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Burton I, McCormack A. Nutritional Supplements in the Clinical Management of Tendinopathy: A Scoping Review. J Sport Rehabil 2023:1-12. [PMID: 37146985 DOI: 10.1123/jsr.2022-0244] [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: 06/26/2022] [Revised: 01/02/2023] [Accepted: 02/24/2023] [Indexed: 05/07/2023]
Abstract
INTRODUCTION Tendinopathy has a high prevalence and incidence in the general population and among athletes, with a lack of consensus among medical practitioners on optimal management strategies. The objective of this scoping review was to evaluate current research on the use of nutritional supplements for treating tendinopathies, including what supplements have been used and what outcomes, outcome measures, and intervention parameters have been reported. METHODS Databases searched included Embase, SPORTDiscus, the Cochrane Library, MEDLINE, CINAHL, and AMED. This scoping review considered primary studies investigating nutritional supplements for tendinopathies and was reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analysis Extension for Scoping Reviews. RESULTS A total of 1527 articles were identified with 16 included in the review. Studies investigated a range of nutritional supplements in the clinical management of various tendinopathies, including several commercially available proprietary blends of several ingredients. TendoActive (mucopolysaccharides, type I collagen, and vitamin C) was used in 2 studies, TENDISULFUR (methylsulfonylmethane, hydrolyzed collagen, L-arginine, L-lysine, vitamin C, bromelain, chondroitin, glucosamine, Boswellia, and myrrh) was used in 3 studies, and Tenosan (arginine-L-alpha ketoglutarate, hydrolyzed collagen type I, methylsulfonylmethane, vitamin C, bromelain, and vinitrox) was used in 2 studies. Collagen peptides were used in 2 studies, with omega-3 fatty acids, combined fatty acids and antioxidants, turmeric rhizome combined with Boswellia, β-hydroxy β-methylbutyric, vitamin C in isolation and combined with gelatin, and creatine investigated in one study each. CONCLUSION Despite a paucity of studies to date, findings from this review suggest that several nutritional compounds may be beneficial in the clinical management of tendinopathies, by exerting anti-inflammatory effects and improving tendon healing. Nutritional supplements may have potential as an adjunctive method to standard treatment methods such as exercise, where their pain-relieving, anti-inflammatory, and structural tendon effects may augment the positive functional outcomes gained from progressive exercise rehabilitation.
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Affiliation(s)
- Ian Burton
- Portlethen Medical Centre, Aberdeenshire, NHS Grampian, Aberdeen,United Kingdom
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Sikes KJ, McConnell A, Serkova N, Cole B, Frisbie D. Untargeted metabolomics analysis identifies creatine, myo-inositol, and lipid pathway modulation in a murine model of tendinopathy. J Orthop Res 2022; 40:965-976. [PMID: 34081345 PMCID: PMC8639838 DOI: 10.1002/jor.25112] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 05/12/2021] [Accepted: 05/31/2021] [Indexed: 02/04/2023]
Abstract
Tendinopathy has been broadly characterized as alterations in cell proliferation, extracellular matrix turnover/synthesis, and inflammatory alterations. However, the underlying glucose metabolism pathways which contribute to these responses have not been well explored. The potential link between glucose metabolism and tendon pathology is interesting from a global standpoint since the development of spontaneous tendinopathy is associated with systemic metabolic disorders including diabetes mellitus. Therefore, the overarching goal of this study was to understand the potential pathogenic role of glucose metabolism-driven mechanisms in the development of tendinopathy. To test this, we have utilized an untargeted metabolomics approach to discover pathways which may be altered following tendinopathic injury and treadmill running in an established murine model of TGF-β1 induced tendinopathy. While specific tendon glucose alterations were not observed via metabolomics or 18 F-fluoroeoxyglucose (FDG) positron emission tomography/microcomputed tomography imaging (18 F-FDG PET/CT), metabolites including creatinine, D-chiro-inositol, and lipids were dysregulated following tendon injury. As novel pathways for manipulation, the creatine pathway, myo-inositol pathway, and lipid signaling may lead to the development of enhanced preventative strategies and therapeutic options for all patients who suffer from tendon-related injuries.
