The Korean Journal of Physical Education (한국체육학회지)

Korean Alliance for Health: Physical Education: Recreation:and Dance (한국체육학회)
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The effects of different stretching duration on strength and flexibility in ballerina

발레 무용수의 공연직전 스트레칭이 근력과 유연성에 미치는 영향

Kim, Mi-Youn;Jun, Tae-Won;Kim, Yun-Su;Seo, Han-Kyo;Kim, Kyung-Rae;Kim, Eun-Kyung;Kim, Kyung-Bae;Kim, Kwang-June;Kim, Hyo-Joong;Kim, Ki-Jeong;Kim, Seoung-Tack
김미연;전태원;김연수;서한교;김경래;김은경;김경배;김광준;김효중;김기정;김승택

  • Published : 2005.11.30
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Abstract

The purpose of this study is to examine the effects of stretching right before performances on strength and flexibility of ballet dancers. For this purpose twelve female ballet majors were chosen to perform acute stretching of hamstring muscle for 0 second, 10 seconds, 30 seconds, and 60 seconds with 15 seconds of intervals between each stretching. And change in flexibility, peak torque, peak torque per body weight, and total work were measured by a Con-trex isokinetic dynanometer, following the performance of the subjects' stretching. The data were analyzed by one-way repeated measures ANOVA with p<.05 as the level of significance. The results are as follows : The performance of stretching caused significant decrease in the peak torque of knee flexion(p<.05). But difference in stretching duration(10 seconds, 30 seconds, 60 seconds) was found not to have significant influence in the peak torque of knee flexion The performance of stretching caused significant decrease in the peak torque of knee flexion per body weight(p<.05), while difference in stretching duration(10 seconds, 30 seconds, 60 seconds) did not show Significant difference in the peak torque of knee flexion per body weight. The performance of stretching caused significant decrease in total work of knee flexion(p<.05), yet difference in stretching duration(10 seconds, 30 seconds, 60 seconds) did not indicate significant difference in total work of knee flexion Flexibility of knee flexion in each different stretching duration was not significantly different(p<.05) but showed a tendency to increase as duration increased. Based on these results, it is concluded that peak torque, peak torque per body weight, and total work were significantly decreased after acute stretching because the strength loss after acute stretching is assumed to result from the change of muscle length, muscle elasticity, and stretch reflex. On the other hand, different stretching duration(10 seconds, 30 seconds, 60 seconds) revealed no significant difference in strength. This is assumed to result from the fact that stretching durations were short and that there was only one muscle to be stretched. Flexibility was not significantly different in strength after acute stretching, either, and only showed a tendency to increase.

Keywords

References

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