Shoulder functional ratio in elite junior tennis players |
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| Authors: | Michele Forgiarini Saccol Guilherme Conforto Gracitelli Rogério Teixeira da Silva Cristiano Frota de Souza Laurino Anna Maria Fleury Marília dos Santos Andrade Antonio Carlos da Silva |
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| Affiliation: | 1. NEO – Orthopedic Sports Medicine Research Center, Rua Botucatu, 591, cj 114, 11° andar, Vila Clementino, São Paulo, SP, Brazil, Cep: 04023-062;2. CEFE/UNIFESP-EPM – Center for Physiology Exercises, Federal University of São Paulo, Rua Botucatu, 572, Vila Clementino, São Paulo, SP, Brazil, Cep: 04023-061;1. Sports Medicine Research Laboratories, Department of Exercise and Sport Science, University of North Carolina, Chapel Hill, NC, USA;2. Department of Health and Kinesiology, University of Texas, San Antonio, TX, USA;1. Departamento de Fisiologia, Universidade Federal de São Paulo (UNIFESP), Rua Botucatu, 862, 5° andar, Vila Clementino, 04023-062, São Paulo, SP, Brazil;2. Setor de Fisiologia Humana e do Exercício, Universidade Federal de Goiás (UFG), Campus Jataí, Rodovia BR-364, km 192, n° 3800, Setor Industrial, 75801-615, Jataí, GO, Brazil;3. Escola de Artes, Ciências e Humanidades, Universidade de São Paulo (USP), Rua Arlindo Bettio, 1000, Ermelino Matarazzo, 03828-000, São Paulo, SP, Brazil;1. Faculty of Physiotherapy, Academy of Physical Education in Wroc?aw, al. I.J. Paderewskiego 35, 51-612 Wroc?aw, Poland;2. Department of Biomechanics, Opole University of Technology, ul. Prószkowska 76, 45-758 Opole, Poland;1. Department of Physical Therapy, Federal University of Santa Maria, Santa Maria, Brazil;2. College of Medicine, Federal University of Ceará, Fortaleza, Brazil;3. Sports Traumatology Center, Orthopaedic and Traumatology Department, Federal University of São Paulo, São Paulo, Brazil |
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| Abstract: | ObjectiveTo evaluate shoulder rotation strength and compare the functional ratio between shoulders of elite junior tennis players.DesignThis cross-sectional study evaluated muscular rotation performance of 40 junior tennis players (26 male and 14 female) with an isokinetic dynamometer.Main outcome measuresStrength variables of external (ER) and internal rotators (IR) in concentric and eccentric modes were considered. For the peak torque functional ratio, the eccentric strength of the ER and the concentric strength of the IR were calculated.ResultsAll variables related to IR were significantly higher on the dominant compared to the non-dominant side in males and females (p < 0.05), but only boys exhibited this dominance effect in ER (p < 0.05 and p < 0.001). Regarding functional ratios, they were significantly lower for the dominant shoulder (p < 0.001) and below 1.00 for both groups, indicating that the eccentric strength of the ER was not greater than the concentric strength of the IR.ConclusionElite junior tennis players without shoulder injury have shoulder rotation muscle strength imbalances that alter the normal functional ratio between rotator cuff muscles. Although these differences do not seem to affect the athletic performance, detection and prevention with exercise programs at an early age are recommended. |
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