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Affiliation(s)
- Katie J. Sikes
- Orthopaedic Research Center, Department of Clinical Sciences, Colorado State University, Fort Collins, CO 80523
| | - Anna McConnell
- Orthopaedic Research Center, Department of Clinical Sciences, Colorado State University, Fort Collins, CO 80523
| | - Natalie Serkova
- Department of Radiology, University of Colorado Denver, Denver, CO 80045
| | - Brian Cole
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL 60612
| | - David Frisbie
- Orthopaedic Research Center, Department of Clinical Sciences, Colorado State University, Fort Collins, CO 80523
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Muanjai P, Mickevicius M, Snieckus A, Jones DA, Zachovajevas P, Satkunskiene D, Venckunas T, Kamandulis S. Response of Knee Extensor Muscle-Tendon Unit Stiffness to Unaccustomed and Repeated High-Volume Eccentric Exercise. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18094510. [PMID: 33922796 PMCID: PMC8122999 DOI: 10.3390/ijerph18094510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/16/2021] [Accepted: 04/22/2021] [Indexed: 12/20/2022]
Abstract
The purposes of this study were to investigate the muscle-tendon unit stiffness response and to compare the stiffness with those of other indirect markers induced by two bouts of unaccustomed eccentric exercise. Eleven untrained men performed two bouts of 200 maximal eccentric contractions of the right quadriceps 4 weeks apart. Changes in stiffness, pain evoked by stretching and pressure, plasma creatine kinase (CK) activity, and muscle thickness were followed for 7 days after each bout. Stiffness and pain peaked immediately and 1 day after the first exercise bout, whereas CK and thickness were highest 4 and 7 days after the first exercise bout, respectively (p < 0.05 for all). Muscular pain, thickness, and stiffness responses were lower by 53.3%, 99%, and 11.6%, respectively, after the repeated bout compared to after the first bout (p < 0.05 for all), while CK activity response did not differ significantly between bouts. High responders for an increase in muscle-tendon unit stiffness showed a repeated-bout effect for stiffness, pain, and CK activity (by 29%, 65%, and 98%, p < 0.05 for all), but the repeated-bout effect was not that clear in low responders. These findings suggest that a repeated eccentric exercise bout effect on stiffness in quadriceps is mostly not associated with muscle pain and CK activity, but there are large individual differences.
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Affiliation(s)
- Pornpimol Muanjai
- Department of Physical Therapy, Allied Health Sciences Faculty, Burapha University, Chonburi 20131, Thailand
- Exercise and Nutrition Innovation and Sciences Research Unit, Burapha University, Chonburi 20131, Thailand
- Correspondence:
| | - Mantas Mickevicius
- Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania; (M.M.); (A.S.); (D.A.J.); (D.S.); (T.V.); (S.K.)
| | - Audrius Snieckus
- Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania; (M.M.); (A.S.); (D.A.J.); (D.S.); (T.V.); (S.K.)
| | - David A. Jones
- Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania; (M.M.); (A.S.); (D.A.J.); (D.S.); (T.V.); (S.K.)
- School of Healthcare Sciences, Manchester Metropolitan University, Manchester M15 6BH, UK
| | - Pavelas Zachovajevas
- Department of Applied Biology and Rehabilitation, Lithuanian Sports University, 44221 Kaunas, Lithuania;
| | - Danguole Satkunskiene
- Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania; (M.M.); (A.S.); (D.A.J.); (D.S.); (T.V.); (S.K.)
| | - Tomas Venckunas
- Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania; (M.M.); (A.S.); (D.A.J.); (D.S.); (T.V.); (S.K.)
| | - Sigitas Kamandulis
- Institute of Sport Science and Innovations, Lithuanian Sports University, 44221 Kaunas, Lithuania; (M.M.); (A.S.); (D.A.J.); (D.S.); (T.V.); (S.K.)
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Removal of roosters alters the domestic phenotype and microbial and genetic profile of hens. SCIENCE CHINA-LIFE SCIENCES 2021; 64:1964-1976. [PMID: 33587265 DOI: 10.1007/s11427-020-1770-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/14/2020] [Indexed: 12/15/2022]
Abstract
Hens are raised apart from roosters in modern poultry production, a substantial change from their natural social structure. We compared productivity, injuries, behavior, physiology, microbiome and transcriptome of hens housed with (R+) or without (R-) roosters to quantify the effects of this change in social structure. Hens were raised free-range from 70 to 280 days when 30 birds per treatment were assigned to battery cages until Day 315 (R+C vs. R-C), while 30 birds per treatment remained in free-range pens (R+F vs. R-F). Response to a novel environment and object, behavioral time budgets, cecum microbiome, blood composition and transcriptomic sequencing of thigh muscle and spleen were analyzed. Hens housed without roosters showed better survival, consumed less food, produced more eggs and had better feed conversion. R+F hens clustered around the rooster and were less mobile in the novel environment and object tests. R+F hens displayed the richest microbiome, and the presence of roosters resulted in differentially expressed genes related to muscle development, cellular processes, environmental information processing and immune function. Removing roosters from housed hens intensified desirable characteristics favored by domestication probably operating by deprivation of mating behavior and reduced fear, along with altered microbial and genetic function.
