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Asencio P, García-Valverde A, Albaladejo-García C, Beato M, Moreno FJ, Sabido R. Analysis of Concentric and Eccentric Power in Flywheel Exercises Depending on the Subjects' Strength Level and Body Mass. J Strength Cond Res 2024:00124278-990000000-00456. [PMID: 38838215 DOI: 10.1519/jsc.0000000000004818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
ABSTRACT Asencio, P, García-Valverde, A, Albaladejo-García, C, Beato, M, Moreno-Hernández, FJ, and Sabido, R. Analysis of concentric and eccentric power in flywheel exercises depending on the subjects' strength level and body mass. J Strength Cond Res XX(X): 000-000, 2024-The objective of this study is to describe how flywheel exercise mechanical outputs are affected by the athletes' body mass (BM) and strength level and by the exercise type. Forty-six recreational athletes came to a laboratory 3 times. On the first day, descriptive data, squat (1 repetition maximum: 1RM) and flywheel familiarization were performed. After a second day of familiarization, subjects performed a randomized flywheel exercise-testing protocol of squat and split squat exercises. The variables used for data analysis were peak concentric power and peak eccentric power, eccentric/concentric ratio, and their relationship with 1RM/BM. Subjects were assigned to a stronger or weaker group according to their 1RM/BM ratio. Group differences were found in absolute values of eccentric overload (EOL) (p < 0.01; effect size [ES] = 0.51) and EOL/BM (p < 0.01; ES = 0.46) only in the split squat. Absolute power values in the concentric phase showed differences between inertial load (p < 0.01; ES = 0.41). The stronger group did not present significant differences between inertial loads during squat (p < 0.01; ES = 0.46), but they showed different ratios with light inertias in comparison with the weaker group (p < 0.01; ES = 0.46). There were significant differences between groups with light inertias in split squat (nondominant) and squat exercises (p < 0.05; ES = 0.29) in the eccentric and concentric phases (p < 0.116; ES = 0.20). Squat and split squat exercises present different profiles depending on the training level. In conclusion, it is recommended that practitioners perform a test to understand the inertial load-power profile (concentric, eccentric, and their ratio) for each exercise and also consider the user's strength level for selection of the inertial load and for the exercise to use in training.
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Affiliation(s)
- Pablo Asencio
- Sports Research Centre, Department of Sport Sciences, Miguel Hernández University, Elche, Spain
| | | | | | - Marco Beato
- School of Health and Sport Science, University of Suffolk, Ipswich, United Kingdom
| | - Francisco J Moreno
- Sports Research Centre, Department of Sport Sciences, Miguel Hernández University, Elche, Spain
| | - Rafael Sabido
- Sports Research Centre, Department of Sport Sciences, Miguel Hernández University, Elche, Spain
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Wang J, Zhang Q, Chen W, Fu H, Zhang M, Fan Y. The effect of flywheel complex training with eccentric-overload on muscular adaptation in elite female volleyball players. PeerJ 2024; 12:e17079. [PMID: 38525282 PMCID: PMC10961060 DOI: 10.7717/peerj.17079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 02/19/2024] [Indexed: 03/26/2024] Open
Abstract
This study aimed to compare the effects of 8 weeks (24 sessions) between flywheel complex training with eccentric overload and traditional complex training of well-trained volleyball players on muscle adaptation, including hypertrophy, strength, and power variables. Fourteen athletes were recruited and randomly divided into the flywheel complex training with an eccentric-overload group (FCTEO, n = 7) and the control group (the traditional complex training group, TCT, n = 7). Participants performed half-squats using a flywheel device or Smith machine and drop jumps, with three sets of eight repetitions and three sets of 12 repetitions, respectively. The variables assessed included the muscle thickness at the proximal, mid, and distal sections of the quadriceps femoris, maximal half-squats strength (1RM-SS), squat jump (SJ), countermovement jump (CMJ), and three-step approach jump (AJ). In addition, a two-way repeated ANOVA analysis was used to find differences between the two groups and between the two testing times (pre-test vs. post-test). The indicators of the FCTEO group showed a significantly better improvement (p < 0.05) in CMJ (height: ES = 0.648, peak power: ES = 0.750), AJ (height: ES = 0.537, peak power: ES = 0.441), 1RM-SS (ES = 0.671) compared to the TCT group and the muscle thicknes at the mid of the quadriceps femoris (ES = 0.504) after FCTEO training. Since volleyball requires lower limb strength and explosive effort during repeated jumps and spiking, these results suggest that FCTEO affects muscular adaptation in a way that improves performance in well-trained female volleyball players.
