Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players
The aim of the study was to describe the strength symmetry of internal and external rotator muscles and the conventional and functional strength balance ratios between these muscles in adolescent male volleyball players. Twenty-eight male adolescent volleyball players (15.5 ± 1.1 years (15&...
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doaj-f3c31f3246424c7aa8b5bc7a7f780e6d2020-11-25T01:33:15ZengMDPI AGSports2075-46632019-02-01724910.3390/sports7020049sports7020049Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball PlayersClaudio Andre Barbosa de Lira0Valentine Zimermann Vargas1Rodrigo Luiz Vancini2Marilia Santos Andrade3Laboratório de Avaliação do Movimento Humano, Faculdade de Educação Física e Dança, Universidade Federal de Goiás, Goiânia 74690-900, BrazilDepartamento de Fisiologia, Universidade Federal de São Paulo, São Paulo 04023-901, BrazilCentro de Educação Física e Desportos, Universidade Federal do Espírito Santo, Vitória 29075-910, BrazilDepartamento de Fisiologia, Universidade Federal de São Paulo, São Paulo 04023-901, BrazilThe aim of the study was to describe the strength symmetry of internal and external rotator muscles and the conventional and functional strength balance ratios between these muscles in adolescent male volleyball players. Twenty-eight male adolescent volleyball players (15.5 ± 1.1 years (15⁻17 years); 73.2 ± 10.9 kg (55.3⁻100.1 kg) and 184.9 ± 8.4 cm (170⁻209 cm)) participated in this cross-sectional study. Concentric and eccentric peak torque of external and internal rotator muscles were measured, and conventional and functional strength balance ratios were calculated. The dominant limb presented significantly higher values for peak torque than the non-dominant limb of internal rotator muscles at concentric action assessed at 60°/s (48.7 ± 13.7 Nm and 43.9 ± 11.6 Nm, <i>p</i> = 0.01 and <i>d</i> value = 0.37) and at 240°/s (44.7 ± 11.2 Nm and 41.1 ± 11.0 Nm, <i>p</i> = 0.03 and <i>d</i> = 0.32). However, there was no difference in the peak torque of external rotator muscle between limbs for either angular speed. Regarding strength balance ratios, neither conventional (74.8 ± 14.3 for dominant limb and 80.1 ± 14.0 for non-dominant limb, <i>p</i> = 0.06 and <i>d</i> = 0.37) nor functional ratio (1.2 ± 0.4 for dominant limb and 1.3 ± 0.5 for non-dominant limb, <i>p</i> = 0.06 and <i>d</i> = 0.22) presented significant contralateral differences. Despite the short practice time, adolescent male volleyball athletes already have significant contralateral differences for internal rotator muscles and conventional ratio tends to be asymmetrical. Thus, preventive shoulder-strengthening programs, focused on the internal rotator muscles of the non-dominant limb, aiming to correct contralateral deficiency and conventional ratio, may be warranted for this population in the process of biological growth, maturation and development.https://www.mdpi.com/2075-4663/7/2/49isokinetic dynamometervolleyballsportrehabilitationshoulder |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Claudio Andre Barbosa de Lira Valentine Zimermann Vargas Rodrigo Luiz Vancini Marilia Santos Andrade |
spellingShingle |
Claudio Andre Barbosa de Lira Valentine Zimermann Vargas Rodrigo Luiz Vancini Marilia Santos Andrade Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players Sports isokinetic dynamometer volleyball sport rehabilitation shoulder |
author_facet |
Claudio Andre Barbosa de Lira Valentine Zimermann Vargas Rodrigo Luiz Vancini Marilia Santos Andrade |
author_sort |
Claudio Andre Barbosa de Lira |
title |
Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players |
title_short |
Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players |
title_full |
Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players |
title_fullStr |
Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players |
title_full_unstemmed |
Profiling Isokinetic Strength of Shoulder Rotator Muscles in Adolescent Asymptomatic Male Volleyball Players |
title_sort |
profiling isokinetic strength of shoulder rotator muscles in adolescent asymptomatic male volleyball players |
publisher |
MDPI AG |
series |
Sports |
issn |
2075-4663 |
publishDate |
2019-02-01 |
description |
The aim of the study was to describe the strength symmetry of internal and external rotator muscles and the conventional and functional strength balance ratios between these muscles in adolescent male volleyball players. Twenty-eight male adolescent volleyball players (15.5 ± 1.1 years (15⁻17 years); 73.2 ± 10.9 kg (55.3⁻100.1 kg) and 184.9 ± 8.4 cm (170⁻209 cm)) participated in this cross-sectional study. Concentric and eccentric peak torque of external and internal rotator muscles were measured, and conventional and functional strength balance ratios were calculated. The dominant limb presented significantly higher values for peak torque than the non-dominant limb of internal rotator muscles at concentric action assessed at 60°/s (48.7 ± 13.7 Nm and 43.9 ± 11.6 Nm, <i>p</i> = 0.01 and <i>d</i> value = 0.37) and at 240°/s (44.7 ± 11.2 Nm and 41.1 ± 11.0 Nm, <i>p</i> = 0.03 and <i>d</i> = 0.32). However, there was no difference in the peak torque of external rotator muscle between limbs for either angular speed. Regarding strength balance ratios, neither conventional (74.8 ± 14.3 for dominant limb and 80.1 ± 14.0 for non-dominant limb, <i>p</i> = 0.06 and <i>d</i> = 0.37) nor functional ratio (1.2 ± 0.4 for dominant limb and 1.3 ± 0.5 for non-dominant limb, <i>p</i> = 0.06 and <i>d</i> = 0.22) presented significant contralateral differences. Despite the short practice time, adolescent male volleyball athletes already have significant contralateral differences for internal rotator muscles and conventional ratio tends to be asymmetrical. Thus, preventive shoulder-strengthening programs, focused on the internal rotator muscles of the non-dominant limb, aiming to correct contralateral deficiency and conventional ratio, may be warranted for this population in the process of biological growth, maturation and development. |
topic |
isokinetic dynamometer volleyball sport rehabilitation shoulder |
url |
https://www.mdpi.com/2075-4663/7/2/49 |
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