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Ho CC, Nosaka K, Tseng KW, Tseng WC, Lau WY, Bogdanis GC, Chen TC. Effect of preconditioning exercise on biceps brachii myotendinous junction displacement during elbow flexor eccentric exercise. Scand J Med Sci Sports 2020; 31:813-825. [PMID: 33349963 DOI: 10.1111/sms.13911] [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: 08/22/2020] [Revised: 12/16/2020] [Accepted: 12/17/2020] [Indexed: 11/29/2022]
Abstract
The present study tested the hypothesis that 30 low-intensity (10%) eccentric contractions (10%EC) or two maximal voluntary isometric contractions at a long muscle length (2MVIC) that were performed at two days before maximal eccentric exercise of the elbow flexors consisting of five sets of six maximal eccentric contractions (MaxEC) would reduce increases in biceps brachii distal myotendinous junction displacement (MTJd) over the eccentric contractions during MaxEC. Sedentary young men were randomly placed (n = 12/group) to a control group that performed two bouts of MaxEC (CONT-1st, CONT-2nd) separated by two weeks, or one of two preconditioning groups that performed 10%EC or 2MVIC at 20° elbow flexion at two days prior to MaxEC. All exercises were performed by the non-dominant arm. MTJd of each contraction was assessed by B-mode ultrasound, and its changes over sets were compared among the groups. The average MTJd from the start to the end of six eccentric contractions in the first set was similar among the groups (6.4 ± 0.7 mm). The MTJd increased from the first to fifth set, but the increase was smaller (P < .05) for the 10%EC (13 ± 6%) and 2MVIC (16 ± 9%) groups, and CONT-2nd (3 ± 6%) when compared with CONT-1st (60 ± 12%). Both 10%EC and 2MVIC groups showed smaller (P < .05) changes in all muscle damage markers after MaxEC similarly when compared with CONT-1st, but the changes were greater than those after CONT-2nd. These results supported the hypothesis that protective effect was associated with less MTJd changes, suggesting that this is associated with the mechanisms underpinning the preconditioning effect on muscle damage.
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Affiliation(s)
- Chih-Chiao Ho
- Department of Physical Education, National Taiwan Normal University, Taipei City, Taiwan
| | - Kazunori Nosaka
- School of Medical and Health Sciences, Centre for Exercise and Sports Science Research, Edith Cowan University, Joondalup, WA, Australia
| | - Kou-Wei Tseng
- Department of Exercise and Health Science, University of Taipei, Taipei City, Taiwan
| | - Wei-Chin Tseng
- Department of Exercise and Health Science, University of Taipei, Taipei City, Taiwan
| | - Wing-Yin Lau
- School of Medical and Health Sciences, Centre for Exercise and Sports Science Research, Edith Cowan University, Joondalup, WA, Australia
| | - Gregory C Bogdanis
- School of P.E. & Sport Science, National & Kapodistrian University of Athens, Athens, Greece
| | - Trevor C Chen
- Department of Physical Education, National Taiwan Normal University, Taipei City, Taiwan
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Margaritelis NV, Theodorou AA, Chatzinikolaou PN, Kyparos A, Nikolaidis MG, Paschalis V. Eccentric exercise per se does not affect muscle damage biomarkers: early and late phase adaptations. Eur J Appl Physiol 2020; 121:549-559. [PMID: 33156414 DOI: 10.1007/s00421-020-04528-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 10/07/2020] [Indexed: 12/16/2022]
Abstract
PURPOSE Acute high-intensity unaccustomed eccentric exercise performed by naive subjects is accompanied by disturbances in muscle damage biomarkers. The aim of the study was to investigate whether a causal relationship indeed exists between eccentric exercise and muscle damage. METHODS Twenty-four men randomly assigned into a concentric only or an eccentric-only training group and performed 10 weeks of isokinetic resistance exercise (one session/week of 75 maximal knee extensors actions). Physiological markers of muscle function and damage (i.e., range of motion, delayed onset muscle soreness, isometric, concentric and eccentric peak torque) were assessed prior to and 1-3 and 5 days post each session. Biochemical markers of muscle damage (creatine kinase) and inflammation (C-reactive protein) were measured prior and 2 days post each session. RESULTS After the first bout, eccentric exercise induced greater muscle damage compared to concentric exercise; however, during the nine following sessions, this effect progressively diminished, while after the 10th week of training, no alterations in muscle damage biomarkers were observed after either exercise protocol. Additionally, strength gains at the end of the training period were comparable between the two groups and were mode-specific. CONCLUSION (1) eccentric exercise per se does not affect muscle damage biomarkers; (2) muscle damage occurs as a result of muscle unaccustomedness to this action type; (3) exercise-induced muscle damage is not a prerequisite for increased muscle strength. Collectively, we believe that muscle unaccustomedness to high-intensity eccentric exercise, and not eccentric exercise per se, is the trigger for muscle damage as indicated by muscle damage biomarkers.
