic running adaptations may predispose young runners with initial LAS to secondary soft tissue dysfunction due to loss of stability from ligamentous structures and an overreliance on myotendinous control. Clinicians may consider targeting these maladaptations during gait-training interventions.
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Affiliation(s)
| | - William P Meehan
- Micheli Center for Sports Injury Prevention, Waltham, Massachusetts, USA
- Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, Massachusetts, USA
- Harvard Medical School, Boston, Massachusetts, USA
| | - Kristin E Whitney
- Micheli Center for Sports Injury Prevention, Waltham, Massachusetts, USA
- Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, Massachusetts, USA
- Harvard Medical School, Boston, Massachusetts, USA
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14
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DeJong Lempke AF, Hunt DL, Dawkins C, Stracciolini A, Kocher MS, d'Hemecourt PA, Whitney KE. Adolescent and young adult hip and knee strength profiles relate to running gait biomechanics. Phys Ther Sport 2023; 64:48-54. [PMID: 37741000 DOI: 10.1016/j.ptsp.2023.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/25/2023]
Abstract
OBJECTIVES Compare and assess relationships between strength and running biomechanics among healthy adolescents and young adult males and females. DESIGN Retrospective cohort. SETTING Clinic. PARTICIPANTS 802 healthy participants (570 F, 232 M; 16.6 ± 2.3 years). MAIN OUTCOME MEASURES Mass-normalized knee flexor and extensor strength, hip adductor and abductor strength, hamstrings-to-quadriceps (H:Q), and abductor-to-adductor (Abd:Add) ratios were obtained using hand-held dynamometry. Mass-normalized peak vertical ground reaction force (vGRF), %stance, cadence, and stride length were obtained using an instrumented treadmill. Multivariate analyses of variance were used to compare strength and biomechanics across ages and sexes. Linear regressions were used to assess the relationships between strength and biomechanics, accounting for speed, age, and sex. Independent t-tests were used to compare strength between strength ratio profiles. RESULTS Strength and running biomechanics significantly differed between sexes (p-range: <0.001-0.05) and age groups (p-range: <0.001-0.02). Strength and strength ratios were significantly associated with increased cadence (p-range:0.001-0.04) and stride lengths (p-range:0.004-0.03), and decreased vGRF (p < 0.001). Lower H:Q ratios had significantly lower strength measures (p < 0.001). Higher Abd:Add ratios had significantly increased abductor strength (p < 0.001). CONCLUSIONS Strength and running biomechanics differed by sexes and ages. Hip and knee strength and strength ratios were related to select spatiotemporal and kinetic biomechanical features.
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Affiliation(s)
- Alexandra F DeJong Lempke
- School of Kinesiology, University of Michigan, Ann Arbor, 830 N University Ave, Ann Arbor, MI, 48109, USA.
| | - Danielle L Hunt
- Micheli Center for Sports Injury Prevention, 20 Hope Avenue, Waltham, MA, 02453, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, 319 Longwood Avenue, 20115, Boston, MA, USA
| | - Corey Dawkins
- Micheli Center for Sports Injury Prevention, 20 Hope Avenue, Waltham, MA, 02453, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, 319 Longwood Avenue, 20115, Boston, MA, USA
| | - Andrea Stracciolini
- Micheli Center for Sports Injury Prevention, 20 Hope Avenue, Waltham, MA, 02453, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, 319 Longwood Avenue, 20115, Boston, MA, USA; Harvard Medical School, 319 Longwood Avenue, Boston, MA, 20115, USA
| | - Mininder S Kocher
- Micheli Center for Sports Injury Prevention, 20 Hope Avenue, Waltham, MA, 02453, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, 319 Longwood Avenue, 20115, Boston, MA, USA; Harvard Medical School, 319 Longwood Avenue, Boston, MA, 20115, USA
| | - Pierre A d'Hemecourt
- Micheli Center for Sports Injury Prevention, 20 Hope Avenue, Waltham, MA, 02453, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, 319 Longwood Avenue, 20115, Boston, MA, USA; Harvard Medical School, 319 Longwood Avenue, Boston, MA, 20115, USA
| | - Kristin E Whitney
- Micheli Center for Sports Injury Prevention, 20 Hope Avenue, Waltham, MA, 02453, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, 319 Longwood Avenue, 20115, Boston, MA, USA; Harvard Medical School, 319 Longwood Avenue, Boston, MA, 20115, USA
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15
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Fallon Verbruggen F, Kaľata M, Marenčáková J, Malý T, Zahálka F. The effect of biological maturation on foot morphology, and their relation to postural stability performance in male footballers. J Sports Med Phys Fitness 2023; 63:1155-1164. [PMID: 37535341 DOI: 10.23736/s0022-4707.23.15037-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
BACKGROUND Biological maturity (BM) and foot morphology (FM) can independently alter neuromuscular loading on the ankle-foot complex, potentially causing stability deficits and injury predisposition. However, the influence of BM on FM, and how much both explain neuromuscular performance in postural stability (PS) tests, has been understudied. This study aimed to investigate the effect of BM on FM, and then discover to what extent both factors explain the variance in PS performance in adolescent footballers. METHODS Over one season, 399 three-dimensional foot scans were gathered from 72 footballers (U12-U15). PS was measured by center of pressure (COP) displacement in bilateral and unilateral stance. The Khamis and Roche equation determined maturity status (MS), while formulae from Mirwald and Khamis and Roche estimated timing of biological maturation (TBM). Principal component analysis determined nine principal components that explained the most variance in FM. An ANCOVA determined the effect of TBM on FM principal components, with covariates of age, height, weight, playing position, and foot preference. Step-wise linear regression determined the explanation of COP displacement by the above-mentioned predictors. RESULTS There was significantly increased foot pronation during and after peak height velocity/puberty. MS and four foot principal components (foot arch and width, great toe width and length) were significant predictors in all PS tests (R2: 0.105-0.180). CONCLUSIONS TBM had a significant effect on FM presentation, and should be a part of adolescent foot assessment. While they only explained a small amount of variance, determining MS and FM may identify those requiring additional PS attention.
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Affiliation(s)
- Ferdia Fallon Verbruggen
- Sport Research Center, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic -
| | - Maroš Kaľata
- Sport Research Center, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic
| | - Jitka Marenčáková
- Sport Research Center, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic
| | - Tomáš Malý
- Sport Research Center, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic
| | - František Zahálka
- Sport Research Center, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic
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16
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Burton AM, Cowburn I, Thompson F, Eisenmann JC, Nicholson B, Till K. Associations Between Motor Competence and Physical Activity, Physical Fitness and Psychosocial Characteristics in Adolescents: A Systematic Review and Meta-analysis. Sports Med 2023; 53:2191-2256. [PMID: 37542607 PMCID: PMC10587315 DOI: 10.1007/s40279-023-01886-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/23/2023] [Indexed: 08/07/2023]
Abstract
BACKGROUND Motor competence is an integral component of the health and performance of youth. Numerous studies support the hypothesis that motor competence interacts with perceived motor competence and physical fitness during childhood to induce positive (e.g. healthy weight status) or negative (e.g. reduced physical activity engagement) trajectories. Yet, while adolescence is a key period of rapid growth and maturation, no systematic reviews and meta-analyses have examined the association between motor competence and physical activity, physical fitness and psychosocial characteristics solely within adolescents. OBJECTIVES This study aimed to (1) analyse the scientific literature evaluating associations between motor competence and physical activity, physical fitness and/or psychosocial characteristics amongst adolescents; (2) evaluate the associations between motor competence and physical activity, physical fitness characteristics and/or psychosocial characteristics amongst adolescents; and (3) investigate the impact of moderator variables (i.e., age, sex, type of motor competence assessment) on the associations. METHODS A systematic search of electronic databases was conducted, followed by a qualitative synthesis of study methods. Random-effects meta-analyses were performed to establish the magnitude and orientation of pooled correlation coefficients between motor competence and physical activity, physical fitness and psychosocial characteristics of adolescents, whilst considering potential moderators (i.e., age, sex, type of motor competence assessment). RESULTS Sixty-one studies were included, totalling 22,256 adolescents. Twenty-seven different assessments of motor competence were used, with 31 studies utilising product-orientated (i.e. outcome) motor competence assessments. Meta-analyses of 43 studies showed that motor competence was positively associated with physical activity (r = 0.20 to 0.26), some physical fitness characteristics (e.g. muscular strength, cardiovascular endurance; r = 0.03 to 0.60) and psychosocial characteristics (r = 0.07 to 0.34), and inversely associated with weight status (r = - 0.36 to - 0.10), speed (r = - 0.31) and agility (r = - 0.37 to 0.41). Associations with flexibility were unclear. CONCLUSIONS The results of this systematic review and meta-analysis support the hypothesised interactions of motor competence with physical activity (positive), physical fitness (positive except for weight status, speed and agility) and psychosocial characteristics (positive) in adolescence. However, methodological approaches vary considerably (e.g. variety of motor competence assessments utilised), with limitations of the current literature including an inadequate assessment of motor competence, a lack of longitudinal observations and a failure to account for biological maturation. Future research assessing associations between motor competence and physical activity, physical fitness and psychosocial characteristics of adolescents should include longitudinal observations of a combined motor competence assessment (i.e. process and product) and account for biological maturation. Improved evaluation using these recommendations could provide more accurate data, leading to more targeted interventions to improve adolescents' physical and psychosocial outcomes. CLINICAL TRIAL REGISTRATION CRD42021233441 (PROSPERO ID).
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Affiliation(s)
- Alan M Burton
- Research Centre for Sports Coaching, Carnegie School of Sport, Leeds Beckett University, Headingley Campus, Churchwood Avenue, Leeds, LS26 3QT, UK.
