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The present study focused on the effects of trunk extensor muscles fatigue onpostural control during quiet standing under different somatosensory conditionsfrom the foot and the ankle. With this aim, 20 young healthy adults were askedto stand as immobile as possible in two conditions of No fatigue and Fatigue oftrunk extensor muscles. In Experiment 1 (n = 10), somatosensation from the footand the ankle was degraded by standing on a foam surface. In Experiment 2 (n =10), somatosensation from the foot and ankle was facilitated through theincreased cutaneous feedback at the foot and ankle provided by strips ofathletic tape applied across both ankle joints. The centre of foot pressuredisplacements (CoP) were recorded using a force platform. The results showedthat (1) trunk extensor muscles fatigue increased CoP displacements undernormal somatosensatory conditions (Experiment 1 and Experiment 2), (2) thisdestabilizing effect was exacerbated when somatosensation from the foot and theankle was degraded (Experiment 1), and (3) this destabilizing effect wasmitigated when somatosensation from the foot and the ankle was facilitated(Experiment 2). Altogether, the present findings evidenced re-weighting ofsensory cues for controlling posture during quiet standing following trunkextensor muscles fatigue by increasing the reliance on the somatosensory inputsfrom the foot and the ankle. This could have implications in clinical andrehabilitative areas.

experimental brain research

Re-weighting of somatosensory inputs from the foot and the ankle for  controlling posture during quiet standing following trunk extensor muscles  fatigue