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Affiliation(s)
- Jiaoqin Wang
- Capital University of Physical Education and Sports, Beijing, China
- Beijing Sport University, Beijing, China
| | - Qiang Zhang
- Capital University of Physical Education and Sports, Beijing, China
| | | | - Honghao Fu
- Huazhong University of Science and Technology, Wuhan, China
| | - Ming Zhang
- Beijing Sport University, Beijing, China
| | - Yongzhao Fan
- Department of Physical Education, Henan Normal University, Xinxiang, China
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Beato M, de Keijzer KL, Muñoz-Lopez A, Raya-González J, Pozzo M, Alkner BA, Dello Iacono A, Vicens-Bordas J, Coratella G, Maroto-Izquierdo S, Gonzalo-Skok O, McErlain-Naylor SA, Martin-Rivera F, Hernandez-Davo JL, Arrones LS, Sabido R, de Hoyo M, Fernandez-Gonzalo R, Norrbrand L. Current Guidelines for the Implementation of Flywheel Resistance Training Technology in Sports: A Consensus Statement. Sports Med 2024; 54:541-556. [PMID: 38175461 PMCID: PMC10978721 DOI: 10.1007/s40279-023-01979-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2023] [Indexed: 01/05/2024]
Abstract
BACKGROUND Flywheel resistance training has become more integrated within resistance training programs in a variety of sports due to the neuromuscular, strength, and task-specific enhancements reported with this training. OBJECTIVE This paper aimed to present the consensus reached by internationally recognized experts during a meeting on current definitions and guidelines for the implementation of flywheel resistance training technology in sports. METHODS Nineteen experts from different countries took part in the consensus process; 16 of them were present at the consensus meeting (18 May 2023) while three submitted their recommendations by e-mail. Prior to the meeting, evidence summaries were developed relating to areas of priority. This paper discusses the available evidence and consensus process from which recommendations were made regarding the appropriate use of flywheel resistance training technology in sports. The process to gain consensus had five steps: (1) performing a systematic review of systematic reviews, (2) updating the most recent umbrella review published on this topic, (3) first round discussion among a sample of the research group included in this consensus statement, (4) selection of research group members-process of the consensus meeting and formulation of the recommendations, and (5) the consensus process. The systematic analysis of the literature was performed to select the most up-to-date review papers available on the topic, which resulted in nine articles; their methodological quality was assessed according to AMSTAR 2 (Assessing the Methodological Quality of Systematic Review 2) and GRADE (Grading Recommendations Assessment Development and Evaluation). Statements and recommendations scoring 7-9 were considered appropriate. RESULTS The recommendations were based on the evidence summary and researchers' expertise; the consensus statement included three statements and seven recommendations for the use of flywheel resistance training technology. These statements and recommendations were anonymously voted on and qualitatively analyzed. The three statements reported a score ranging from 8.1 to 8.8, and therefore, all statements included in this consensus were considered appropriate. The recommendations (1-7) had a score ranging from 7.7 to 8.6, and therefore, all recommendations were considered appropriate. CONCLUSIONS Because of the consensus achieved among the experts in this project, it is suggested that practitioners and researchers should adopt the guidelines reported in this consensus statement regarding the use of flywheel resistance technology in sports.
