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Experimental Brain Research

, Volume 234, Issue 6, pp 1363–1375 | Cite as

Influence of temporal pressure constraint on the biomechanical organization of gait initiation made with or without an obstacle to clear

  • Eric YiouEmail author
  • Paul Fourcade
  • Romain Artico
  • Teddy Caderby
Research Article

Abstract

Many daily motor tasks have to be performed under a temporal pressure constraint. This study aimed to explore the influence of such constraint on motor performance and postural stability during gait initiation. Young healthy participants initiated gait at maximal velocity under two conditions of temporal pressure: in the low-pressure condition, gait was self-initiated (self-initiated condition, SI); in the high-pressure condition, it was initiated as soon as possible after an acoustic signal (reaction-time condition, RT). Gait was initiated with and without an environmental constraint in the form of an obstacle to be cleared placed in front of participants. Results showed that the duration of postural adjustments preceding swing heel-off (“anticipatory postural adjustments”, APAs) was shorter, while their amplitude was larger in RT compared to SI. These larger APAs allowed the participants to reach equivalent postural stability and motor performance in both RT and SI. In addition, the duration of the execution phase of gait initiation increased greatly in the condition with an obstacle to be cleared (OBST) compared to the condition without an obstacle (NO OBST), thereby increasing lateral instability and thus involving larger mediolateral APA. Similar effects of temporal pressure were obtained in NO OBST and OBST. This study shows the adaptability of the postural system to temporal pressure in healthy young adults initiating gait. The outcome of this study may provide a basis for better understanding the aetiology of balance impairments with the risk of falling in frail populations while performing daily complex tasks involving a whole-body progression.

Keywords

Postural stability Motor performance Temporal pressure Anticipatory postural adjustments Gait initiation 

Notes

Conflict of interest

None of the authors have financial or other conflicts interest in regard to this research.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Eric Yiou
    • 1
    Email author
  • Paul Fourcade
    • 1
  • Romain Artico
    • 1
  • Teddy Caderby
    • 2
  1. 1.CIAMS Laboratory, EA 4532, UFR STAPSUniversity of Paris-SudOrsayFrance
  2. 2.DIMPS Laboratory, EA 4075, UFR STAPSUniversity of La RéunionSaint-DenisFrance

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