Effect Of Ballet Dance On Knee Joints Muscle Strength Based On The Isokinetic Research

Abstract

PURPOSE: Several researches have revealed that dance training increases muscle strength. By comparing the muscle strength of knee joints of ordinary college students with ballet dance students', the differences between the two groups were analyzed and the influence of dance on muscle strength was explained. METHODS: 48 healthy college students volunteered to participate in the study. Experimental group consisted of 24 Ballet students (12 male, 21.5±0.9years; 12 female, 20.9±1.8years); control group consisted of 24 non-dance students (12male, 20.7±0.9years, 12 female, 20.6±0.8years). German ISOMED2000 Isokinetic test device was used to test the knee joints strength of all participants, with the concentric contraction test going first and then following the eccentric contraction test , with the testing angular of 60°/s,180°/s .The test variables include peak torque,relative peak torque and the peak torque ratio of flexion and extension. RESULTS: The result showed that the female and male Ballet students have significantly higher peak torque (N·m )and relative peak torque (Nm/Kg) at all angular of knee flexion and extension than non-dance students (All peak torque flexion at 60°/s and 180°/s: 81.805±10.84 vs. 58.725±7.34 and 68.055±9.22 vs.46.875±8.78; both p<0.01. All peak torque extension at 60°/s and 180°/s: 178.335±25.88 vs. 124.2±19.54 and 128.465±14.96 vs. 92.505±16.41; both p<0.01. All relative peak torque flexion at 60°/s and 180°/s:1.29±0.14 vs. 1.02±0.14 and 1.08±0.14 vs.0.81±0.13;both p<0.01. All relative peak torque extension at 60°/s and 180°/s :2.84±0.43 vs.2.17±0.38 and 2.04 ±0.25 vs.1.61±0.28; both p<0.01.).However, there is no significant difference in peak torque ratio of flexion and extension between two groups (P>0.05). CONCLUSIONS: The results indicated that long-term ballet training can obviously improve the control strength and outbreak power of knee flexion and extension. Ballet training leads to a balanced effect impact on hamstring and quadriceps, which helps to avoid knee injuries and improve the dance movements. Acknowledgements: This work was supported by Beijing philosophy and social science foundation research (Grants No.14JDWYB011).