Research

Journal of NeuroEngineering and Rehabilitation

, 9:39

Open Access This content is freely available online to anyone, anywhere at any time.

Effects of fatiguing isometric and isokinetic ankle exercises on postural control while standing on firm and compliant surfaces

  • Etienne J BissonAffiliated withSchool of Human Kinetics, Faculty of Health Sciences, University of OttawaAging and Movement Research Laboratory, Bruyère Research Institute Email author 
  • , Anthony RemaudAffiliated withAging and Movement Research Laboratory, Bruyère Research Institute Email author 
  • , Sébastien BoyasAffiliated withSchool of Human Kinetics, Faculty of Health Sciences, University of OttawaAging and Movement Research Laboratory, Bruyère Research Institute Email author 
  • , Yves LajoieAffiliated withSchool of Human Kinetics, Faculty of Health Sciences, University of Ottawa Email author 
  • , Martin BilodeauAffiliated withSchool of Human Kinetics, Faculty of Health Sciences, University of OttawaAging and Movement Research Laboratory, Bruyère Research InstituteSchool of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa Email author 

Abstract

Background

Fatiguing exercises used across studies to induce alterations in postural control are diverse and may explain the different findings reported. This study aimed to compare the effects of two types of fatiguing plantarflexion exercises on postural control on a firm and a compliant surface. Ten healthy young men (29 ± 4 years) were asked to stand as steadily as possible for 30 s, blindfolded with feet together, on a firm and a compliant surface before and immediately after an isometric and an isokinetic fatiguing exercise.

Results

Maximal force reduction due to fatigue was found significant but similar between exercises. No significant difference was found between the fatiguing exercises on all Center of Pressure (CoP) parameters. Both fatiguing exercises induced increases in CoP excursion area, CoP variability and CoP velocity in both planes (antero-posterior, mediolateral) on the compliant surface. On the firm surface, both fatiguing exercises only induced increases in CoP variability and CoP velocity in the fatigued plane (antero-posterior).

Conclusions

Isometric and isokinetic fatiguing exercises, when producing a similar level of force reduction, induce similar decreases in postural control. The effects of fatigue on postural control in healthy young men are more pronounced when standing on a compliant surface, i.e. when proprioceptive information at the ankle is altered.

Keywords

Neuromuscular fatigue Posturography Centre of Pressure Contraction mode Plantarflexor muscles