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Changes in the relative contribution of each leg to the control of quiet two-legged stance following unilateral plantar-flexor muscles fatigue.
- Source :
-
European Journal of Applied Physiology . Sep2010, Vol. 110 Issue 1, p207-213. 7p. 3 Graphs. - Publication Year :
- 2010
-
Abstract
- We used unilateral plantar-flexor muscles fatigue to assess the capacity of the central nervous system to adapt quiet two-legged stance control to a unilateral ankle neuromuscular perturbation. Eighteen young healthy adults stood barefoot with their eyes closed and were asked to sway as little as possible. The Experimental group (n = 9) executed this postural task in two conditions, before (pre-test) and following the completion of a fatiguing exercise designed to induce a muscular fatigue in the plantar-flexor muscles of their dominant leg (post-test). For the Control group (n = 9), this fatiguing exercise was replaced with a standing rest period corresponding to the fatiguing exercise. Results of the Experimental group showed no significant difference between the weightbearing index measured in the pre-test condition and that observed in the post-test condition. Results further revealed that unilateral plantar-flexor muscles fatigue yielded different effects on the centre of foot pressure (CoP) displacements under the non-fatigued leg and under the fatigued leg: a wider surface area of the CoP displacements was observed under the non-fatigued than under the fatigued leg, and a higher mean speed of the CoP displacements was observed under the non-fatigued leg only in the post-test relative to the pre-test condition. These findings evidenced that the contribution of each leg to the control of quiet two-legged stance is modified as a result of muscle fatigue of unilateral plantar-flexor muscles. The greater contribution of the non-fatigued leg could be viewed as a fatigue-induced adaptive change in the control of quiet two-legged stance in response to an alteration of the unilateral ankle neuromuscular function induced by unilateral plantar-flexor muscles fatigue. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MUSCLES
*FATIGUE (Physiology)
*FLEXOR tendons
*CENTRAL nervous system
*PHYSICAL activity
*SKELETAL muscle physiology
*PHYSIOLOGICAL adaptation
*ANKLE
*CEREBRAL dominance
*COMPARATIVE studies
*POSTURAL balance
*LEG
*RESEARCH methodology
*MEDICAL cooperation
*MUSCLE contraction
*PRESSURE
*RESEARCH
*EVALUATION research
*RANDOMIZED controlled trials
*SKELETAL muscle
*WEIGHT-bearing (Orthopedics)
*MUSCLE fatigue
*INNERVATION
Subjects
Details
- Language :
- English
- ISSN :
- 14396319
- Volume :
- 110
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- European Journal of Applied Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 52836333
- Full Text :
- https://doi.org/10.1007/s00421-010-1449-z