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Original Research
Velocity-specific knee strength between professional and under-17 female volleyball player
Submitted: 22 August 2018 | Published: 11 June 2019
About the author(s)
Alexandre R.M. Pelegrinelli, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil; and, Laboratory of Applied Biomechanics, Universidade Estadual de Londrina, Londrina, BrazilLaís F. Dela Bela, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil
Mariana F. Silva, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil
Lucas C.R. Rodrigues, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil
João P. Batista Jr., Department of Geriatric Medicine, Uniklinik – Rheinisch–Westfälische Technische Hochschule (RWTH) Aachen University Hospital, Aachen, Germany
Leandro C. Guenka, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil
Josilainne M. Dias, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil
Lee E. Brown, Department of Kinesiology, California State University, Fullerton, United States
Rodrigo L. Carregaro, School of Physical Therapy, Universidade de Brasília, Brasília, Brazil
Felipe A. Moura, Laboratory of Applied Biomechanics, Universidade Estadual de Londrina, Londrina, Brazil
Jefferson R. Cardoso, Laboratory of Biomechanics and Clinical Epidemiology, Research Group in Physical Therapy Assessment and Intervention (PAIFIT), Universidade Estadual de Londrina, Londrina, Brazil
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Abstract
Background: Many studies have investigated isokinetic performance in volleyball players but not through surface maps.
Objectives: The goals of this study were to assess velocity-specific isokinetic knee extensor–flexor muscle strength and to compare the isokinetic knee extensor–flexor muscles between professional (PRO) and under-17 (U17) female volleyball players.
Method: This cross-sectional laboratory study was developed with two groups: PRO (n = 12), medianage = 21.3 years, and U17 (n = 9), medianage = 15 years. Peak torque, total work, mean power, angle of peak torque, hamstring–quadriceps torque ratio (H–Q ratio) and torque–angle–velocity surface maps were analysed from knee extension–flexion at 60, 120 and 300 degrees per second (°/s).
Results: Significant differences were identified for extensor peak torque between PRO x = 202.3 Newton metre (N·m) (standard deviation [SD] = 24.4) and U17 x = 141.6 N·m (30.1) at 60 °/s (p < 0.001; d = 2.21) as well as flexor peak torque (PRO x = 75.7 N·m [10.3] and U17 x = 57.7 N·m [11.4]) at 120 °/s (p < 0.001; d = 1.65) for the dominant limb. There were also significant group differences for total work and mean power at all velocities for extension and flexion. Surface maps demonstrated higher torque at lower speeds for both groups with smaller torque changes across velocities for flexion.
Conclusion: Different groups of female volleyball players showed contrasting concentric knee muscle strength across isokinetic velocities.
Clinical implications: These results demonstrate the importance of specific strength training for different age groups, even within the same sport, and provide insight into muscle strength.
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