- Queen Ethelburga's Collegiate, York, UK.
| | - Ian Cowburn
- Research Centre for Sports Coaching, Carnegie School of Sport, Leeds Beckett University, Headingley Campus, Churchwood Avenue, Leeds, LS26 3QT, UK
| | - Ffion Thompson
- Research Centre for Sports Coaching, Carnegie School of Sport, Leeds Beckett University, Headingley Campus, Churchwood Avenue, Leeds, LS26 3QT, UK
- Queen Ethelburga's Collegiate, York, UK
| | - Joey C Eisenmann
- Research Centre for Sports Coaching, Carnegie School of Sport, Leeds Beckett University, Headingley Campus, Churchwood Avenue, Leeds, LS26 3QT, UK
- Lakeland University, Plymouth, WI, USA
| | - Ben Nicholson
- Research Centre for Sports Coaching, Carnegie School of Sport, Leeds Beckett University, Headingley Campus, Churchwood Avenue, Leeds, LS26 3QT, UK
| | - Kevin Till
- Research Centre for Sports Coaching, Carnegie School of Sport, Leeds Beckett University, Headingley Campus, Churchwood Avenue, Leeds, LS26 3QT, UK
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17
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Arenas L, Frenger M, Skorski S, Meyer T. Survey of the current practices of German football academies towards biological maturation assessment. SCI MED FOOTBALL 2023:1-14. [PMID: 37840319 DOI: 10.1080/24733938.2023.2270563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/05/2023] [Indexed: 10/17/2023]
Abstract
OBJECTIVES This study aimed to examine the importance assigned to assessing and considering biological maturation in thematic areas of player development and provide an overview of current practices in German football academies regarding its consideration in training and competition. METHODS An online survey was sent to 56 elite German football academies. A total of 46 responded to the questionnaire (82% response rate). Six participants provided incomplete information resulting in a total of 40 completed surveys in the period from March to May 2022. RESULTS Only 20 of participants regularly carried out maturation assessments, despite 95% recognizing its importance for load management, 90% for player development, and 85% for injury prevention. There was no consistent approach to modifying training and competition formats based on maturity status, with a primary focus on gym-based sessions for load management. CONCLUSION The survey results highlight limited implementation of maturation assessment and training modification based on maturity status in German elite youth football academies. Despite recognizing the importance of load monitoring, reporting to parents, and long-term player development in considering biological maturation, practices are not widespread. The predominant use of the maturity offset method suggests an opportunity to improve accuracy by exploring alternative measurement methods and increasing assessment frequency. Moreover, a lack of established procedures for incorporating maturity status into training and competition exists, hindering comprehensive consideration of biological maturation and injury risk prevention. Further research is needed to understand the reasons for inconsistent approaches in maturation assessment and load modification during training and competition.
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Affiliation(s)
- Lukas Arenas
- Institute of Sport and Preventive Medicine, Saarland University, Saarbrücken, Germany
| | - Monika Frenger
- Department Economics and Sociology of Sport, Saarland University, Saarbrücken, Germany
| | - Sabrina Skorski
- Institute of Sport and Preventive Medicine, Saarland University, Saarbrücken, Germany
| | - Tim Meyer
- Institute of Sport and Preventive Medicine, Saarland University, Saarbrücken, Germany
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18
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Thieschäfer L, Klütz J, Weig J, Dos’Santos T, Büsch D. Development of a Cutting Technique Modification Training Program and Evaluation of its Effects on Movement Quality and Cutting Performance in Male Adolescent American Football Players. Sports (Basel) 2023; 11:184. [PMID: 37755861 PMCID: PMC10534889 DOI: 10.3390/sports11090184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/11/2023] [Accepted: 09/13/2023] [Indexed: 09/28/2023] Open
Abstract
This study developed a cutting technique modification training program and investigated its effects on cutting performance and movement quality in adolescent American football players. For six weeks, an intervention group (IG) of 11 players participated in 25 min cutting technique modification training sessions integrated into team training twice a week, while a control group (CG) of 11 players continued their usual team training. Movement quality was assessed by evaluating 2D high-speed videos, obtained during preplanned 45° and 90° cutting tests, using the Cutting Movement Assessment Score (CMAS) qualitative screening tool. Cutting performance was assessed based on change of direction deficit (CODD). Significant interaction effects of time × group were found for CMAS in 45° and 90° cuttings (p < 0.001, ηp2 = 0.76, p < 0.001, ηp2 = 0.64, respectively), with large improvements in the IG (p < 0.001, g = -2.16, p < 0.001, g = -1.78, respectively) and deteriorations in the CG for 45° cuttings (p = 0.002, g = 1.15). However, no statistically significant differences in CODD were observed pre-to-post intervention. The cutting technique modification training was effective at improving movement quality without impairing cutting performance, and it can be used by practitioners working with adolescent athletes.
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Affiliation(s)
- Lutz Thieschäfer
- Institute of Sport Science, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany (D.B.)
| | - Julius Klütz
- Institute of Sport Science, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany (D.B.)
| | - Julian Weig
- Institute of Sport Science, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany (D.B.)
| | - Thomas Dos’Santos
- Department of Sport and Exercise Sciences, Musculoskeletal Science and Sports Medicine Research Centre, Manchester Metropolitan University, Manchester M1 7EL, UK;
- Manchester Institute of Sport, Manchester Metropolitan University, Manchester M1 7EL, UK
| | - Dirk Büsch
- Institute of Sport Science, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany (D.B.)
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19
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Gonzalo-Skok O, Bishop C. Change of direction speed and deficit over single and multiple changes of direction: Influence of biological age in youth basketball players. J Sports Sci 2023; 41:1490-1497. [PMID: 37943988 DOI: 10.1080/02640414.2023.2279817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 10/29/2023] [Indexed: 11/12/2023]
Abstract
The study analysed the difference in change of direction (COD) deficit among young male basketball players of different age groups and biological ages and analysed the relationships in COD performance (time and deficit) across single and multiple CODs depending on their biological age. Fifty-four highly-trained male players (U-13 and U-17) were tested on sprinting (25-m) and COD ability over single and multiple CODs through total times and the percentage-based COD deficit (CODD). Results showed that older age groups performed significantly (ES = 0.43-2.32, p < 0.05) better in linear and COD times, especially those players with post-peak height velocity (PHV) (ES = 0.89-1.90). Controlling for age at PHV, no significant differences were found in any group or inter-limb asymmetries. Moderate relationships were found between CODD in the pool data (r = 0.36 to 0.50). All CODD and time relationships in any test (i.e., 180º COD and V-cut) were considerably lower (r= -0.27 to 0.32) across individual biological groups. The study highlights the impact of maturation on COD performance, whereas CODD seems to be not affected. Interestingly, the CODD is independent, highlighting this measurement's specific nature. Practitioners should use common distances, angles, and the number of CODs linked to biological status to create a COD profile.
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Affiliation(s)
- Oliver Gonzalo-Skok
- Department of Communication and Education, Universidad Loyola Andalucía, Seville, Spain
| | - Chris Bishop
- London Sport Institute, School of Science and Technology, Middlesex University, London, UK
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20
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Zhao D, Pan JK, Lin FZ, Luo MH, Liang GH, Zeng LF, Huang HT, Han YH, Xu NJ, Yang WY, Liu J. Risk Factors for Revision or Rerupture After Anterior Cruciate Ligament Reconstruction: A Systematic Review and Meta-analysis. Am J Sports Med 2023; 51:3053-3075. [PMID: 36189967 DOI: 10.1177/03635465221119787] [Citation(s) in RCA: 26] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND The rerupture or need for revision after anterior cruciate ligament reconstruction (ACLR) is a serious complication. Preventive strategies that target the early identification of risk factors are important to reduce the incidence of additional surgery. PURPOSE To perform a systematic review and meta-analysis to investigate risk factors for revision or rerupture after ACLR. STUDY DESIGN Systematic review and meta-analysis; Level of evidence, 4. METHODS Literature searches were performed in PubMed, Embase, and Web of Science from database inception to November 2021 and updated in January 2022. Quantitative, original studies reporting potential adjusted risk factors were included. Odds ratios (ORs) were calculated for potential risk factors. RESULTS A total of 71 studies across 13 countries with a total sample size of 629,120 met the inclusion criteria. Fifteen factors were associated with an increase in the risk of revision or rerupture after ACLR: male sex (OR, 1.27; 95% CI, 1.14-1.41), younger age (OR, 1.07; 95% CI, 1.05-1.08), lower body mass index (BMI) (OR, 1.03; 95% CI, 1.00-1.06), family history (OR, 2.47; 95% CI, 1.50-4.08), White race (OR, 1.32; 95% CI, 1.08-1.60), higher posterolateral tibial slope (OR, 1.15; 95% CI, 1.05-1.26), preoperative high-grade anterior knee laxity (OR, 2.30; 95% CI, 1.46-3.64), higher baseline Marx activity level (OR, 1.07; 95% CI, 1.02-1.13), return to a high activity level/sport (OR, 2.03; 95% CI, 1.15-3.57), an ACLR within less than a year after injury (OR, 2.05; 95% CI, 1.81-2.32), a concomitant medial collateral ligament (MCL) injury (OR, 1.62; 95% CI, 1.31-2.00), an anteromedial portal or transportal technique (OR, 1.36; 95% CI, 1.22-1.51), hamstring tendon (HT) autografts (vs bone-patellar tendon-bone [BPTB] autografts) (OR, 1.60; 95% CI, 1.40-1.82), allografts (OR, 2.63; 95% CI, 1.65-4.19), and smaller graft diameter (OR, 1.21; 95% CI, 1.05-1.38). The other factors failed to show an association with an increased risk of revision or rerupture after ACLR. CONCLUSION Male sex, younger age, lower BMI, family history, White race, higher posterolateral tibial slope, preoperative high-grade anterior knee laxity, higher baseline Marx activity level, return to a high activity level/sport, an ACLR within less than a year from injury, a concomitant MCL injury, an anteromedial portal or transportal technique, HT autografts (vs BPTB autografts), allografts, and smaller graft diameter may increase the risk of revision or rerupture after ACLR. Raising awareness and implementing effective preventions/interventions for risk factors are priorities for clinical practitioners to reduce the incidence of revision or rerupture after ACLR.
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Affiliation(s)
- Di Zhao
- The Second Clinical School of Guangzhou University of Chinese Medicine, Guangzhou, China
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
| | - Jian-Ke Pan
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Fang-Zheng Lin
- The Second Clinical School of Guangzhou University of Chinese Medicine, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ming-Hui Luo
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Gui-Hong Liang
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ling-Feng Zeng
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - He-Tao Huang
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yan-Hong Han
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Nan-Jun Xu
- The Second Clinical School of Guangzhou University of Chinese Medicine, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Wei-Yi Yang
- Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jun Liu
- Department of Sports Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
- Guangdong Second Traditional Chinese Medicine Hospital (Guangdong Province Engineering Technology Research Institute of Traditional Chinese Medicine), Guangzhou, China
- The Fifth Clinical Medical College of Guangzhou University of Chinese Medicine, Guangzhou, China
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Kim J, McSweeney SC, Hollander K, Horstman T, Wearing SC. Adolescents running in conventional running shoes have lower vertical instantaneous loading rates but greater asymmetry than running barefoot or in partial-minimal shoes. J Sports Sci 2023; 41:774-787. [PMID: 37571975 DOI: 10.1080/02640414.2023.2240174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 07/17/2023] [Indexed: 08/13/2023]
Abstract
Footwear may moderate the transiently heightened asymmetry in lower limb loading associated with peak growth in adolescence during running. This repeated-measures study compared the magnitude and symmetry of peak vertical ground reaction force and instantaneous loading rates (VILRs) in adolescents during barefoot and shod running. Ten adolescents (age, 10.6 ± 1.7 years) ran at self-selected speed (1.7 ± 0.3 m/s) on an instrumented treadmill under three counter-balanced conditions; barefoot and shod with partial-minimal and conventional running shoes. All participants were within one year of their estimated peak height velocity based on sex-specific regression equations. Foot-strike patterns, peak vertical ground reaction force and VILRs were recorded during 20 seconds of steady-state running. Symmetry of ground reaction forces was assessed using the symmetry index. Repeated-measures ANOVAs were used to compare conditions (α=.05). Adolescents used a rearfoot foot-strike pattern during barefoot and shod running. Use of conventional shoes resulted in a lower VILR (P < .05, dz = 0.9), but higher VILR asymmetry (P < .05) than running barefoot (dz = 1.5) or in partial-minimal shoes (dz = 1.6). Conventional running shoes result in a lower VILR than running unshod or in partial-minimal shoes but may have the unintended consequence of increasing VILR asymmetry. The findings may have implications for performance, musculoskeletal development and injury in adolescents.