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Affiliation(s)
- Marco Beato
- School of Allied Health Sciences, University of Suffolk, Ipswich, UK.
| | | | - Alejandro Muñoz-Lopez
- Departamento de Motricidad Humana y Rendimiento Deportivo, University of Seville, Seville, Spain
| | | | - Marco Pozzo
- Master de Fútbol, Universidad Pablo de Olavide, Seville, Spain
- SmartCoach Technologies, Inc., Seville, Spain
| | - Björn A Alkner
- Department of Orthopaedic Surgery, Eksjö, Region Jönköping County, Sweden
- Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Antonio Dello Iacono
- School of Health and Life Sciences, University of the West of Scotland, Paisley, Scotland
| | - Jordi Vicens-Bordas
- Sport, Exercise, and Human Movement (SEaHM), University of Vic-Central University of Catalonia, Barcelona, Spain
- Sport and Physical Activity Studies Centre (CEEAF), University of Vic-Central University of Catalonia, Barcelona, Spain
| | - Giuseppe Coratella
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | | | - Oliver Gonzalo-Skok
- Department of Communication and Education, Universidad Loyola Andalucía, Seville, Spain
| | | | - Fernando Martin-Rivera
- Research Group in Prevention and Health in Exercise and Sport, University of Valencia, Valencia, Spain
| | | | | | - Rafael Sabido
- Sport Research Centre, Department of Sport Sciences, Miguel Hernández University, Elche, Spain
| | - Moises de Hoyo
- Department of Physical Education and Sport, University of Seville, Seville, Spain
- Performance Department, Aston Villa Football Club, Birmingham, UK
| | - Rodrigo Fernandez-Gonzalo
- Department of Laboratory Medicine, Division of Clinical Physiology, Karolinska Institutet, Stockholm, Sweden
- Unit of Clinical Physiology, Karolinska University Hospital, Stockholm, Sweden
| | - Lena Norrbrand
- Division of Environmental Physiology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Solna, Sweden
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Bright TE, Handford MJ, Mundy P, Lake J, Theis N, Hughes JD. Building for the Future: A Systematic Review of the Effects of Eccentric Resistance Training on Measures of Physical Performance in Youth Athletes. Sports Med 2023; 53:1219-1254. [PMID: 37097414 PMCID: PMC10185653 DOI: 10.1007/s40279-023-01843-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/17/2023] [Indexed: 04/26/2023]
Abstract
BACKGROUND Eccentric resistance training is recognised as an effective stimulus for enhancing measures of muscular strength and power in adult populations; however, its value in youth athletes is currently not well understood. OBJECTIVE The aim of this systematic review was to critically appraise the effects of eccentric resistance training on measures of physical performance (i.e. muscular strength, jump, sprint and change of direction) in youth athletes 18 years of age and under. METHODS Original journal articles published between 1950 and June 2022 were retrieved from electronic search engines of PubMed, SPORTDiscus and Google Scholar's advanced search option. Full journal articles investigating the acute and chronic effects of eccentric resistance training on measures of physical performance in youth athletes (i.e. a person 18 years of age or under who competes in sport) were included. The methodological quality and bias of each study were assessed prior to data extraction using a modified Downs and Black checklist. RESULTS The search yielded 749 studies, of which 436 were duplicates. Three-hundred studies were excluded based upon title and abstract review and a further 5 studies were removed following the modified Downs and Black checklist. An additional 14 studies were identified during backward screening. Accordingly, 22 studies were included in our systematic review. The Nordic hamstring exercise and flywheel inertial training were the most frequently used eccentric resistance training methods in youth athletes. Improvements in physical performance following the Nordic hamstring exercise are dependent upon an increase in the breakpoint angle, rather than training volume (sets and repetitions), and are further elevated with the addition of hip extension exercises or high-speed running. A minimum of 3 familiarisation trials is necessary to elicit meaningful adaptations following flywheel inertial training. Furthermore, an emphasis should be placed upon decelerating the rotating flywheel during the final one to two thirds of the eccentric phase, rather than gradually throughout the entire eccentric phase. CONCLUSIONS The findings of this systematic review support the inclusion of eccentric resistance training in youth athletes to improve measures of muscular strength, jump, sprint and change of direction performance. The current eccentric resistance training methods are predominantly limited to the Nordic hamstring exercise and flywheel inertial training; however, the efficacy of accentuated eccentric loading to improve jump performance warrants attention in future investigations.
