Sport and Health Research Center, Physical Education Department, Tongji University, Shanghai, China.
Physical Education and Sports Science Institute of Shanghai, Shanghai 200030, China.
Biomed Res Int. 2020 Jan 3;2020:7294820. doi: 10.1155/2020/7294820. eCollection 2020.
Repeated sprint cycling is an effective training method in promoting athletic performance of cyclists, which may induce severe fatigue of lower limb muscles. However, the relationship between the fatigue of each lower limb muscles and the changing of exercise performance remains unclear. In this study, ten cyclist volunteers performed a series of 6-second sprints with 24-s recovery for five times. Power, cadence, and EMG mean frequency (MNF) of each lower limb muscle group for every 2-second epoch, as well as the grey relational grade between exercise performance and MNF of each lower limb muscle group during the whole process were calculated. It has been found that MNF of Rectus femoris (RF), Vastus (VAS), Gastrocnemius (GAS), and the hamstring muscle group (HAM) showed significant negative correlation with the increase in both sprint number and intrasprint duration time, while the grey relational grade of HAM and VAS was higher than that of other muscles. The results demonstrated that the exercise performance of both power and cadence were most closing related to the fatigue degree of HAM and VAS during repeated sprint cycling exercise.
重复冲刺骑行是一种有效的训练方法，可以提高自行车运动员的竞技表现，但其可能导致下肢肌肉严重疲劳。然而，下肢各肌肉群的疲劳与运动表现的变化之间的关系尚不清楚。在这项研究中，十名自行车运动员进行了五次 6 秒冲刺和 24 秒恢复的系列运动。计算了每个下肢肌肉群在每 2 秒时的功率、踏频和肌电图平均频率（MNF），以及整个过程中运动表现与每个下肢肌肉群 MNF 的灰色关联等级。研究发现，股直肌（RF）、股外侧肌（VAS）、腓肠肌（GAS）和腘绳肌（HAM）的 MNF 与冲刺次数和冲刺内持续时间的增加呈显著负相关，而 HAM 和 VAS 的灰色关联等级高于其他肌肉。结果表明，在重复冲刺骑行运动中，功率和踏频的运动表现与 HAM 和 VAS 的疲劳程度最密切相关。