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Affiliation(s)
- Jae Kim
- Complete Rehab Allied Health Clinic, Brisbane, Australia
| | - Simon C McSweeney
- School of Clinical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Karsten Hollander
- Institute of Exercise Science & Sports Medicine, Medical School Hamburg, Hamburg, Germany
| | - Thomas Horstman
- Conservative and Rehabilitative Orthopaedics, Technical University Munich, Munich, Germany
| | - Scott C Wearing
- Conservative and Rehabilitative Orthopaedics, Technical University Munich, Munich, Germany
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22
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Đolo K, Grgantov Z, Kuvačić G. New Specific Kinesthetic Differentiation Tests for Female Volleyball Players: Reliability, Discriminative Ability, and Usefulness. J Funct Morphol Kinesiol 2023; 8:jfmk8020063. [PMID: 37218859 DOI: 10.3390/jfmk8020063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/08/2023] [Accepted: 05/09/2023] [Indexed: 05/24/2023] Open
Abstract
This study aimed to determine the test-retest reliability and discriminative ability of five sport-specific kinesthetic differentiation ability tests in female volleyball players. The sample of participants consisted of 98 female volleyball players aged 15.20 ± 1 years from six clubs in Bosnia and Herzegovina. Kinesthetic differentiation ability was determined by the overhead passing test, forearm passing test, float service with a net test, float service without a net test, and float service 6 m from the net test. To estimate test-retest reliability, a sub-sample of 13 players performed all tests on two testing occasions. Furthermore, the discriminative ability of the tests was determined by analyzing the performance between players of different playing positions and situational performances. Parameters of the intraclass correlation coefficient (ICC) were excellent (0.87-0.78) in all tests except for the float service with the net test, whose reliability was good (0.66). For the absolute reliability estimates, the SEM was higher than SWC (0.2) for all variables except the float service 6 m from the net test, and the SEM was lower than SWC (0.6, 1.2). One-way ANOVA detected no statistically significant inter-positional differences in all five tests (p > 0.05). A significant difference was found between less and more successful players (p < 0.01) for all applied tests. The results of this study show that a specific battery test is a reliable and valid measure and can be used to monitor kinesthetic differentiation ability in young female volleyball players.
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Affiliation(s)
- Karla Đolo
- Faculty of Kinesiology, University of Split, 21000 Split, Croatia
| | - Zoran Grgantov
- Faculty of Kinesiology, University of Split, 21000 Split, Croatia
| | - Goran Kuvačić
- Faculty of Kinesiology, University of Split, 21000 Split, Croatia
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23
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Radnor JM, Oliver JL, Dobbs I, Wong M, Brown TW, Lloyd RS, Kelly AL. Selection into youth cricket academies: The influence of relative age and maturity status. J Sports Sci 2023; 41:272-279. [PMID: 37163466 DOI: 10.1080/02640414.2023.2208924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The aim of the study was to examine the birth quartile and maturity status distributions of male academy cricketers. Participants included 213 junior cricket players, aged between 9 and 18 years. Players were separated into birth quartiles and also grouped as early, average or late maturers. For the whole cohort, there was a medium effect bias towards players born in BQ1, but the number of early, average and late maturers was as expected. However, there were significantly more early maturers in the U10 and U11 groups than expected, and maturity distributions of the BQ groups showed that there was a small effect size bias towards early maturers in BQ4. Selection biases towards cricketers who are born earlier in the competitive year are consistent from U9 to U16, but more prevalent in the U12 and U14 age groups. There is a bias towards early maturers at U10 and U11, but this reduces as age increases. Practitioners working in academy pathways should be encouraged to assess the maturity status of players to assist in the retention and progression of players. Relative age effects should also be considered, and strategies may be required to identify players born later in the year.
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Affiliation(s)
- John M Radnor
- Youth Physical Development Centre, School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - Jon L Oliver
- Youth Physical Development Centre, School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
- Sport Performance Research Institute New Zealand, AUT University, Auckland, New Zealand
| | - Ian Dobbs
- Youth Physical Development Centre, School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - Megan Wong
- Youth Physical Development Centre, School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - Thomas W Brown
- Centre for Life and Sport Science (C-LaSS), Faculty of Health, Education and Life Sciences, Birmingham City University, Birmingham, UK
- Warwickshire County Cricket Club, Birmingham, UK
| | - Rhodri S Lloyd
- Youth Physical Development Centre, School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
- Sport Performance Research Institute New Zealand, AUT University, Auckland, New Zealand
- Centre for Sport Science and Human Performance, Waikato Institute of Technology, Hamilton, New Zealand
| | - Adam L Kelly
- Centre for Life and Sport Science (C-LaSS), Faculty of Health, Education and Life Sciences, Birmingham City University, Birmingham, UK
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Choi YJ, Chalatzoglidis G, Trapezanidou M, Delmas S, Savva E, Yacoubi B, Arabatzi F, Christou EA. Adolescent boys who participate in sports exhibit similar ramp torque control with young men despite differences in strength and tendon characteristics. Eur J Appl Physiol 2023; 123:965-974. [PMID: 36607415 PMCID: PMC10718087 DOI: 10.1007/s00421-022-05130-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 12/26/2022] [Indexed: 01/07/2023]
Abstract
PURPOSE The goal of this paper was to determine if sports participation influences torque control differently for adolescent boys and young men during a slow ramp task. METHODS Twenty-one adolescent boys (11 athletes) and 31 young men (16 athletes) performed a slow ramp increase in plantar flexion torque from 0 to maximum. We quantified torque control as the coefficient of variation (CV) of torque during the ramp and quantified the Achilles tendon mechanical properties using ultrasonography. RESULTS Relative to adolescent boys, young men were taller, heavier, stronger, and had a longer and stiffer Achilles tendon. However, these characteristics were not different between athletes and non-athletes in adolescent boys. For the CV of torque, there was a significant interaction with sports participation, indicating that only adolescent boys who were non-athletes had greater variability than young men. The CV of torque of all participants was predicted from the maximum torque and torque oscillations from 1 to 2 Hz, whereas the CV of torque for adolescent boys was predicted only from torque oscillations from 1 to 2 Hz. CONCLUSION These findings suggested that adolescent boys who participate in sports exhibited lower torque variability during a slow ramp task, which was not explained by differences in Achilles tendon properties or strength.
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Affiliation(s)
- Yoon Jin Choi
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, 32611-8205, USA
| | - George Chalatzoglidis
- Laboratory of Neuromechanics, Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Martha Trapezanidou
- Laboratory of Neuromechanics, Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Stefan Delmas
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, 32611-8205, USA
| | - Evangelia Savva
- Laboratory of Neuromechanics, Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Basma Yacoubi
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, 32611-8205, USA
| | - Fotini Arabatzi
- Laboratory of Neuromechanics, Department of Physical Education and Sports Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Evangelos A Christou
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, 32611-8205, USA.
- Department of Neurology, Fixel Institute for Neurological Diseases, University of Florida, Gainesville, FL, USA.
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25
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Takei S, Torii S, Taketomi S, Iizuka S, Tojima M, Iwanuma S, Iida Y, Tanaka S. Developmental stage and lower quadriceps flexibilities and decreased gastrocnemius flexibilities are predictive risk factors for developing Osgood-Schlatter disease in adolescent male soccer players. Knee Surg Sports Traumatol Arthrosc 2023:10.1007/s00167-023-07378-z. [PMID: 37002485 DOI: 10.1007/s00167-023-07378-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 03/01/2023] [Indexed: 06/19/2023]
Abstract
PURPOSE This study aimed to elucidate the influential predictive risk factors of Osgood-Schlatter disease (OSD) on the support (non-kicking) leg among adolescent soccer players considering peak height velocity (PHV) age and investigate the cut-off values of the predictive variables. METHODS A cohort of 302 Japanese adolescent male soccer players aged 12-13 years were followed over 6 months. All players underwent physical examination, tibial tubercle ultrasonography, anthropometric and whole-body composition measurements, and muscle flexibility test of the support leg at the baseline. The developmental stage was evaluated from the PHV age. The OSD of the support leg was diagnosed 6 months later; players were divided into the OSD and control (CON) groups. The predictive risk factors were analyzed by multivariate logistic regression analysis. RESULTS There were 42 players who had developed OSD at baseline and they were excluded from the study. Among the 209 players, 43 and 166 belonged to the OSD and CON groups, respectively. The predictive risk factors of OSD development were PHV age ± 6 months at baseline (p = 0.046), apophyseal stage of tibial tuberosity maturity at baseline (p < 0.001), quadriceps flexibility ≥ 35° at baseline (p = 0.017), and decrease in gastrocnemius flexibility in 6 months (p = 0.009). CONCLUSION PHV age ± 6 months at baseline, apophyseal stage of the tibial tuberosity at baseline, quadriceps flexibility ≥ 35° at baseline, and decrease in gastrocnemius flexibility in 6 months are predictive risk factors of OSD development in the support leg among adolescent male soccer players. It is crucial to know the PHV age of each player, and not only the flexibility of quadriceps muscle but also the gastrocnemius should be monitored to predict OSD. LEVEL OF EVIDENCE II.
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Affiliation(s)
- Seira Takei
- Department of Orthopaedic Surgery, Sensory and Motor System Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Waseda Institute of Human Growth and Development, Saitama, Japan
| | - Suguru Torii
- Waseda Institute of Human Growth and Development, Saitama, Japan.