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Affiliation(s)
- Thomas E. Bright
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UK
- School of Sport, Health and Wellbeing, Plymouth Marjon University, Derriford Rd, Plymouth, PL6 8BH UK
| | - Matthew J. Handford
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UK
| | | | - Jason Lake
- Department of Sport and Exercise Sciences, Chichester University, Chichester, UK
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA Australia
| | - Nicola Theis
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UK
| | - Jonathan D. Hughes
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UK
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Concentric Phase Assistance Enhances Eccentric Peak Power During Flywheel Squats: Intersession Reliability and the Linear Relationship Between Concentric and Eccentric Phases. Int J Sports Physiol Perform 2023; 18:428-434. [PMID: 36863353 DOI: 10.1123/ijspp.2022-0349] [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: 09/19/2022] [Revised: 11/22/2022] [Accepted: 12/26/2022] [Indexed: 03/04/2023]
Abstract
BACKGROUND It remains unknown if flywheel-assisted squats can be reliably utilized to increase power outputs and if such outputs are related. OBJECTIVES To compare assisted and unassisted flywheel squat peak power outputs, determine their reliability, and analyze the relationship of the delta difference between peak power outputs during the squats. METHODS Twenty male athletes attended the laboratory 6 times-performing 3 sets of 8 repetitions of assisted and unassisted squats during 2 familiarization sessions and then 3 sets of 8 repetitions during experimental sessions 3 to 6 (2 sessions for unassisted and assisted squat in randomized order, respectively). RESULTS Concentric and eccentric peak power were significantly greater during assisted squats (both P < .001, d = 1.59, d = 1.57, respectively). Rating of perceived exertion (P = .23) and eccentric:concentric ratio (P = .094) did not differ between squat conditions. Peak power measures obtained excellent reliability, while rating of perceived exertion and eccentric:concentric ratio estimates were rated as acceptable to good, with greater uncertainty. A large to very large correlation (r = .77) was found between concentric and eccentric peak power delta difference of assisted and unassisted squats. CONCLUSIONS Greater concentric outputs during assisted squats induce greater eccentric outputs and obtain greater mechanical load. Peak power is a reliable metric for monitoring flywheel training, whereas the eccentric:concentric ratio should be used with caution. Eccentric and concentric peak power are strongly related during flywheel squats, evidencing the need to maximize the concentric output to enhance the eccentric output.
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Flywheel eccentric overload exercises versus barbell half squats for basketball players: Which is better for induction of post-activation performance enhancement? PLoS One 2022; 17:e0277432. [PMID: 36409686 PMCID: PMC9678314 DOI: 10.1371/journal.pone.0277432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 10/27/2022] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE This study compared the post-activation performance enhancement (PAPE) effects of a flywheel eccentric overload (FEOL) exercise and barbell half squats (BHS) on countermovement jump (CMJ) and 30 m sprint performance. METHODS Twelve male collegiate competitive basketball players were enrolled in this study and they implemented two training protocols: barbell half squat (BHS) and flywheel eccentric overload (FEOL) training. The BHS protocol included three intensities of load: low (40% 1RM), medium (60% 1RM), and high (80% 1RM), with each intensity consisting of 5 sets of 3 repetitions. The FEOL protocol included three inertia intensities: low (0. 015 kg∙m2), medium (0.035 kg∙m2), and high (0.075 kg∙m2), with each intensity consisting of 3 sets of 6 repetitions. The measurement time points were before training (baseline) and at 3, 6, 9, and 12 minutes after training. A two-stage (stage-I and stage-II) randomized crossover design was used to determine the acute effects of both protocols on CMJ and sprint performance. RESULTS At each training intensity, the jump height, jump peak power output (PPO), jump impulse and 30m sprint speed at 3, 6, 9, and 12 minutes after BHS and FEOL training did not change significantly compared to the baseline. A 2-way ANOVA analysis indicated significant main effects of rest intervals on jump height, jump PPO, and jump impulse, as well as 30m sprint speed. The interaction of the Time × protocol showed a significant effect on jump height between BHS and FEOL groups at high intensity in stage-I (F = 3.809, p = 0.016, df = 4) and stage-II (F = 3.044, p = 0.037, df = 4). And in high training intensity, the jump height at 3 (7.78 ± 9.90% increase, ES = 0.561), 6 (8.96 ± 12.15% increase, ES = 0.579), and 9 min (8.78 ± 11.23% increase, ES = 0.608) were enhanced in I-FEOL group compared with I-BHS group (F = 3.044, p = 0.037, df = 4). In stage-II, the impulse and sprint speed of the FEOL group were significantly higher than those of the BHS group at 6, 9, and 12 min under low (FEOL = 0.015kg∙m2, BHS = 40%1RM), medium(FEOL = 0.035kg∙m2, BHS = 60%1RM), and high (FEOL = 0.075kg∙m2, BHS = 80%1RM) intensities. Furthermore, the sprint speed of the two training protocols did not change at different time points. The interaction of Time × training intensity showed lower sprint speeds in the II-BHS group at a high intensity (BHS = 80%1RM) compared to low (BHS = 40%1RM) and medium (BHS = 60%1RM) training intensities, especially at 9 min and 12 min rest intervals. CONCLUSION Although barbell half squat training and flywheel eccentric overload training did not provide a significant PAPE effect on explosive power (CMJ and sprint) in male basketball players, FEOL training showed a better potential effect on enhanced CMJ jump performance at the high training intensity.
