Balance Control and Motor Performance (EPM), UFR STAPS, Henri Poincaré University, Nancy-University, 54600 Villers-lès-Nancy, France.
J Electromyogr Kinesiol. 2010 Dec;20(6):1196-202. doi: 10.1016/j.jelekin.2010.07.016. Epub 2010 Aug 24.
To study the effect of exercise and dehydration on the postural sensory-motor strategies, 10 sportsmen performed a 45 min-exercise on a cycle ergometer at intensity just below the ventilatory threshold without fluid intake. They performed, before, immediately and 20 min after exercise, a sensory organization test to evaluate balance control in six different sensory situations, that combine three visual conditions (eyes open, eyes closed and sway-referenced visual surround motion) with two platform conditions (stable platform, sway-referenced platform motion). Blood samples were collected before and after exercise. Exercise induced a mild dehydration, characterized by body mass loss and increase in proteinemia. Postural performances decreased immediately after exercise, mainly in the standard situation (eyes open, stable visual surround and platform) and when only the vestibular cue was reliable (eyes closed and sway-referenced platform). Moreover, the decreased use of vestibular input was correlated with the dehydration level. Finally, postural performances normalized 20 min after exercise. Even though muscular fatigue could explain the decrease in postural performances, vestibular fluid modifications may also be involved by its influence on the intralabyrinthine homeostasis, lowering thus the contribution of vestibular information on balance control.
为了研究运动和脱水对姿势感觉运动策略的影响，10 名运动员在没有液体摄入的情况下，以低于通气阈值的强度在自行车测力计上进行了 45 分钟的运动。他们在运动前、运动后立即和运动后 20 分钟进行了感觉组织测试，以评估在六个不同的感觉情况下的平衡控制，这些情况将三种视觉条件（睁眼、闭眼和参照摆动的视觉周围运动）与两种平台条件（稳定平台、参照摆动的平台运动）相结合。在运动前后采集血液样本。运动导致轻度脱水，表现为体重减轻和蛋白质血症增加。运动后立即出现姿势表现下降，主要在标准情况下（睁眼、稳定的视觉周围和平台）和只有前庭线索可靠时（闭眼和参照摆动的平台）。此外，前庭输入的减少与脱水水平相关。最后，运动后 20 分钟时，姿势表现恢复正常。尽管肌肉疲劳可以解释姿势表现的下降，但前庭液的变化也可能涉及其中，因为它影响内耳的内环境稳定，从而降低了前庭信息对平衡控制的贡献。