- Faculty of Sport Sciences, Waseda University, Saitama, Japan.
| | - Shuji Taketomi
- Department of Orthopaedic Surgery, Sensory and Motor System Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | | | - Michio Tojima
- School of Health Sciences, Tokyo International University, Saitama, Japan
| | - Soichiro Iwanuma
- Department of School Education, Teikyo University of Science, Tokyo, Japan
| | - Yukako Iida
- Waseda Institute of Human Growth and Development, Saitama, Japan
- Faculty of Sport Science, Surugadai University, Saitama, Japan
| | - Sakae Tanaka
- Department of Orthopaedic Surgery, Sensory and Motor System Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Comfort P, Haff GG, Suchomel TJ, Soriano MA, Pierce KC, Hornsby WG, Haff EE, Sommerfield LM, Chavda S, Morris SJ, Fry AC, Stone MH. National Strength and Conditioning Association Position Statement on Weightlifting for Sports Performance. J Strength Cond Res 2023; 37:1163-1190. [PMID: 36952649 DOI: 10.1519/jsc.0000000000004476] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
ABSTRACT Comfort, P, Haff, GG, Suchomel, TJ, Soriano, MA, Pierce, KC, Hornsby, WG, Haff, EE, Sommerfield, LM, Chavda, S, Morris, SJ, Fry, AC, and Stone, MH. National Strength and Conditioning Association position statement on weightlifting for sports performance. J Strength Cond Res XX(X): 000-000, 2022-The origins of weightlifting and feats of strength span back to ancient Egypt, China, and Greece, with the introduction of weightlifting into the Olympic Games in 1896. However, it was not until the 1950s that training based on weightlifting was adopted by strength coaches working with team sports and athletics, with weightlifting research in peer-reviewed journals becoming prominent since the 1970s. Over the past few decades, researchers have focused on the use of weightlifting-based training to enhance performance in nonweightlifters because of the biomechanical similarities (e.g., rapid forceful extension of the hips, knees, and ankles) associated with the second pull phase of the clean and snatch, the drive/thrust phase of the jerk and athletic tasks such as jumping and sprinting. The highest force, rate of force development, and power outputs have been reported during such movements, highlighting the potential for such tasks to enhance these key physical qualities in athletes. In addition, the ability to manipulate barbell load across the extensive range of weightlifting exercises and their derivatives permits the strength and conditioning coach the opportunity to emphasize the development of strength-speed and speed-strength, as required for the individual athlete. As such, the results of numerous longitudinal studies and subsequent meta-analyses demonstrate the inclusion of weightlifting exercises into strength and conditioning programs results in greater improvements in force-production characteristics and performance in athletic tasks than general resistance training or plyometric training alone. However, it is essential that such exercises are appropriately programmed adopting a sequential approach across training blocks (including exercise variation, loads, and volumes) to ensure the desired adaptations, whereas strength and conditioning coaches emphasize appropriate technique and skill development of athletes performing such exercises.
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Affiliation(s)
- Paul Comfort
- University of Salford, Greater Manchester, United Kingdom
- Edith Cowan University, Perth, Australia
| | - G Gregory Haff
- University of Salford, Greater Manchester, United Kingdom
- Edith Cowan University, Perth, Australia
| | - Timothy J Suchomel
- University of Salford, Greater Manchester, United Kingdom
- Carroll University, Waukesha, Wisconsin
| | | | | | | | - Erin E Haff
- University of Salford, Greater Manchester, United Kingdom
- Australian Weightlifting Federation, Chandler, Australia
| | | | - Shyam Chavda
- London Sports Institute, Middlesex University, London, United Kingdom
- British Weightlifting, Leeds, United Kingdom
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Sudlow A, Galantine P, Vercruyssen F, Peyrot N, Raymond JJ, Duché P. Which Factors Influence Running Gait in Children and Adolescents? A Narrative Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:ijerph20054621. [PMID: 36901631 PMCID: PMC10001902 DOI: 10.3390/ijerph20054621] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 02/23/2023] [Accepted: 03/03/2023] [Indexed: 06/01/2023]
Abstract
In recent years, running has dramatically increased in children and adolescents, creating a need for a better understanding of running gait in this population; however, research on this topic is still limited. During childhood and adolescence multiple factors exist that likely influence and shape a child's running mechanics and contribute to the high variability in running patterns. The aim of this narrative review was to gather together and assess the current evidence on the different factors that influence running gait throughout youth development. Factors were classified as organismic, environmental, or task-related. Age, body mass and composition, and leg length were the most researched factors, and all evidence was in favour of an impact on running gait. Sex, training, and footwear were also extensively researched; however, whereas the findings concerning footwear were all in support of an impact on running gait, those concerning sex and training were inconsistent. The remaining factors were moderately researched with the exception of strength, perceived exertion, and running history for which evidence was particularly limited. Nevertheless, all were in support of an impact on running gait. Running gait is multifactorial and many of the factors discussed are likely interdependent. Caution should therefore be taken when interpreting the effects of different factors in isolation.
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Affiliation(s)
- Anthony Sudlow
- Impact of Physical Activity on Health Research Unit, Faculty of Sport Sciences, University of Toulon, Campus La Garde, 83160 Toulon, France
| | - Paul Galantine
- Impact of Physical Activity on Health Research Unit, Faculty of Sport Sciences, University of Toulon, Campus La Garde, 83160 Toulon, France
| | - Fabrice Vercruyssen
- Impact of Physical Activity on Health Research Unit, Faculty of Sport Sciences, University of Toulon, Campus La Garde, 83160 Toulon, France
| | - Nicolas Peyrot
- Mouvement-Interactions-Performance, MIP, UR 4334, Faculty of Sport Sciences, Le Mans University, 72000 Le Mans, France
| | - Jean-Jacques Raymond
- Impact of Physical Activity on Health Research Unit, Faculty of Sport Sciences, University of Toulon, Campus La Garde, 83160 Toulon, France
- Unité de Médecine et de traumatologie du Sport, CHITS Hôpital Sainte Musse, 83100 Toulon, France
| | - Pascale Duché
- Impact of Physical Activity on Health Research Unit, Faculty of Sport Sciences, University of Toulon, Campus La Garde, 83160 Toulon, France
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Villarón-Casales C, Aladro-Gonzalvo AR, Gámez-Payá J, Pardo-Ibáñez A, Domínguez-Navarro F, Gallego D, Alarcón-Jimenez J. Static Postural Control during Single-Leg Stance in Endurance, Team and Combat Athletes from the Spanish National Sport Technification Program. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:4292. [PMID: 36901298 PMCID: PMC10001565 DOI: 10.3390/ijerph20054292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 06/18/2023]
Abstract
In the context of pediatric physical exercise, the analysis of factors affecting postural control (PC) provides insight into the development of sport-specific motor skills. This study aims to evaluate the static PC during single-leg stance in endurance, team and combat athletes from the Spanish National Sport Technification Program. A total of 29 boys and 32 girls, aged 12 to 16 years old, were recruited. Centre of pressure (CoP) was measured on a force platform in standing position for 40 s under two sensorial and leg dominance conditions. Girls showed lower MVeloc (p < 0.001), MFreq (p > 0.001) and Sway (p < 0.001) values than boys in both sensorial conditions (open and closed eyes). The highest values in all PC variables were observed with eyes closed in both genders (p < 0.001). Sway values were lower in boys combat-athletes compared to endurance athletes in two sensorial conditions and with non-dominant leg (p < 0.05). Young athletes in their teens enrolled in a Sport Technification Program have shown differences in PC when comparing different visual conditions, sport disciplines and gender. This study opens a window to a better understanding of the determinants of PC during single-leg stance as a critical element in the sport specialization of young athletes.
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Affiliation(s)
- Carlos Villarón-Casales
- Biomechanics & Physiotherapy in Sports (BIOCAPS), Faculty of Health Sciences, Universidad Europea de Valencia, 46010 Valencia, Spain
| | - Arian Ramón Aladro-Gonzalvo
- Biomechanics & Physiotherapy in Sports (BIOCAPS), Faculty of Health Sciences, Universidad Europea de Valencia, 46010 Valencia, Spain
| | - Javier Gámez-Payá
- Biomechanics & Physiotherapy in Sports (BIOCAPS), Faculty of Health Sciences, Universidad Europea de Valencia, 46010 Valencia, Spain
| | - Alberto Pardo-Ibáñez
- Department of Physical Education and Sport, University of Valencia, 46010 Valencia, Spain
| | - Fernando Domínguez-Navarro
- Biomechanics & Physiotherapy in Sports (BIOCAPS), Faculty of Health Sciences, Universidad Europea de Valencia, 46010 Valencia, Spain
- Department of Physiotherapy, University of Valencia, 46010 Valencia, Spain
| | - Diana Gallego
- Biomechanics & Physiotherapy in Sports (BIOCAPS), Faculty of Health Sciences, Universidad Europea de Valencia, 46010 Valencia, Spain
| | - Jorge Alarcón-Jimenez
- Department of Physiotherapy, Universidad Católica de Valencia, 46900 Valencia, Spain
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Schillaci G, Ivaldi M. Fitness parameters in young football players are affected by training load and somatic-anthropometric variations. SPORT SCIENCES FOR HEALTH 2023. [DOI: 10.1007/s11332-023-01054-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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30
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Johnson D, Williams S, Bradley B, Cumming SP. Can we reduce injury risk during the adolescent growth spurt? An iterative sequence of prevention in male academy footballers. Ann Hum Biol 2023; 50:452-460. [PMID: 37823577 DOI: 10.1080/03014460.2023.2261854] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 09/13/2023] [Indexed: 10/13/2023]
Abstract
Background: The adolescent growth spurt is associated with an increased risk of injury in young athletes.Aim: This study aimed to use an interdisciplinary collaboration between technical coaches, sports scientists, and medical staff to mitigate this risk.Subjects and methods: 77 male academy footballers were followed across two seasons. At-risk players were identified using somatic maturity status and growth rate in stature and the lower limbs, using thresholds of 88% to 92.8% of predicted adult stature, ≥7.2 cm/year, and ≥3.6 cm/year, respectively. During the 2019-20 season, players with symptoms of a growth-related injury or two of three risk factors were included in an intervention strategy that included modified training load, football-specific skills, balance, coordination and landing drills, and an individualised strength program.Results: For players with the three risk factors, there was a significant reduction in the incidence (rate ratio [RR] = 0.14 (5.2 per 1000h → 0.8 per 1000h, p = 0.05) and burden (RR = 0.08 (216 per 1000h → 17 per 1000h, p = 0.02) between the seasons. For players with ≤2 risk factors, there were no significant differences in injury risk between the baseline and intervention seasons.Conclusion: Overall, it may be possible to mitigate injury incidence and burden during the adolescent growth spurt in high-risk athletes.