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Martín-Rivera F, Beato M, Alepuz-Moner V, Maroto-Izquierdo S. Use of concentric linear velocity to monitor flywheel exercise load. Front Physiol 2022; 13:961572. [PMID: 36035469 PMCID: PMC9412162 DOI: 10.3389/fphys.2022.961572] [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: 06/04/2022] [Accepted: 07/18/2022] [Indexed: 11/13/2022] Open
Abstract
Purpose: To propose the concentric linear velocity measurement as a valid method to quantify load and individualise the prescription of flywheel training, we investigated the relationship between inertial load and mean concentric linear velocity (MCLV) during the flywheel squat exercise in a wide spectrum of intensities. In addition, we compared MCLV and subjective rating of perceived exertion (RPE) after each load. Methods: Twenty-five physically active men volunteered for this study (26.5 ± 2.9 years, 179.5 ± 4.2 cm, 81.6 ± 8.6 kg). After familiarization, all participants performed two inertial progressive load tests on separated days to determine the flywheel load-velocity profile and its reliability. Each participant performed 5 set of 6 repetitions of the flywheel squat exercise with different inertial loads (0.047, 0.104, 0.161, 0.245, 0.321 kg m2) selected in a counterbalanced and randomized order for each testing day. Average MCLV and RPE for each load were compared. Results: The inter-session intraclass correlation coefficient (ICC) showed values above 0.9 in all the included outcomes (MCLV: ICC = 0.91; RPE: ICC = 0.93). A significant correlation (p < 0.01, R2 = 0.80) between inertial load and MCLV was found. Similarly, significant correlation models (p < 0.01) were observed between RPE and load (R2 = 0.87) and (R2 = 0.71) between RPE and MCLV. Conclusion: The control of MCLV during flywheel exercise can be proposed as a valid method to quantify load and to individualize the prescription of flywheel training. In addition, RPE responses have demonstrated significant correlations with load and velocity. Therefore, RPE has been proposed as a valid and reliable alternative to control flywheel training.
