Hamstring strains in professional rugby players result in increased fascial stiffness without muscle quality changes as assessed using shear wave elastography |
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| Institution: | 1. Department of Sports and Health Sciences, Faculty of Human Sciences, University of East Asia, Ichinomiya Gakuen Cyo, Shimonoseki, Yamaguchi, Japan;2. Konan Medical Center, Department of Orthopaedic Surgery, Hyogo, Japan 1-5-16 Kamokogahara Higashinada, Kobe, Hyogo, Japan;1. Rehabilitation Sciences Post-Graduation Program, Augusto Motta University Centre (UNISUAM), Rio de Janeiro, Brazil;2. Department of Medical Imaging, Allergology and Physiotherapy, Faculty of Dental Medicine, Medical University of Plovdiv, Bulgaria;3. Department of Kinesiotherapy, Faculty of Public Health, Medical University of Sofia, Bulgaria;4. Department of Physical Therapy, School of Medicine, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil;5. Postgraduate Program in Medical Sciences, School of Medical Sciences, State University of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil;1. Federal University of Triangulo Mineiro, Uberaba, MG, Brazil;2. Department of Applied Physiotherapy, Federal University of Triangulo Mineiro, Uberaba, MG, Brazil;1. Bern University of Applied Sciences, Department of Health Professions, Bern, Switzerland;2. Swiss Specialist Group for Analytical Biomachenaics According to Sohier, Switzerland;3. Regional Hospital Baselland-Bruderholz, Institute for Radiology and Nuclear Medicine, Switzerland;1. Federal University do Triângulo Mineiro, UFTM, Uberaba, Minas Gerais, Brazil;2. Health Sciences, Concentration Area Human Pathology – Federal University do Triângulo Mineiro, UFTM, Physical Therapistat Associação de Pais e Amigos dos Excepcionais de Uberaba, APAE, Uberaba, Minas Gerais, Brazil;3. Functional and Molecular Biology, Adjunct Teacher of Physiotherapy - Federal University do Triângulo Mineiro, UFTM, Uberaba, Minas Gerais, Brazil;4. Biomecanic Sciences, Senior Lecturer of the Discipline of Human Anatomy - Federal University do Triângulo Mineiro, UFTM, Uberaba, Minas Gerais, Brazil;5. Morphology Senior Lecturer of the Discipline of Human Anatomy - Federal University do Triângulo Mineiro, UFTM, Uberaba, Minas Gerais, Brazil;6. Health Sciences, Concentration Area Human Pathology e Researcher and Lecturer at Federal University do Triângulo Mineiro - UFTM, Uberaba, Minas Gerais, Brazil;1. Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST), 505 Boulevard De Maisonneuve Ouest, Montréal, Québec, H3A 3C2, Canada;2. School of Rehabilitation, Faculty of Medicine, Université de Montréal, 7077 Avenue du Parc, Montreal, Montreal, Quebec, H3T 1J4, Canada;3. School of Physical & Occupational Therapy, McGill University, 845 Rue Sherbrooke Ouest, Montréal, Québec, H3G 1Y5, Canada;4. Center for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Institut universitaire sur la réadaptation en déficience physique de Montréal (IURDPM), Centre intégré universitaire de santé et de services sociaux du Centre-Sud-de-l’Ile-de-Montréal (CCSMTL), 6300 Avenue de Darlington, Montréal, Québec, H3S 2J4, Canada |
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| Abstract: | IntroductionHamstring strain injury is common among sports injuries. A previous history of this injury is considered a strong predictor of recurrent hamstring strain injury. Fascial tissue reportedly becomes stiffer after hamstring strain injury. However, the association between fascial stiffness and previous hamstring strain injury has not been investigated in clinical studies. We aimed to determine whether a previous history of hamstring strain injury affects fascial tissue and muscle tissues using shear wave elastography.MethodIn eleven male professional rugby players, the stiffness as a shear modulus (kPa) of fascial tissue and muscle was measured on the specific injured area measured by magnetic resonance imaging (MRI) at resting position by using shear wave elastography. The side-to-side differences between the injured and the uninjured side were analyzed. The length and area of the muscle scar tissue were evaluated by MRI in relation to fascial stiffness.ResultsThe shear elastic modulus of fascia was stiffer in the injured vs. the uninjured side; however, no difference was observed in the muscle. No significant relationship was detected between the length and area of the muscle scar tissue (all P > 0.05).DiscussionRugby players with a previous history of hamstring strain injury exhibited passive stiffness of fascial tissues in the injured leg, regardless of the length or area of the muscle scar tissue. However, the passive stiffness of muscles was same between the injured and the uninjured leg.ConclusionThe results can be beneficial to consider future risk for hamstring strain injuries. |
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