Lin Cheng-Feng, Lee Wan-Chin, Chen Yi-An, Hsue Bih-Jen
Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
J Appl Biomech. 2016 Aug;350(358):350-8. doi: 10.1123/jab.2014-0263. Epub 2016 Mar 8.
Fatigue in ballet dancers may lead to injury, particularly in the lower extremities. However, few studies have investigated the effects of fatigue on ballet dancers' performance and movement patterns. Thus, the current study examines the effect of fatigue on the balance, movement pattern, and muscle activities of the lower extremities in ballet dancers. Twenty healthy, female ballet dancers performed releve on demi-pointe before and after fatigue. The trajectory of the whole body movement and the muscle activities of the major lower extremity muscles were recorded continuously during task performance. The results show that fatigue increases the medial-lateral center of mass (COM) displacement and hip and trunk motion, but decreases the COM velocity and ankle motion. Moreover, fatigue reduces the activities of the hamstrings and tibialis anterior, but increases that of the soleus. Finally, greater proximal hip and trunk motions are applied to compensate for the effects of fatigue, leading to a greater COM movement. Overall, the present findings show that fatigue results in impaired movement control and may therefore increase the risk of dance injury.
芭蕾舞演员的疲劳可能会导致受伤，尤其是在下肢。然而，很少有研究调查疲劳对芭蕾舞演员表现和运动模式的影响。因此，本研究考察了疲劳对芭蕾舞演员下肢平衡、运动模式和肌肉活动的影响。20名健康的女性芭蕾舞演员在疲劳前后进行了半脚尖立踵动作。在任务执行过程中持续记录全身运动轨迹和主要下肢肌肉的肌肉活动。结果表明，疲劳会增加身体重心（COM）的内侧-外侧位移以及髋部和躯干的运动，但会降低COM速度和踝关节运动。此外，疲劳会降低腘绳肌和胫骨前肌的活动，但会增加比目鱼肌的活动。最后，更大程度地运用近端髋部和躯干运动来补偿疲劳的影响，导致更大的COM运动。总体而言，目前的研究结果表明，疲劳会导致运动控制受损，因此可能会增加舞蹈受伤的风险。