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Affiliation(s)
- Fernando Martín-Rivera
- Research Group in Prevention and Health in Exercise and Sport, University of Valencia, Valencia, Spain
- *Correspondence: Fernando Martín-Rivera,
| | - Marco Beato
- School of Health and Sports Sciences, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
| | | | - Sergio Maroto-Izquierdo
- Department of Health Sciences, European University Miguel de Cervantes, Valladolid, Spain
- Proporción A, Applied Sports Science Centre, Valladolid, Spain
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de Keijzer KL, McErlain-Naylor SA, Beato M. The Effect of Flywheel Inertia on Peak Power and Its Inter-session Reliability During Two Unilateral Hamstring Exercises: Leg Curl and Hip Extension. Front Sports Act Living 2022; 4:898649. [PMID: 35755611 PMCID: PMC9226424 DOI: 10.3389/fspor.2022.898649] [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: 03/17/2022] [Accepted: 04/28/2022] [Indexed: 12/05/2022] Open
Abstract
This study investigated the effect of flywheel moment of inertia (0.029, 0.061, and 0.089 kg·m2) on concentric and eccentric peak power and eccentric:concentric peak power ratio during unilateral flywheel leg curl and hip extension exercises. Moreover, the inter-session reliability of peak power was analyzed during both exercises. Twenty amateur male soccer athletes attended five visits-performing three sets of eight repetitions of either unilateral leg curl or hip extension (all three moments of inertias) during each visit. For the unilateral leg curl, there were no differences in any measure between moments of inertia (p = 0.479) but a higher eccentric than concentric peak power for all moments of inertia (p < 0.001). For the unilateral hip extension, differences between moments of inertia were reported for all measures (p < 0.05). Specifically, the lowest moment of inertia elicited the greatest concentric peak power (p = 0.022), there were no differences with the medium inertia (p = 0.391), and the greatest moment of inertia obtained the greatest eccentric peak power (p = 0.036). Peak power measures obtained acceptable to excellent reliability while the eccentric:concentric ratio reported unacceptable to good reliability for both exercises. A variety of moments of inertia can elicit high eccentric knee flexor demands during unilateral leg curls, whereas higher moments of inertia are needed to achieve an eccentric-overload in peak power during hip extensions. Different exercises may have different inertia-power relationships. Concentric and eccentric peak power measures should continue to inform training, while the eccentric:concentric ratio should not be used.
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Affiliation(s)
- Kevin L. de Keijzer
- School of Health and Sport Sciences, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
| | - Stuart A. McErlain-Naylor
- School of Health and Sport Sciences, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
- School of Sport, Exercise and Health Sciences, Loughborough, United Kingdom
| | - Marco Beato
- School of Health and Sport Sciences, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
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Bollinger LM, Brantley JT, Carpenter RS, Haydon MA, Best S, Abel MG. Quadriceps electromyography during flywheel-based inertial training (FIT) and dynamic constant external resistance (DCER) squats at similar tempo. Sports Biomech 2022:1-12. [PMID: 35549814 DOI: 10.1080/14763141.2022.2071330] [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: 07/15/2021] [Accepted: 04/22/2022] [Indexed: 10/18/2022]
Abstract
Flywheel-based iso-inertial training (FIT) has been purported to provide enhanced adaptations to muscle overload compared to dynamic constant external resistance (DCER), but previous studies have not controlled for exercise intensity. We compared quadriceps electromyography (EMG) amplitude between FIT- and DCER-squats with similar tempo. Eleven (5 M and 6F) resistance-trained participants completed sets of five maximal velocity FIT (0.025 kg∙m2) and DCER (55 ± 15 %1RM) squats. Sagittal plane knee joint angles and surface EMG activity of the vastus lateralis (VL), vastus medialis (VM) and rectus femoris (RF) were measured. Repetition time and peak knee angles were similar between FIT and DCER squats. Mean knee angular velocity during the concentric (122.2 ± 23.6 vs. 108.9 ± 22.9, p = 0.022, Cohen's D: 0.820), but not eccentric, phase was significantly greater during FIT. Peak VM (210.4 ± 49.3 vs. 177.5 ± 56.3 %MVIC, p = 0.001; Cohen's D: 1.416), but not VL or RF, EMG amplitude was significantly greater in FIT compared to DCER. Mean EMG amplitude was significantly (p < 0.001) greater during the concentric than the eccentric phase for the VL and VM but not RF. Mean EMG amplitude was not significantly different between modes during either the concentric or eccentric phase. Quadriceps EMG amplitude is largely similar between FIT and DCER squats when matched for movement velocity.