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Affiliation(s)
- Nikos V Margaritelis
- Dialysis Unit, 424 General Military Hospital of Thessaloniki, Thessaloniki, Greece.,Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Anastasios A Theodorou
- Department of Health Sciences, School of Sciences, European University Cyprus, Nicosia, Cyprus
| | - Panagiotis N Chatzinikolaou
- Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Antonios Kyparos
- Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Michalis G Nikolaidis
- Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Serres, Greece
| | - Vassilis Paschalis
- Department of Physical Education and Sport Sciences, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Ethnikis Αntistasis 41, 17237, Athens, Greece.
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Influence of the Menstrual Cycle on Blood Markers of Muscle Damage and Inflammation Following Eccentric Exercise. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17051618. [PMID: 32131554 PMCID: PMC7084328 DOI: 10.3390/ijerph17051618] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 02/26/2020] [Accepted: 02/28/2020] [Indexed: 12/21/2022]
Abstract
The aim of this study was to evaluate whether the menstrual cycle and its underlying hormonal fluctuations affect muscle damage and inflammation in well-trained females following an eccentric exercise. Nineteen eumenorrheic women performed an eccentric squat-based exercise in the early follicular phase, late follicular phase and mid-luteal phase of their menstrual cycle. Sex hormones and blood markers of muscle damage and inflammation –creatine kinase, myoglobin, lactate dehydrogenase, interleukin-6, tumoral necrosis factor-α, and C reactive protein– were analyzed in each phase. No effect of menstrual cycle phase was observed (p > 0.05), while an interaction for interleukin-6 was shown (p = 0.047). Accordingly, a moderate effect size [0.68 (0.53)–0.84 (0.74)], indicated that interleukin-6 values 2 h post-trial (2.07 ± 1.26 pg/mL) were likely to be higher than baseline (1.59 ± 0.33 pg/mL), 24 h (1.50 ± 0.01 pg/mL) and 48 h (1.54 ± 0.13 pg/mL) in the mid-luteal phase. Blood markers of muscle damage and inflammation were not affected by the menstrual cycle in well-trained women. The eccentric exercise barely triggered muscle damage and hence, no inflammation was observed, possibly due to participants training status. The mid-luteal phase was the only phase reflecting a possible inflammatory response in terms of interleukin-6, although further factors than sex hormones seem to be responsible for this finding.