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Affiliation(s)
- David Johnson
- Department for Health, University of Bath, Bath, United Kingdom of Great Britain and Northern Ireland
- Sports Science and Medicine, AFC Bournemouth Football Club, Bournemouth, United Kingdom of Great Britain and Northern Ireland
| | - Sean Williams
- Department for Health, University of Bath, Bath, United Kingdom of Great Britain and Northern Ireland
| | - Ben Bradley
- Sports Science and Medicine, AFC Bournemouth Football Club, Bournemouth, United Kingdom of Great Britain and Northern Ireland
| | - Sean P Cumming
- Department for Health, University of Bath, Bath, United Kingdom of Great Britain and Northern Ireland
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Abbott S, Ibarcena D, Gwinn T, Struzik A, Halaki M, Kaloti G, Salter J, Cobley S. Longitudinal changing relationships between growth tempo and vertical stiffness in movement across maturation. Hum Mov Sci 2023; 87:103039. [PMID: 36446274 DOI: 10.1016/j.humov.2022.103039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 11/11/2022] [Accepted: 11/14/2022] [Indexed: 11/27/2022]
Abstract
PURPOSE To determine whether average growth tempo influenced longitudinal relationships between maturity status and coordination capability using a 15-s hopping task (Aim 1). To investigate how differences in absolute growth tempo were associated with change in coordination capability within and across peak growth (Aim 2). METHODS Participants were N1 = 110 (Aim 1) and N2 = 71 (Aim 2) Australian male competitive swimmers, aged 10-15 years, exposed to repeated-measures tracking (2-years, and 12-months respectively) of maturity status, growth tempo and movement coordination capability. Coordination capability was estimated via vertical stiffness (KV) in a hopping task, reflected by participant mean KV and between-jump coefficient of variation (CV). RESULTS For Aim 1, log-linear mixed model trends identified maturity status and growth tempo were significantly associated with KV mean and KV CV. For a given maturity status, mean KV was 9% lower in the 'High' average growth tempo group than the 'Low' average tempo group. For Aim 2, mixed repeated-measures analyses of variance identified how time points of increased growth tempo were significantly associated with 7-11% reductions in mean KV, with similar mean KV decrements irrespective of growth tempo group. Meanwhile, KVCV only illustrated progressive longitudinal reductions. CONCLUSIONS Within maturational progression, short-term accelerations in growth tempo corresponded with short-term decreases in KV mean, suggesting temporary disruptions to movement coordination capability. Measuring growth tempo and applying hopping tasks in specific movement contexts could help consistently identify disturbances in motor coordination.
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Affiliation(s)
- Shaun Abbott
- Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, New South Wales 2141, Australia
| | - Daniel Ibarcena
- Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, New South Wales 2141, Australia
| | - Tom Gwinn
- Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, New South Wales 2141, Australia
| | - Artur Struzik
- Department of Biomechanics, Wroclaw University of Health and Sport Sciences, Wroclaw, Poland
| | - Mark Halaki
- Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, New South Wales 2141, Australia
| | - Gurleen Kaloti
- Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, New South Wales 2141, Australia
| | - James Salter
- Swimming Australia Ltd, Sunnybank, Queensland, Australia
| | - Stephen Cobley
- Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, New South Wales 2141, Australia.
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Monasterio X, Gil S, Bidaurrazaga-Letona I, Lekue JA, Diaz-Beitia G, Santisteban JM, Lee DJ, Zumeta-Olaskoaga L, Martin-Garetxana I, Larruskain J. Peak Height Velocity Affects Injury Burden in Circa-PHV Soccer Players. Int J Sports Med 2023; 44:292-297. [PMID: 36410710 DOI: 10.1055/a-1983-6762] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Growth and maturation are potential risk factors for soccer injuries. This research sought to describe how peak height velocity (PHV) affects overall and specific injury burden in circa- and post-PHV elite academy soccer players. Injuries and growth data collected from 2000 to 2020 were studied retrospectively. Longitudinal height records for 124 players were fitted with the Super-Imposition by Translation and Rotation model to calculate PHV (cm/year) and age at PHV. Players were classified according to PHV percentile (fast:≥75th; average: 25-75th; slow:≤25th) and maturity status (circa- or post-PHV). Overall and specific injury burden (days lost/player-season) and rate ratios for comparisons between groups were calculated based on zero-inflated negative binomial models. Confidence intervals were calculated at the 95% confidence level (CI) and the significance level was set at<0.05. In circa-PHV, players with fast PHV had 2.6 (CI: 1.4-4.8)- and 3.3 (CI:1.3-6.7)-times higher overall burden and 2.9 (CI:1.1-7.1)- and 4.1 (CI: 1.4-15.2)-times higher for growth-related injury burden compared to players with average and slow PHV, respectively. Regular monitoring of growth seems important to detect players at higher risk for being disrupted by growth-related injuries.
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Affiliation(s)
| | - Susana Gil
- Physiology, University of the Basque Country, Leioa, Spain
| | | | - Jose A Lekue
- Medical Services, Athletic Club, Lezama, Spain.,Physiology, University of the Basque Country, Leioa, Spain
| | - Gontzal Diaz-Beitia
- Medical Services, Athletic Club, Lezama, Spain.,Physiology, University of the Basque Country, Leioa, Spain
| | - Juan M Santisteban
- Medical Services, Athletic Club, Lezama, Spain.,Physiology, University of the Basque Country, Leioa, Spain
| | - Dae-Jin Lee
- Basque Center for Applied Mathematics, Basque Center for Applied Mathematics, Bilbao, Spain
| | - Lore Zumeta-Olaskoaga
- Basque Center for Applied Mathematics, Basque Center for Applied Mathematics, Bilbao, Spain
| | - Imanol Martin-Garetxana
- Medical Services, Athletic Club, Lezama, Spain.,Physiology, University of the Basque Country, Leioa, Spain
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Cronström A, Tengman E, Häger CK. Return to Sports: A Risky Business? A Systematic Review with Meta-Analysis of Risk Factors for Graft Rupture Following ACL Reconstruction. Sports Med 2023; 53:91-110. [PMID: 36001289 PMCID: PMC9807539 DOI: 10.1007/s40279-022-01747-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/30/2022] [Indexed: 01/12/2023]
Abstract
BACKGROUND The risk of sustaining a graft rupture after anterior cruciate ligament reconstruction (ACLR) is high. Contributing risk factors are, however, still not clearly identified. OBJECTIVE The aim of this systematic review was to identify and quantify risk factors for graft rupture after ACLR. METHODS A systematic review with meta-analysis (PROSPERO CRD42020140129) based on PRISMA guidelines was performed. MEDLINE, CINAHL and EMBASE were searched from inception to September 2021. Prospective and retrospective studies addressing risk factors for graft rupture after ACLR in males/females of all ages were considered. Meta-analyses using a random effect model (effect measure: odds ratio [OR] with 95% confidence interval [CI]) were performed. The GRADE tool was used to assess evidence quality. RESULTS Following full-text screening of 310 relevant papers, 117 were eventually included, incorporating up to 133,000 individuals in each meta-analysis. Higher Tegner activity level (≥ 7 vs < 7) at primary injury (OR 3.91, 95% CI 1.69-9.04), increased tibial slope (degrees) (OR 2.21, 95% CI 1.26-3.86), lower psychological readiness to return to sport (RTS) (OR 2.18, 95% CI 1.32-3.61), early surgery (< 12 vs ≥ 12 months) (OR 1.87, 95% CI 1.58-2.22), RTS (pre-injury level) (OR 1.87, 95% CI 1.21-2.91) and family history of ACL injury (OR 1.76, 95% CI 1.34-2.31) were all associated with increased odds of graft rupture. Higher age (OR 0.47, 95% CI 0.39-0.59), female sex (OR 0.88, 95% CI 0.79-0.98), fewer self-reported knee symptoms pre-reconstruction (OR 0.81, 95% CI 0.69-0.95) and concomitant cartilage injuries (OR 0.70, 95% CI 0.62-0.79) instead decreased the odds. Meta-analysis revealed no association between body mass index, smoking, joint laxity, RTS time, knee kinematics, muscle strength or hop performance and graft rupture. CONCLUSION Conspicuous risk factors for graft rupture were mainly sports and hereditary related. Few studies investigated function-related modifiable factors or included sports exposure data.
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Affiliation(s)
- Anna Cronström
- Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden.
- Department of Health Sciences, Lund University, Lund, Sweden.
| | - Eva Tengman
- Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden
| | - Charlotte K Häger
- Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden
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34
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McClelland VM, Lin JP. Dystonia in Childhood: How Insights from Paediatric Research Enrich the Network Theory of Dystonia. ADVANCES IN NEUROBIOLOGY 2023; 31:1-22. [PMID: 37338693 DOI: 10.1007/978-3-031-26220-3_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
Dystonia is now widely accepted as a network disorder, with multiple brain regions and their interconnections playing a potential role in the pathophysiology. This model reconciles what could previously have been viewed as conflicting findings regarding the neuroanatomical and neurophysiological characteristics of the disorder, but there are still significant gaps in scientific understanding of the underlying pathophysiology. One of the greatest unmet challenges is to understand the network model of dystonia in the context of the developing brain. This article outlines how research in childhood dystonia supports and contributes to the network theory and highlights aspects where data from paediatric studies has revealed novel and unique physiological insights, with important implications for understanding dystonia across the lifespan.
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Affiliation(s)
- Verity M McClelland
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
- Children's Neurosciences Department, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK.
| | - Jean-Pierre Lin
- Children's Neurosciences Department, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
- Women and Children's Institute, Faculty of Life Sciences and Medicine (FolSM), King's College London, London, UK
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35
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Charbonnet B, Sieghartsleitner R, Schmid J, Zuber C, Zibung M, Conzelmann A. Maturity-based correction mechanism for talent identification: When is it needed, does it work, and does it help to better predict who will make it to the pros? J Sports Sci Med 2022; 21:640-657. [PMID: 36523901 PMCID: PMC9741715 DOI: 10.52082/jssm.2022.639] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 11/30/2022] [Indexed: 12/30/2022]
Abstract
When identifying talent, the confounding influence of maturity status on motor performances is an acknowledged problem. To solve this problem, correction mechanisms have been proposed to transform maturity-biased test scores into maturity-unbiased ones. Whether or not such corrections also improve predictive validity remains unclear. To address this question, we calculated correlations between maturity indicators and motor performance variables among a sample of 121 fifteen-year-old elite youth football players in Switzerland. We corrected motor performance scores identified as maturity-biased, and we assessed correction procedure efficacy. Subsequently, we examined whether corrected scores better predicted levels of performance achievement 6 years after data collection (47 professionals vs. 74 non-professional players) compared with raw scores using point biserial correlations, binary logistic regression models, and DeLong tests. Expectedly, maturity indicators correlated with raw scores (0.16 ≤ | r | ≤ 0.72; ps < 0.05), yet not with corrected scores. Contrary to expectations, corrected scores were not associated with an additional predictive benefit (univariate: no significant r-change; multivariate: 0.02 ≤ ΔAUC ≤ 0.03, ps > 0.05). We do not interpret raw and corrected score equivalent predictions as a sign of correction mechanism futility (more work for the same output); rather we view them as an invitation to take corrected scores seriously into account (same output, one fewer problem) and to revise correction-related expectations according to initial predictive validity of motor variables, validity of maturity indicators, initial maturity-bias, and selection systems. Recommending maturity-based corrections is legitimate, yet currently based on theoretical rather than empirical (predictive) arguments.