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Affiliation(s)
- Lance M Bollinger
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington U.S.A
| | - Jason T Brantley
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington U.S.A
| | - Rebekah S Carpenter
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington U.S.A
| | - Mariam A Haydon
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington U.S.A
| | - Stuart Best
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington U.S.A
| | - Mark G Abel
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington U.S.A
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de Keijzer KL, Gonzalez JR, Beato M. The effect of flywheel training on strength and physical capacities in sporting and healthy populations: An umbrella review. PLoS One 2022; 17:e0264375. [PMID: 35213634 PMCID: PMC8880830 DOI: 10.1371/journal.pone.0264375] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 02/09/2022] [Indexed: 01/08/2023] Open
Abstract
The aim of this umbrella review was to provide a detailed summary of how flywheel training enhances strength and physical capacities in healthy and athletic populations. The eleven reviews included were analyzed for methodological quality according to the Assessing the Methodological Quality of Systematic Review 2 (AMSTAR 2) and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) criteria. Two were systematic reviews, six were systematic reviews with meta-analyses and three were narrative reviews. Although the included reviews support use of flywheel training with athletic and healthy populations, the umbrella review highlights disparity in methodological quality and over-reporting of studies (38 studies were included overall). Flywheel post-activation performance enhancement protocols can effectively enhance strength and physical capacities acutely with athletes and healthy populations. All relevant reviews support flywheel training as a valid alternative to traditional resistance training for enhancing muscular strength, power, and jump performance with untrained and trained populations alike. Similarly, reviews included report flywheel training enhances change of direction performance—although conclusions are based on a limited number of investigations. However, the reviews investigating the effect of flywheel training on sprint performance highlight some inconsistency in attained improvements with elite athletes (e.g., soccer players). To optimize training outcomes, it is recommended practitioners individualize (i.e., create inertia-power or inertia-velocity profiles) and periodize flywheel training using the latest guidelines. This umbrella review provides an analysis of the literature’s strengths and limitations, creating a clear scope for future investigations.
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Affiliation(s)
- Kevin L. de Keijzer
- School of Health and Sports Science, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
| | | | - Marco Beato
- School of Health and Sports Science, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
- * E-mail:
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Muñoz-López A, Floría P, Sañudo B, Pecci J, Carmona Pérez J, Pozzo M. The Maximum Flywheel Load: A Novel Index to Monitor Loading Intensity of Flywheel Devices. SENSORS (BASEL, SWITZERLAND) 2021; 21:8124. [PMID: 34884128 PMCID: PMC8662394 DOI: 10.3390/s21238124] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/26/2021] [Accepted: 12/02/2021] [Indexed: 11/16/2022]
Abstract
BACKGROUND The main aim of this study was (1) to find an index to monitor the loading intensity of flywheel resistance training, and (2) to study the differences in the relative intensity workload spectrum between the FW-load and ISO-load. METHODS twenty-one males participated in the study. Subjects executed an incremental loading test in the squat exercise using a Smith machine (ISO-load) or a flywheel device (FW-load). We studied different association models between speed, power, acceleration, and force, and each moment of inertia was used to find an index for FW-load. In addition, we tested the differences between relative workloads among load conditions using a two-way repeated-measures test. RESULTS the highest r2 was observed using a logarithmic fitting model between the mean angular acceleration and moment of inertia. The intersection with the x-axis resulted in an index (maximum flywheel load, MFL) that represents a theoretical individual maximal load that can be used. The ISO-load showed greater speed, acceleration, and power outcomes at any relative workload (%MFL vs. % maximum repetition). However, from 45% of the relative workload, FW-load showed higher vertical forces. CONCLUSIONS MFL can be easily computed using a logarithmic model between the mean angular acceleration and moment of inertia to characterize the maximum theoretical loading intensity in the flywheel squat.
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Affiliation(s)
- Alejandro Muñoz-López
- Departamento de Motricidad Humana y Rendimiento Deportivo, University of Seville, 41013 Seville, Spain;
| | - Pablo Floría
- Physical Performance and Sports Research Center, Universidad Pablo de Olavide, 41013 Seville, Spain;
| | - Borja Sañudo
- Department of Physical Education, University of Seville, 41013 Seville, Spain; (B.S.); (J.P.)
| | - Javier Pecci
- Department of Physical Education, University of Seville, 41013 Seville, Spain; (B.S.); (J.P.)
