Babault Nicolas, Cometti Carole
INSERM UMR1093-CAPS, Université de Bourgogne, UFR des Sciences du Sport, Dijon, France.
Centre d'Expertise de la Performance, Université de Bourgogne, UFR des Sciences du Sport, Dijon, France.
J Hum Kinet. 2024 Dec 19;97:5-11. doi: 10.5114/jhk/193941. eCollection 2025 Apr.
This case study aimed to explore neuromuscular strategies used by a cyclist to control the speed while riding downhill a mountain with a brakeless, fixed-gear bicycle. Accelerations of the pedals and electromyographic activity of four lower limb muscles were registered to determine muscle activation during two decelerating strategies. Eccentric cycling was mostly used to control the bicycle speed with short (536 ± 51 ms) and low-intensity contractions. Isometric pedaling cycles were more efficient for decelerations with long (1,092 ± 281 ms) and intensive contractions. Isometric muscle activation was 122, 31, 25 and 44% greater than eccentric for vastus lateralis, biceps femoris, gastrocnemius lateralis and tibialis anterior muscle, respectively. This study suggests specific activation patterns to help the practitioner for safety rides, but that could have implications for rehabilitation purposes.
本案例研究旨在探究一名骑自行车者在下坡骑行时，使用一辆无刹车、固定齿轮自行车控制速度所采用的神经肌肉策略。记录踏板的加速度和四块下肢肌肉的肌电图活动，以确定两种减速策略期间的肌肉激活情况。在控制自行车速度时，大多采用短（536±51毫秒）且低强度收缩的离心骑行方式。等长蹬踏周期在长（1092±281毫秒）且高强度收缩的减速过程中效率更高。股外侧肌、股二头肌、腓骨外侧肌和胫骨前肌的等长肌肉激活分别比离心激活大122%、31%、25%和44%。本研究提出了特定的激活模式，以帮助骑行者安全骑行，但这可能对康复目的也有影响。