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Affiliation(s)
- Bryan Charbonnet
- Institute of Sport Science, University of Bern, Bremgartenstrasse 145, CH-3012 Bern, Switzerland
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36
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Charbonnet B, Sieghartsleitner R, Schmid J, Zuber C, Zibung M, Conzelmann A. Maturity-based correction mechanism for talent identification: When is it needed, does it work, and does it help to better predict who will make it to the pros? J Sports Sci Med 2022. [DOI: 10.52082/jssm.2022.640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
When identifying talent, the confounding influence of maturity status on motor performances is an acknowledged problem. To solve this problem, correction mechanisms have been proposed to transform maturity-biased test scores into maturity-unbiased ones. Whether or not such corrections also improve predictive validity remains unclear. To address this question, we calculated correlations between maturity indicators and motor performance variables among a sample of 121 fifteen-year-old elite youth football players in Switzerland. We corrected motor performance scores identified as maturity-biased, and we assessed correction procedure efficacy. Subsequently, we examined whether corrected scores better predicted levels of performance achievement 6 years after data collection (47 professionals vs. 74 non-professional players) compared with raw scores using point biserial correlations, binary logistic regression models, and DeLong tests. Expectedly, maturity indicators correlated with raw scores (0.16 ≤ | r | ≤ 0.72; ps < 0.05), yet not with corrected scores. Contrary to expectations, corrected scores were not associated with an additional predictive benefit (univariate: no significant r-change; multivariate: 0.02 ≤ ΔAUC ≤ 0.03, ps > 0.05). We do not interpret raw and corrected score equivalent predictions as a sign of correction mechanism futility (more work for the same output); rather we view them as an invitation to take corrected scores seriously into account (same output, one fewer problem) and to revise correction-related expectations according to initial predictive validity of motor variables, validity of maturity indicators, initial maturity-bias, and selection systems. Recommending maturity-based corrections is legitimate, yet currently based on theoretical rather than empirical (predictive) arguments.
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Wik EH. Growth, maturation and injuries in high-level youth football (soccer): A mini review. Front Sports Act Living 2022; 4:975900. [PMID: 36385783 PMCID: PMC9663653 DOI: 10.3389/fspor.2022.975900] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 08/24/2022] [Indexed: 12/02/2022] Open
Abstract
Understanding the challenges football (soccer) players face during adolescence is fundamental to avoid disruptions in their development due to injury. This mini review will describe basic concepts of somatic growth and biological maturity, examine data from 53 prospective epidemiological studies on high-level youth football players and discuss how age, growth and maturity may affect the injury patterns observed. Based on the existing evidence, at least every third player sustains an injury during a football season. The thigh (median for studies of boys: 25%, median for girls: 21%), ankle (b: 18%, g: 30%), knee (b: 17%, g: 18%) and hip/groin (b: 14%, g: 10%) are the body parts injured most often, while muscle strains (b: 31%, g: 25%), sprains (b: 20%, g: 27%) and contusions (b: 17%, g: 16%) are the most common injury types. Injury trends are, however, not consistent throughout adolescence, and players' age, maturity status and position relative to peak height velocity (PHV) have shown to influence the number, type and location of injuries sustained. Despite a high volume of observational injury studies published on high-level youth players, girls (7 studies) and settings outside of Europe (included in 23% of studies) are underrepresented and should receive extra attention in the future. Based on the available epidemiological data, tailored injury reduction programmes can be considered in youth football, alongside application of general training principles such as progression, variation and individualization which may be especially important during vulnerable phases such as the adolescent growth spurt.
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Affiliation(s)
- Eirik Halvorsen Wik
- Department of Exercise, Sport and Lifestyle Medicine, Faculty of Medicine and Health Sciences, Institute of Sport and Exercise Medicine, Stellenbosch University, Stellenbosch, South Africa
- Division of Physiotherapy, Department of Health and Rehabilitation Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa
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38
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Matsuzaki Y, Heath MR, Khan JM, Mackie AT, Spitzer E, Fabricant PD. Reliability of 2-Dimensional Video Analysis in Adolescent Runners. HSS J 2022; 18:512-518. [PMID: 36263278 PMCID: PMC9527543 DOI: 10.1177/15563316221082011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 11/26/2021] [Indexed: 02/07/2023]
Abstract
Background The literature on the reliability of qualitative and quantitative measures for running video analysis in the adolescent population is limited. Reliability of 2-dimensional (2D) video analysis has been reported in adult runners, but these findings may not apply to youth runners. Purpose We sought to determine the intra-rater and inter-rater reliability of sagittal and frontal plane kinematics using 2D video analysis in healthy adolescent runners. Methods High-definition (1080p) videos were recorded of 10 healthy runners between 14 and 18 years old running on a treadmill at self-selected speed with markers attached to the cervical spine, pelvis, and lower extremities. Kinematic variables in the sagittal and frontal planes were measured using Dartfish Motion Analysis Software by 3 raters (2 sports medicine physical therapists and a research assistant). Intra- and inter-rater reliability were calculated using intraclass correlation coefficients (ICCs). Results Of the 10 runners, 4 (40%) were male and the mean age was 16 ± 1.5 years. The intra-rater ICC for all kinematic variables ranged from 0.574 to 0.999 for the experienced physical therapist, and 0.367 to 0.973 for the inexperienced research assistant. The inter-rater ICC for all raters ranged from -0.01 to 0.941. Eleven kinematic variables showed substantial agreement and 4 showed almost perfect agreement. Step width and foot progression showed fair and poor agreement, respectively. Conclusions Running analysis using 2D video can be performed reliably in adolescents on all kinematic variables except for step width and foot progression. Inexperienced raters can be properly trained in the video analysis of running kinematics to consistently assess the same runner.
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Affiliation(s)
- Yukiko Matsuzaki
- Department of Pediatric Rehabilitation, Department of Sports Rehabilitation and Performance, Hospital for Special Surgery, New York, NY, USA
- Department of Sports Rehabilitation and Performance, Hospital for Special Surgery, New York, NY, USA
| | - Madison R. Heath
- Division of Pediatric Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Julianne M. Khan
- Department of Sports Rehabilitation and Performance, Hospital for Special Surgery, New York, NY, USA
| | - Alexandra T. Mackie
- Department of Pediatric Rehabilitation, Department of Sports Rehabilitation and Performance, Hospital for Special Surgery, New York, NY, USA
| | | | - Peter D. Fabricant
- Division of Pediatric Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
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39
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Tsutsui T, Iizuka S, Sakamaki W, Maemichi T, Torii S. Growth until Peak Height Velocity Occurs Rapidly in Early Maturing Adolescent Boys. CHILDREN (BASEL, SWITZERLAND) 2022; 9:children9101570. [PMID: 36291506 PMCID: PMC9600346 DOI: 10.3390/children9101570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/08/2022] [Accepted: 10/17/2022] [Indexed: 11/26/2022]
Abstract
The timing and tempo of growth rate varies inter-individually during adolescence and can have an impact on athletic performance. This study aimed to determine the difference in growth rate for each maturity status. We combined data collected both retrospectively and prospectively from 78 adolescent boys aged 12 years old; growth charts were collected from their elementary school records, and the height of each participant was subsequently measured every six months over a period of two years. Take Off Age (TOA), Peak Height Velocity Age (PHVA), and Final Height Age (FHA) were estimated using the AUXAL 3.1 program. Growth Tempo 1 and 2 were calculated by dividing the height increase by the time difference between TOA and PHVA, and FHA, respectively. Our results showed three group differences based on the maturation status of PHVA: Growth Tempo 1 and 2 were both higher in the early than during middle and late maturation. Additionally, entering the height at each event as a covariate, the group differences for Growth Tempo 1 did not change; however, for Growth Tempo 2, group differences were eliminated. Therefore, we conclude that during early maturation, growth from TOA to PHVA occurs rapidly and in a shorter period.
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Affiliation(s)
- Toshiharu Tsutsui
- Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
| | - Satoshi Iizuka
- Japan Institute of Sports Science, 3-15-1 Nishigaoka, Kita-ku, Tokyo 115-0056, Japan
| | - Wataru Sakamaki
- Graduate School of Sport Sciences, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
| | - Toshihiro Maemichi
- Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
| | - Suguru Torii
- Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
- Correspondence:
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40
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Chia L, De Oliveira Silva D, Whalan M, McKay MJ, Sullivan J, Fuller CW, Pappas E. Non-contact Anterior Cruciate Ligament Injury Epidemiology in Team-Ball Sports: A Systematic Review with Meta-analysis by Sex, Age, Sport, Participation Level, and Exposure Type. Sports Med 2022; 52:2447-2467. [PMID: 35622227 PMCID: PMC9136558 DOI: 10.1007/s40279-022-01697-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/23/2022] [Indexed: 01/18/2023]
Abstract
BACKGROUND Not all anterior cruciate ligament (ACL) injuries are preventable. While some ACL injuries are unavoidable such as those resulting from a tackle, others that occur in non-contact situations like twisting and turning in the absence of external contact might be more preventable. Because ACL injuries commonly occur in team ball-sports that involve jumping, landing and cutting manoeuvres, accurate information about the epidemiology of non-contact ACL injuries in these sports is needed to quantify their extent and burden to guide resource allocation for risk-reduction efforts. OBJECTIVE To synthesize the evidence on the incidence and proportion of non-contact to total ACL injuries by sex, age, sport, participation level and exposure type in team ball-sports. METHODS Six databases (MEDLINE, EMBASE, Web of Science, CINAHL, Scopus and SPORTDiscus) were searched from inception to July 2021. Cohort studies of team ball-sports reporting number of knee injuries as a function of exposure and injury mechanism were included. RESULTS Forty-five studies covering 13 team ball-sports were included. The overall proportion of non-contact to total ACL injuries was 55% (95% CI 48-62, I2 = 82%; females: 63%, 95% CI 53-71, I2 = 84%; males: 50%, 95% CI 42-58, I2 = 86%). The overall incidence of non-contact ACL injuries was 0.07 per 1000 player-hours (95% CI 0.05-0.10, I2 = 77%), and 0.05 per 1000 player-exposures (95% CI 0.03-0.07, I2 = 97%). Injury incidence was higher in female athletes (0.14 per 1000 player-hours, 95% CI 0.10-0.19, I2 = 40%) than male athletes (0.05 per 1000 player-hours, 95% CI 0.03-0.07, I2 = 48%), and this difference was significant. Injury incidence during competition was higher (0.48 per 1000 player-hours, 95% CI 0.32-0.72, I2 = 77%; 0.32 per 1000 player-exposures, 95% CI 0.15-0.70, I2 = 96%) than during training (0.04 per 1000 player-hours, 95% CI 0.02-0.07, I2 = 63%; 0.02 per 1000 player-exposures, 95% CI 0.01-0.05, I2 = 86%) and these differences were significant. Heterogeneity across studies was generally high. CONCLUSION This study quantifies several key epidemiological findings for ACL injuries in team ball-sports. Non-contact ACL injuries represented over half of all ACL injuries sustained. The proportion of non-contact to total ACL injuries and injury incidence were higher in female than in male athletes. Injuries mostly occurred in competition settings.
