Bermejo Jose Luis, García-Massó Xavier, Gomis Manuel, Noé Frederic, Huertas Florentino, Pablos Carlos, Paillard Thierry
Department of Physical Education, Catholic University of Valencia, Valencia, Spain.
Eur J Appl Physiol. 2015 Mar;115(3):489-95. doi: 10.1007/s00421-014-3038-z. Epub 2014 Nov 1.
It was supposed that the difficulty of postural tasks accentuates the effects of fatigue on postural stability. The aim of this work was to compare the effects of fatiguing running on three different postural conditions presenting different levels of difficulty: a standing still position with the eyes open (EO condition), a standing still position with the eyes closed (EC condition) and a shooting position with the eyes open (SP condition). The SP condition required a rifle to be held horizontally with the arms and a standing posture with the non-dominant foot ahead of the dominant foot.
Thirty-two male soldiers 32.2 ± 3.8 years old completed a maximal incremental protocol on a treadmill by running until they reached a state of fatigue. The three postural conditions were evaluated in a randomized order before and after the fatiguing exercise with the use of a force platform which recorded the displacements of the centre of foot pressure.
Following the fatiguing running exercise, postural stability was affected to a greater extent in the SP condition than in the EO condition and the EC condition.
The requirements of the SP condition modify the entire postural organization and this challenges balance control to a greater extent than when in EO and EC standing still positions, following fatiguing exercise. The difficulty of postural tasks thus amplifies the effects of fatigue on postural stability.
据推测，姿势任务的难度会加剧疲劳对姿势稳定性的影响。本研究的目的是比较疲劳跑步对三种不同难度姿势条件的影响：睁眼静止站立姿势（EO条件）、闭眼静止站立姿势（EC条件）和睁眼射击姿势（SP条件）。SP条件要求用手臂水平握持步枪，且非优势脚在优势脚前方的站立姿势。
32名年龄为32.2±3.8岁的男性士兵在跑步机上完成了递增负荷运动，一直跑到疲劳状态。在疲劳运动前后，使用测力平台以随机顺序对三种姿势条件进行评估，该平台记录了足底压力中心的位移。
疲劳跑步运动后，SP条件下的姿势稳定性受影响程度大于EO条件和EC条件。
SP条件的要求改变了整个姿势结构，与疲劳运动后睁眼和闭眼静止站立姿势相比，这对平衡控制的挑战更大。因此，姿势任务的难度会放大疲劳对姿势稳定性的影响。
