Tottori Nobuaki, Kurihara Toshiyuki, Otsuka Mitsuo, Isaka Tadao
Department of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan.
J Physiol Anthropol. 2016 Jan 26;35:3. doi: 10.1186/s40101-016-0086-6.
The aim of this study was to investigate whether lateral differences in the cross-sectional areas of the hip and thigh muscles were related to curve sprinting time.
Thirteen college students (10 men and 3 women; mean ± SD: age, 20.4 ± 1.7 years; height, 167.6 ± 8.9 cm; mass, 57.4 ± 5.4 kg) participated in this study. The participants were instructed to sprint along a circular track (23 m radius) in the counterclockwise and clockwise directions. Magnetic resonance imaging was used to measure the cross-sectional area of the psoas major, quadriceps femoris, and hamstring muscles. The symmetry index was used to evaluate the lateral differences in the cross-sectional area.
The lateral difference was observed in the cross-sectional area (CSA) of the thigh muscles, not in the psoas major muscle. The sprint time was not significantly different between the counterclockwise (22.15 ± 2.27 s) and clockwise (22.13 ± 2.32 s) directions. No significant correlations were found between the symmetry index of the thigh muscles and the cross-directional differences in sprint time. However, the symmetry index of the psoas major muscle correlated significantly with the cross-directional difference in sprint time (r = -0.614, P = 0.026).
These findings suggest that the participants in whom the cross-sectional area of the psoas major muscle of the outer leg was larger than that of the inner leg were faster in curve sprinting.
本研究旨在调查髋部和大腿肌肉横截面积的左右差异是否与弯道冲刺时间有关。
13名大学生（10名男性和3名女性；平均±标准差：年龄，20.4±1.7岁；身高，167.6±8.9厘米；体重，57.4±5.4千克）参与了本研究。参与者被要求沿半径为23米的圆形跑道逆时针和顺时针方向冲刺。使用磁共振成像测量腰大肌、股四头肌和腘绳肌的横截面积。对称指数用于评估横截面积的左右差异。
在大腿肌肉的横截面积中观察到左右差异，而腰大肌未观察到。逆时针（22.15±2.27秒）和顺时针（22.13±2.32秒）方向的冲刺时间没有显著差异。大腿肌肉的对称指数与冲刺时间的横向差异之间未发现显著相关性。然而，腰大肌的对称指数与冲刺时间的横向差异显著相关（r = -0.614，P = 0.026）。
这些发现表明，外侧腿腰大肌横截面积大于内侧腿的参与者在弯道冲刺中速度更快。
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