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Affiliation(s)
- Lionel Chia
- Faculty of Medicine and Health, Sydney School of Health Sciences, Discipline of Physiotherapy, The University of Sydney, Sydney, NSW, Australia.
- Cleveland Guardians Baseball Company, Cleveland, OH, USA.
| | - Danilo De Oliveira Silva
- La Trobe Sport and Exercise Medicine Research Centre, School of Allied Health, Human Services and Sport, La Trobe University, VIC, Australia
| | - Matthew Whalan
- Research and Development Department, Football Australia, Sydney, NSW, Australia
- Centre of Medical and Exercise Physiology, School of Medical, Indigenous & Health Sciences, University of Wollongong, Wollongong, NSW, Australia
| | - Marnee J McKay
- Faculty of Medicine and Health, Sydney School of Health Sciences, Discipline of Physiotherapy, The University of Sydney, Sydney, NSW, Australia
| | - Justin Sullivan
- Faculty of Medicine and Health, Sydney School of Health Sciences, Discipline of Physiotherapy, The University of Sydney, Sydney, NSW, Australia
| | | | - Evangelos Pappas
- Faculty of Medicine and Health, Sydney School of Health Sciences, Discipline of Physiotherapy, The University of Sydney, Sydney, NSW, Australia
- School of Medicine and Illawarra Health and Medical Research Institute, The University of Wollongong, Wollongong, NSW, Australia
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Thieschäfer L, Büsch D. Development and trainability of agility in youth: A systematic scoping review. Front Sports Act Living 2022; 4:952779. [PMID: 36157901 PMCID: PMC9496649 DOI: 10.3389/fspor.2022.952779] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 08/08/2022] [Indexed: 11/13/2022] Open
Abstract
Background Agility is acknowledged as a crucial factor of performance in various open skill sports in both adult and youth athletes. However, despite its significance for sports performance the development and the trainability of agility are under-researched within the pediatric literature. A systematic scoping review was considered most appropriate to provide researchers and practitioners with an overview of the current body of literature approaching agility in youth. Objectives The objectives of this scoping review were to map the extent, range, and nature of existing evidence regarding trainability and "natural" development of agility and to summarize corresponding study results. Methods The scoping review protocol was pre-registered at Open Science Framework. Systematic searches were conducted using the databases PubMed, Scopus, ProQuest, Web of Science, SURF, and SPONET to identify sources covering agility in youth. Among other inclusion criteria, only references applying unplanned agility concepts were included. Results Ultimately, 41 reports were included comprising 23 observational studies, 14 experimental studies, and 4 references of secondary research. A total of 3,087 subjects were assessed in the included studies. Subject groups were predominantly male, above 10 years of age, and soccer athletes. Outcomes of observational studies indicate an effect of age and maturation on agility performance resulting in a non-linear "natural" development of agility. Furthermore, relationships between contributing perceptual-cognitive factors and agility performance tend to increase with progressing age, whereas relationships between physical factors and agility performance diminish. Evidence of training studies suggests that agility is trainable in youth, albeit with various underlying mechanisms. Conclusions This systematic scoping review is the first mapping of the body of literature about agility in youth. It outlines the current evidence base, reveals research gaps, and points out future directions to support researchers and practitioners in this field. Although, increasing research activity in this field is discernible, agility research in youth is still in its infancy. Considering the significance of agility for sports performance, future research is postulated to design evidence-based strategies for long-term agility development in young athletes.
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Affiliation(s)
- Lutz Thieschäfer
- Institute of Sport Science, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
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42
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Lüdin D, Donath L, Cobley S, Mann D, Romann M. Player-labelling as a solution to overcome maturation selection biases in youth football. J Sports Sci 2022; 40:1641-1647. [PMID: 35969578 DOI: 10.1080/02640414.2022.2099077] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
The fact that potentially skilled, but biologically later-maturing athletes are less likely to be selected into talent development programmes (TDP) can represent a failure of Talent Identification (TID) in sports. To overcome maturation selection biases, maturation independent TID should be established to include less mature, but talented athletes in TDP more frequently. Using a randomised parallel-group design, this study aimed to evaluate the effect of labelling under-11 (U11) Swiss male youth football players (n = 24, age = 11.0 ± 0.3 years) via maturation-ordered shirt numbers during rank assessment by talent scouts (n = 83, scout experience = 4.8 ± 2.4 years). Following observation of video recorded selection tournaments, player-labelling "informed" scouts were significantly more likely to rank less mature players higher on their player potential, t(81) = 2.57, p = .012, d = -0.6, 95% CI [-1.00, -0.13], than "uninformed" scouts. As altered rankings assisted less mature players, player-labelling may offer a practical and feasible strategy to improve TID by removing possible maturation selection biases. To address maturation selection biases and the potential positive impact of player-labelling more broadly, further research on both male and female athletes in various age categories and sports contexts is recommended.
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Affiliation(s)
- Dennis Lüdin
- Swiss Federal Institute of Sport Magglingen, Department of Elite Sport, Magglingen, Switzerland
| | - Lars Donath
- German Sport University Cologne, Department of Intervention Research in Exercise Training, Cologne, Germany
| | - Stephen Cobley
- University of Sydney, Department of Exercise and Sport Science, Sydney, Australia
| | - David Mann
- Vrije Universiteit Amsterdam, Faculty of Behavioural and Movement Sciences, Amsterdam, Netherlands
| | - Michael Romann
- Swiss Federal Institute of Sport Magglingen, Department of Elite Sport, Magglingen, Switzerland
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Poor Reliability of Measurement Instruments to Assess Acute Responses to Load in Soccer Players Irrespective of Biological Maturity Status. Pediatr Exerc Sci 2022; 34:125-134. [PMID: 35045392 DOI: 10.1123/pes.2021-0070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 11/01/2021] [Accepted: 12/15/2021] [Indexed: 11/18/2022]
Abstract
PURPOSE To assess the short-term reliability of measurement instruments to quantify the acute psychophysiological response to load in adolescent soccer players in relation to biological maturity. METHODS Data were collected from 108 U12 to U17 soccer players on 2 consecutive weeks (pre, n = 32; at, n = 34; and post, n = 42 estimated peak height velocity). Measurements consisted of the Short Recovery and Stress Scale, a countermovement jump, assessment of leg stiffness, and a submaximal run to assess exercise heart rate and heart rate recovery. Test-retest reliability was assessed with the coefficient of variation (CV) and intraclass correlation coefficient (ICC). RESULTS Items of the Short Recovery and Stress Scale showed poor reliability across maturity groups (CV = 7.0%-53.5%; ICC = .28 to .79). Only few countermovement jump variables (jump height, concentric impulse, and concentric velocity) possessed good reliability. For most variables of the countermovement jump, reliability was better for the post peak height velocity group followed by at-peak height velocity and prepeak height velocity. Very high levels of reliability across maturity groups were observed for exercise heart rate (CV < 1.8%; ICC > .94), while heart rate recovery was more variable (CV < 16.5%; ICC > .48). CONCLUSION Results suggest that the majority of investigated variables have poor reliability, questioning their ability to detect small, yet meaningful changes in acute responses to load in adolescent soccer players.
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DeJong Lempke AF, Whitney KE, Collins SE, d'Hemecourt PA, Meehan Iii WP. Biomechanical running gait assessments across prevalent adolescent musculoskeletal injuries. Gait Posture 2022; 96:123-129. [PMID: 35642825 DOI: 10.1016/j.gaitpost.2022.05.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 05/05/2022] [Accepted: 05/20/2022] [Indexed: 02/02/2023]
Abstract
BACKGROUND While there is substantial information available regarding expected biomechanical adaptations associated with adult running-related injuries, less is known about adolescent gait profiles that may influence injury development. RESEARCH QUESTIONS Which biomechanical profiles are associated with prevalent musculoskeletal lower extremity injuries among adolescent runners, and how do these profiles compare across injury types and body regions? METHODS We conducted a cross-sectional study of 149 injured adolescents (110 F; 39 M) seen at a hospital-affiliated injured runner's clinic between the years 2016-2021. Biomechanical data were obtained from 2-dimensional video analyses and an instrumented treadmill system. Multivariate analyses of variance covarying for gender and body mass index were used to compare continuous biomechanical measures, and Chi-square analyses were used to compare categorical biomechanical variables across injury types and body regions. Spearman's rho correlation analyses were conducted to assess the relationship of significant outcomes. RESULTS Patients with bony injuries had significantly higher maximum vertical ground reaction forces (bony: 1.87 body weight [BW] vs. soft tissue: 1.79BW, p = 0.05), and a higher proportion of runners with contralateral pelvic drop at midstance (χ2 =5.3, p = 0.02). Maximum vertical ground reaction forces and pelvic drop were significantly yet weakly correlated (ρ = 0.20, p = 0.01). Foot strike patterns differed across injured body regions, with a higher proportion of hip and knee injury patients presenting with forefoot strike patterns (χ2 =22.0, p = 0.01). SIGNIFICANCE These biomechanical factors may represent risk factors for injuries sustained by young runners. Clinicians may consider assessing these gait adaptations when treating injured adolescent patients.