| | - Jorge Carmona Pérez
- Departamento de Motricidad Humana y Rendimiento Deportivo, University of Seville, 41013 Seville, Spain;
| | - Marco Pozzo
- SmartCoach Europe AB, 118 20 Stockholm, Sweden;
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Beato M, Maroto-Izquierdo S, Hernández-Davó JL, Raya-González J. Flywheel Training Periodization in Team Sports. Front Physiol 2021; 12:732802. [PMID: 34819871 PMCID: PMC8606557 DOI: 10.3389/fphys.2021.732802] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 10/06/2021] [Indexed: 12/29/2022] Open
Affiliation(s)
- Marco Beato
- School of Health and Sports Sciences, University of Suffolk, Ipswich, United Kingdom.,Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
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Assessment and Evaluation of Force–Velocity Variables in Flywheel Squats: Validity and Reliability of Force Plates, a Linear Encoder Sensor, and a Rotary Encoder Sensor. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app112210541] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Research into flywheel (FW) resistance training and force–velocity–power (F–v–P) profiling has recently gained attention. Ground reaction force (GRF) and velocity (v) during FW squats can be predicted from shaft rotational data. Our study aimed to compare the inter-set reliability of GRF, v, and F–v–P relationship output variables calculated from force plates and linear encoder (presumed gold-standard) and rotary encoder data. Fifty participants performed two sets of FW squats at four inertias. Peak and mean concentric and eccentric GRF, v, and F–v–P outcomes from mean variables during the concentric phase of the squat were calculated. Good to excellent reliability was found for GRF and v (ICC > 0.85), regardless of the measure and the variable type. The F–v–P outcomes showed moderate to good reliability (ICC > 0.74). Inter-measure bias (p < 0.05) was found in the majority of GRF and v variables, as well as for all the calculated F–v–P outcomes (trivial to large TEs) with very large to perfect correlations for v (r 0.797–0.948), GRF (r 0.712–0.959), and, finally, F–v–P outcomes (ICC 0.737–0.943). Rotary encoder overestimated the force plates and linear encoder variables, and the differences were dependent on the level of inertia. Despite high reliability, FW device users should be aware of the discrepancy between the measures.
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Maroto-Izquierdo S, Raya-González J, Hernández-Davó JL, Beato M. Load Quantification and Testing Using Flywheel Devices in Sports. Front Physiol 2021; 12:739399. [PMID: 34777007 PMCID: PMC8587883 DOI: 10.3389/fphys.2021.739399] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 09/29/2021] [Indexed: 12/02/2022] Open
Affiliation(s)
| | | | | | - Marco Beato
- School of Health and Sports Sciences, University of Suffolk, Ipswich, United Kingdom
- Institute of Health and Wellbeing, University of Suffolk, Ipswich, United Kingdom
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Post Flywheel Squat Potentiation of Vertical and Horizontal Ground Reaction Force Parameters during Jumps and Changes of Direction. Sports (Basel) 2021; 9:sports9010005. [PMID: 33466258 PMCID: PMC7824739 DOI: 10.3390/sports9010005] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/19/2020] [Accepted: 12/31/2020] [Indexed: 11/23/2022] Open
Abstract
(1) Background: The aim of the study was to determine the post-activation performance enhancement (PAPE) of vertical and horizontal ground reaction force parameters during jumps and change of direction following flywheel squat exercise using two different flywheel inertias. (2) Methods: Eleven male athletes performed a countermovement jump (CMJ), standing broad jump (SBJ), and “modified 505” change of direction (COD) in a control condition and 6 minutes following three sets of six repetitions of flywheel half squats at one of two inertias (0.029 kg·m2 and 0.061 kg·m2). Peak directional ground reaction force, power, and rate of force development were calculated for each test. (3) Results: Higher inertia flywheel squats were able to acutely enhance CMJ peak vertical force (Bayes Factor (BF10) = 33.5, very strong; δ = 1.66; CI: 0.67, 2.70), whereas lower inertia flywheel squats were able to acutely enhance CMJ peak vertical power (BF10 = 3.65, moderate; δ = 0.93; CI: 0.11, 1.88). The vertical squat exercise induced no PAPE effect on resultant SBJ or horizontal COD ground reaction force parameters, nor were any differences observed between the inertias. (4) Conclusions: Researchers and practitioners should consider the kinetic and kinematic correspondence of a pre-load stimulus to the subsequent sport-specific activity (i.e., flywheel squat to CMJ).
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