Effects of plantar flexor muscle fatigue induced by electromyostimulation on postural coordination.
The aim of the present study was to investigate the influence of a modification of an intrinsic capacity (plantar flexor strength) on the implementation of in-phase and anti-phase mode of coordination. Analysis of hip and ankle relative phases during fore-aft tracking task was done before and after an electromyostimulation fatigue protocol on the soleus muscles. Results showed participants used exclusively in-phase and anti-phase modes of coordination, with a sudden switch from one to the other with target frequency increase. Regarding tracking tasks, fatigue induces a decrease of performance for lower frequencies, and a significant decrease of switch frequency (-0.08 Hz) for each subject. In conclusion, changes in mode of coordination implementation suggest that the in-phase mode implementation is highly linked to the strength production capacity at the ankle joint.
Ponce
Antoine
A
Inserm, ERM207, Université de bourgogne, Dijon, F-21079, France. antoine.ponce@u-bourgogne.fr
Fouque
Florent
F
Cahouët
Violaine
V
Martin
Alain
A
D000222:Adaptation, Physiological / Q000502:physiology*; D000328:Adult; D000842:Ankle / Q000502:physiology; D004558:Electric Stimulation; D006615:Hip / Q000502:physiology; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology*; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D011187:Posture / Q000502:physiology*