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Affiliation(s)
- Alexandra F DeJong Lempke
- Micheli Center for Sports Injury Prevention, Waltham, MA, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA, USA.
| | - Kristin E Whitney
- Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Sara E Collins
- Micheli Center for Sports Injury Prevention, Waltham, MA, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA, USA
| | - Pierre A d'Hemecourt
- Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - William P Meehan Iii
- Micheli Center for Sports Injury Prevention, Waltham, MA, USA; Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
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Robles-Palazón FJ, Ayala F, Cejudo A, De Ste Croix M, Sainz de Baranda P, Santonja F. Effects of Age and Maturation on Lower Extremity Range of Motion in Male Youth Soccer Players. J Strength Cond Res 2022; 36:1417-1425. [PMID: 32398630 DOI: 10.1519/jsc.0000000000003642] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
ABSTRACT Robles-Palazón, FJ, Ayala, F, Cejudo, A, De Ste Croix, M, Sainz de Baranda, P, and Santonja, F. Effects of age and maturation on lower extremity range of motion in male youth soccer players. J Strength Cond Res 36(5): 1417-1425, 2022-Restricted joint range of motion (ROM) has been considered as a primary risk factor for some sport-related injuries. Consequently, preparticipation assessment of lower extremity joints ROM could help identify youth soccer players at high risk of injury and to aid in the design of tailored age and maturational specific training interventions. The purpose of this study was to analyze and compare the influence of chronological age and maturational stage on several lower extremity ROM measures, as well as to describe the lower extremity ROM profile using a comprehensive approach in youth soccer players. A total of 286 male youth soccer players' ROM were assessed including passive hip (extension [PHE], adduction with hip flexed 90° [PHADHF90°], flexion with knee flexed [PHFKF] and extended [PHFKE], abduction with hip neutral [PHABD] and flexed 90° [PHABDHF90°], external [PHER] and internal [PHIR] rotation), knee (flexion [PKF]) and ankle (dorsiflexion with knee flexed [ADFKF] and extended [ADFKE]) ROMs. Between-group differences were analyzed using a one-way analysis of variance (ANOVA) and magnitude-based decisions. The results only report statistically significant (p < 0.05; d > 0.5) and clinically relevant differences (>8°) for the PKF ROM between U12 vs. U19, and Pre-PHV vs. Post-PHV groups. Furthermore, approximately 40, 35, and 20% of players displayed restrictions in their PHFKE, PKF, and ADFKF ROM values, respectively. These findings emphasize the necessity of prescribing (across all age groups and periods of growth and maturation) compensatory measures in daily soccer training, and these exercises should be equally applied to both limbs with the aim of improving PHFKE, PKF and ADFKF ROM values.
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Affiliation(s)
- Francisco Javier Robles-Palazón
- Department of Physical Activity and Sport, Faculty of Sport Sciences, Campus of Excellence Mare Nostrum, University of Murcia, Murcia, Spain
| | - Francisco Ayala
- School of Sport and Exercise, University of Gloucestershire, Gloucester, United Kingdom; and
| | - Antonio Cejudo
- Department of Physical Activity and Sport, Faculty of Sport Sciences, Campus of Excellence Mare Nostrum, University of Murcia, Murcia, Spain
| | - Mark De Ste Croix
- School of Sport and Exercise, University of Gloucestershire, Gloucester, United Kingdom; and
| | - Pilar Sainz de Baranda
- Department of Physical Activity and Sport, Faculty of Sport Sciences, Campus of Excellence Mare Nostrum, University of Murcia, Murcia, Spain
| | - Fernando Santonja
- Virgin of the Arrixaca University Hospital, Faculty of Medicine, Campus of Excellence Mare Nostrum, University of Murcia, Murcia, Spain
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46
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Gonzalez M, Su H, Fu Q. Age-dependent Upper Limb Myoelectric Control Capability in Typically Developing Children. IEEE Trans Neural Syst Rehabil Eng 2022; 30:1009-1018. [PMID: 35412985 DOI: 10.1109/tnsre.2022.3166800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Research in EMG-based control of prostheses has mainly utilized adult subjects who have fully developed neuromuscular control. Little is known about children's ability to generate consistent EMG signals necessary to control artificial limbs with multiple degrees of freedom. As a first step to address this gap, experiments were designed to validate and benchmark two experimental protocols that quantify the ability to coordinate forearm muscle contractions in typically developing children. Able-bodied, healthy adults and children participated in our experiments that aimed to measure an individual's ability to use myoelectric control interfaces. In the first experiment, participants performed 8 repetitions of 16 different hand/wrist movements. Using offline classification analysis based on Support Vector Machine, we quantified their ability to consistently produce distinguishable muscle contraction patterns. We demonstrated that children had a smaller number of highly independent movements (can be classified with >90% accuracy) than adults did. The second experiment measured participants' ability to control the position of a cursor on a 1-DoF virtual slide using proportional EMG control with three different visuomotor gain levels. We found that children had higher failure rates and slower average target acquisitions than adults did, primarily due to longer correction times that did not improve over repetitive practice. We also found that the performance in both experiments was age-dependent in children. The results of this study provide novel insights into the technical and empirical basis to better understand neuromuscular development in children with upper-limb loss.
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Kiers K, Ellenberger L, Jermann J, Oberle F, Frey WO, Spörri J. Prospective Study on Dynamic Postural Stability in Youth Competitive Alpine Skiers: Test-Retest Reliability and Reference Values as a Function of Sex, Age and Biological Maturation. Front Physiol 2022; 13:804165. [PMID: 35480039 PMCID: PMC9035548 DOI: 10.3389/fphys.2022.804165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 03/28/2022] [Indexed: 11/23/2022] Open
Abstract
This study aimed 1) to assess the test-retest reliability of dynamic postural stability index (DPSI) assessments using a ski-specific jump protocol that consists of single-leg landings on a three-dimensional force plate after forward-performed double-leg drop jumps from a box over a hurdle (DJSLLs), 2) to provide reference values for female and male youth competitive alpine skiers; 3) to explore their changes in DPSI over 3 years during adolescence; and 4) to investigate potential associations of DPSI with age and biological maturation. Using three-dimensional force plates, 16 healthy subjects were tested on the same day (test-retest reliability experiment; five test-retest assessments of right leg landings), and 76 youth skiers aged 13–15 years were tested 3 times within 2 years (main experiment; average of two trials per leg each time). The test-retest reliability experiment revealed an ICC(3,1) and 95% CI of 0.86 [0.74, 0.94] for absolute DPSI assessment. The within-subject SEM of absolute DPSI was 16.30 N [13.66 N, 20.65 N], and the standardized typical error was moderate (0.39 [0.33, 0.50]). Both absolute and relative DPSI values were comparable between male and female youth competitive alpine skiers. The mean absolute DPSI in year 1 (195.7 ± 40.9 N), year 2 (196.5 ± 38.9 N) and year 3 (211.5 ± 41.3 N) continuously increased (i.e., worsened) (p < 0.001). Mean relative, i.e. body weight force normalized, DPSI values significantly decreased, i.e., improved, from year 1 to 2 (0.42 ± 0.01 vs. 0.36 ± 0.004; p < 0.001) and year 1 to 3 (0.42 ± 0.01 vs. 0.36 ± 0.01; p < 0.001). Absolute DPSI correlated with age and biological maturation, while no such correlations were found for relative DPSI values. Our findings suggest that DPSI is a reliable and sensitive measure of dynamic postural control during DJSLLs and that relative DPSI improves annually in competitive youth skiers when accounting for body weight. Future work should consider biological maturation testing during the growth spurt, and normalizing to body weight force could be a possible solution.
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Affiliation(s)
- Kirsten Kiers
- Sports Medical Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Centre for Prevention and Sports Medicine, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Lynn Ellenberger
- Sports Medical Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Centre for Prevention and Sports Medicine, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Julia Jermann
- Sports Medical Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Centre for Prevention and Sports Medicine, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Felix Oberle
- Sports Medical Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Centre for Prevention and Sports Medicine, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Walter O. Frey
- Sports Medical Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Centre for Prevention and Sports Medicine, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Jörg Spörri
- Sports Medical Research Group, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Centre for Prevention and Sports Medicine, Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- *Correspondence: Jörg Spörri,
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48
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McBurnie AJ, Parr J, Kelly DM, Dos'Santos T. Multidirectional Speed in Youth Soccer Players: Programming Considerations and Practical Applications. Strength Cond J 2022. [DOI: 10.1519/ssc.0000000000000657] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Vist Hagen R, Haga M, Sigmundsson H, Lorås H. The association between academic achievement in physical education and timing of biological maturity in adolescents. PLoS One 2022; 17:e0265718. [PMID: 35303041 PMCID: PMC8932553 DOI: 10.1371/journal.pone.0265718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 03/07/2022] [Indexed: 11/23/2022] Open
Abstract
Individual differences in tempo and timing of biological maturity, especially in adolescents, has been argued as a potential underlying cause of relative age effects observed in Physical education (PE). Indeed, differences in maturation could influence pupils`achievement in PE where motor behavior and physical activity are central tenets. However, the timing of biological maturity has not previously been investigated in the context of academic achievement in PE. Therefore, the current study`s aim was to investigate the association between timing of biological maturity and relative age on adolescents`academic achievement in PE. The data material consists of two samples from lower secondary schools (13–16 years old). Sample 1 (45 boys and 31 girls) was used to compare differences in anthropometrics and indicators of biological maturity between pupils with different grades (i.e., 3/4, 5, 6), while in sample 2 (114 boys and 127 girls) differences in mean grade were compared between birth quartiles. Pupils`final grade in PE were collected for both samples as a proxy for academic achievement. A one-way analysis of variance indicated a moderate-to-large association between timing of biological maturity, through age at peak height velocity, and academic achievement in PE, where later maturing pupils received a higher grade compared to earlier maturing pupils. Results from a factorial analysis of variance indicated an interaction effect between gender and birth quartile on academic achievement in PE. Post hoc analysis revealed that relatively younger boys received significantly lower grades as opposed to their relatively older peers. This effect was not present for girls. Collectively, these results indicate that developmental differences are associated with academic achievement in PE. Hence, PE teachers should be aware of these individual constraints in their teaching and assessment practice to accommodate fair and equal opportunities for achievement in the subject.
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Affiliation(s)
- Ruben Vist Hagen
- Department of Teacher Education, Norwegian University of Science and Technology, Trondheim, Norway
- * E-mail:
| | - Monika Haga
- Department of Teacher Education, Norwegian University of Science and Technology, Trondheim, Norway
| | - Hermundur Sigmundsson
- Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Håvard Lorås
- Department of Teacher Education, Norwegian University of Science and Technology, Trondheim, Norway
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Johnson DM, Cumming SP, Bradley B, Williams S. The influence of exposure, growth and maturation on injury risk in male academy football players. J Sports Sci 2022; 40:1127-1136. [DOI: 10.1080/02640414.2022.2051380] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- David M. Johnson
- Department for Health, University of Bath, Bath, UK
- Academy Sports Science and Medicine Department, AFC Bournemouth, Bournemouth, UK
| | | | - Ben Bradley
- Academy Sports Science and Medicine Department, AFC Bournemouth, Bournemouth, UK
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