Influence of temporal pressure on anticipatory postural control of medio-lateral stability during rapid leg flexion
- 作者：E. Yiou ; e.yiou@libertysurf.fr ; T. Hussein ; J. LaRue
- 关键词：Anticipatory postural adjustments ; Temporal pressure ; Dynamic stability ; Leg flexion
- 刊名：Gait and Posture
- 出版年：2012
- 期刊代码：106_09666362
- 类别：med
- 出版时间：March, 2012
- 卷：35
- 期：3
- 页码：494-499
- 文件大小：519 K
摘要
During leg flexion from erect posture, postural stability along the medio-lateral direction is organized in advance during 鈥渁nticipatory postural adjustments鈥?(APAs). This study aimed to investigate the influence of temporal pressure on this anticipatory postural control of medio-lateral stability. Eight young healthy participants performed series of leg flexions (1) as soon as possible in response to an acoustic signal (reaction-time condition; condition with temporal pressure) and (2) in a self-initiated condition (no temporal pressure). Results showed that APAs duration was shorter in the reaction-time condition as compared to the self-initiated condition; this shortening was compensated by an increase in the medio-lateral center-of-pressure displacement so that the dynamic stability reached at foot-off, as measured by the 鈥渆xtrapolated center-of-mass鈥? remained unchanged. It is concluded that when a complex task is performed under temporal pressure, the central nervous system is able to modulate the spatio-temporal features of APAs in a way to both hasten the initiation of the voluntary movement and maintain optimal conditions of dynamic stability. In other words, it seems that the central nervous system does not 鈥渢rade off optimal stability for speed of movement initiation under reaction-time condition鈥? as it had been proposed in the literature.