Université de Pau et des Pays de l'Adour, Département STAPS, ZA Bastillac Sud, Tarbes, France.
Neuroscience. 2010 Feb 17;165(4):1471-5. doi: 10.1016/j.neuroscience.2009.11.052. Epub 2009 Dec 1.
Fatiguing exercise of the quadriceps femoris muscle degrades postural control in human subjects. The aim of this work was to compare the effects of the fatigue of the quadriceps femoris induced by voluntary muscular contraction (VC), and by electrical stimulation (ES) superimposed onto voluntary muscular contraction (VC+ES), on postural control and muscle strength. Fourteen healthy young adults participated in the study. Postural control and muscle strength were evaluated using a stable force platform and an isokinetic dynamometer, respectively, before (PRE condition) and after the completion of each fatiguing exercise (immediately: POST condition; after a 5 min recovery time: POST 5 condition). In POST, both postural control and muscle strength were impaired by both fatiguing exercises. However, the impairment was higher for VC than for VC+ES. In POST 5, for both fatiguing exercises, postural control recovered its initial level while muscle strength did not. These results suggest that superimposing ES onto voluntary muscular contractions (VCs) impaired muscle strength and postural control less than did VCs alone. However the duration of recovery of these two neurophysiological functions did not differ for the two fatiguing exercises. For both exercises, postural control was restored faster than the ability to produce muscular strength.
股四头肌的疲劳性运动可降低人体的姿势控制能力。本研究旨在比较由主动肌肉收缩（VC）引起的股四头肌疲劳，以及叠加在主动肌肉收缩上的电刺激（VC+ES）引起的疲劳对姿势控制和肌肉力量的影响。14 名健康的年轻成年人参与了这项研究。使用稳定力平台和等速测力计分别在疲劳运动前（PRE 条件）和完成后（即刻：POST 条件；5 分钟恢复期后：POST 5 条件）评估姿势控制和肌肉力量。在 POST 条件下，两种疲劳运动都会导致姿势控制和肌肉力量下降，但 VC 引起的下降幅度大于 VC+ES。在 POST 5 条件下，对于两种疲劳运动，姿势控制都恢复到了初始水平，而肌肉力量没有恢复。这些结果表明，与单独使用 VC 相比，叠加 ES 会降低肌肉力量和姿势控制的受损程度，但这两种神经生理功能的恢复时间并没有因两种疲劳运动而不同。对于这两种运动，姿势控制的恢复速度都比产生肌肉力量的能力快。