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Xiang H, Chen S, Zhang H, Zhu X, Wang D, Liu H, Wang J, Yin T, Liu L, Kong M, Zhang J, Li H, Zhao X. Transcriptome changes provide genetic insights into the effects of rearing systems on chicken welfare and product quality. J Anim Sci 2019; 96:4552-4561. [PMID: 30169713 DOI: 10.1093/jas/sky314] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/29/2018] [Indexed: 12/24/2022] Open
Abstract
Farm animals raised under free-range (FR) systems are assumed to have improved welfare and higher-quality products that are better to eat than intensively reared animals. However, the modulations are limited in scientific investigations. In this study, we compared 2 rearing systems (FR and cage) and their effects on chickens, including production performance, product quality, body condition, physiological indicators, and gene expression. By using a match-mismatch design in which each treatment was transferred to the other treatment during the last period of the experiment, we aimed to understand the influence of current and former rearing conditions and the ability of individuals to adapt to the current environment. The results indicated that the FR system led to better chicken welfare (e.g., gait score, feather condition, and physiological indicators, P < 0.05) and contributed to higher product quality (P < 0.05), although it resulted in poorer production performance (P < 0.05) and foot pad condition (P < 0.05) than that of the cage rearing system. Additionally, the FR system triggered a series of inner changes and genetic responses in chickens, such as the upregulation of calcium and GnRH signaling, actin and cytoskeleton regulations, immune functions, and developmental processes, and the downregulation of pathological regulations (q-value < 0.05 for all gene ontology terms and P < 0.05 for all Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways). In conclusion, rearing systems alter chicken gene expression patterns, which provide a genetic basis for the adaptability to rearing environments and ultimately affects chicken welfare and products.
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Affiliation(s)
- Hai Xiang
- School of Life Science and Engineering, Foshan University, Foshan, China.,National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Siyu Chen
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China.,Laboratory of Land Ecology, Field Science Center, Graduate School of Agricultural Science, Tohoku University, Miyagi, Japan
| | - Hui Zhang
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Xu Zhu
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Dan Wang
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Huagui Liu
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Jikun Wang
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Institute of Qinghai-Tibetan Plateau, Southwest University for Nationalities, Chengdu, China
| | - Tao Yin
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Langqing Liu
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Minghua Kong
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Jian Zhang
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Hua Li
- School of Life Science and Engineering, Foshan University, Foshan, China
| | - Xingbo Zhao
- School of Life Science and Engineering, Foshan University, Foshan, China.,National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China
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Sims DT, Onambélé-Pearson GL, Burden A, Payton C, Morse CI. Morphological and Mechanical Properties of the Human Patella Tendon in Adult Males With Achondroplasia. Front Physiol 2018; 9:867. [PMID: 30079026 PMCID: PMC6063341 DOI: 10.3389/fphys.2018.00867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 06/18/2018] [Indexed: 11/13/2022] Open
Abstract
Achondroplasia is a genetic mutation of fibroblast growth factor receptor resulting in impaired growth plate development in long bones due to lower collagen turnover. Despite the characteristic shorter stature and lower strength in Achondroplasic groups, little is known of the tendon mechanical properties under loading. The aim of this study was therefore to conduct a between measure design of patella tendon (PT) mechanical properties (stress, strain, stiffness and Young's Modulus) in 10 men with Achondroplasia (22 ± 3 years) and 17 male controls (22 ± 2 years). PT mechanical properties were measured during isometric maximal voluntary contraction (iMVC) of the knee extensors using ultrasonography. The Achondroplasic group produced 54% less stress at iMVC than controls (29.4 ± 8.0 v 64.5 ± 14.0 MPa, P < 0.001, d = 3.12). Maximal excursion of the Achondroplasic PT was 22% less than controls at iMVC (7.4 ± 2.1 v 5.5 ± 1.7 mm, P < 0.001, d = 0.99), but there was no difference in strain between groups (13 ± 4 v 13 ± 3%, P > 0.05). Achondroplasic PT were 47% less stiff (748 ± 93 v 1418 ± 101 N·mm−1, P < 0.001, d = 6.89) and had a 51% lower Young's modulus (0.39 ± 0.09 v 0.77 ± 0.14 GPa, P < 0.001, d = 3.46) than controls at iMVC. Achondroplasic PT are indeed more compliant than controls which may contribute to lower relative force production. The causes of higher Achondroplasic PT compliance are unclear but are likely due to the collagen related genetic mutation which causes Achondroplasia.
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Affiliation(s)
- David T Sims
- Health, Exercise and Active Living Research, Manchester Metropolitan University, Manchester, United Kingdom
| | - Gladys L Onambélé-Pearson
- Health, Exercise and Active Living Research, Manchester Metropolitan University, Manchester, United Kingdom
| | - Adrian Burden
- Health, Exercise and Active Living Research, Manchester Metropolitan University, Manchester, United Kingdom
| | - Carl Payton
- Health, Exercise and Active Living Research, Manchester Metropolitan University, Manchester, United Kingdom
| | - Christopher I Morse
- Health, Exercise and Active Living Research, Manchester Metropolitan University, Manchester, United Kingdom
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