Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, 40-065 Katowice, Poland.
Int J Environ Res Public Health. 2021 Dec 14;18(24):13177. doi: 10.3390/ijerph182413177.
The purpose of this cross-sectional study was to analyze changes in normalized surface electromyography (sEMG) signals for the , , , , and muscles occurring during a 400 m indoor sprint between subsequent curved sections of the track. Ten well-trained female sprinters (age: 21 ± 4 years; body mass: 47 ± 5 kg; body height: 161 ± 7 cm; 400 m personal best: 52.4 ± 1.1 s) performed an all-out 400 m indoor sprint. Normalized sEMG signals were recorded bilaterally from the selected lower limb muscles. The two-way ANOVA (curve × side) revealed no statistically significant interaction. However, the main effect analysis showed that normalized sEMG signals significantly increased in subsequent curves run for all the studied muscles: ( = 0.003), ( < 0.0001), ( = 0.044), ( = 0.001), and ( = 0.023), but differences between limbs were significant only for the ( = 0.012). The results suggest that the normalized sEMG signals for the lower limb muscles increased in successive curves during the 400 m indoor sprint. Moreover, the of the inner leg is highly activated while running curves; therefore, it should be properly prepared for high demands, and attention should be paid to the possibility of the occurrence of a negative adaptation, such as asymmetries.
本横断面研究的目的是分析在连续弯道的 400 米室内短跑中，下肢肌肉的表面肌电信号（sEMG）归一化变化。10 名训练有素的女性短跑运动员（年龄：21 ± 4 岁；体重：47 ± 5 公斤；身高：161 ± 7 厘米；400 米个人最好成绩：52.4 ± 1.1 秒）进行了全力 400 米室内短跑。从选定的下肢肌肉双侧记录归一化 sEMG 信号。双向方差分析（弯道×侧）未显示出统计学上显著的交互作用。然而，主效应分析显示，所有研究肌肉在后续弯道运行时归一化 sEMG 信号显著增加：（= 0.003），（< 0.0001），（= 0.044），（= 0.001）和（= 0.023），但仅在 （= 0.012）上四肢之间存在差异。结果表明，在 400 米室内短跑中，连续弯道时下肢肌肉的归一化 sEMG 信号增加。此外，内侧腿部的 高度活跃，因此在跑步时应充分准备应对高需求，并注意可能发生的负面适应，如不对称。
