Decreased gastrocnemius temporal muscle activation during gait in elderly women with history of recurrent falls.

摘要

Gait dysfunction is a strong issue in elderly women with a history of falls. The purpose of this study was to compare the temporal activity of the ankle muscles during gait in elderly women with and without a history of recurrent falls. Eighty-nine (89) elderly women - one group with a history of falls (45) and another group without (44) - participated in the study. The mean range of temporal activation of the gastrocnemius, tibialis anterior and soleus muscles during gait was obtained using electromyography. The muscles were considered active when the signal magnitude surpassed two standard deviations of the minimal magnitude of the average signal per individual. The results showed that the mean range of gastrocnemius muscle activation of the group of recurrent fallers was significantly shorter, 2.9% (16.9+/-5.7%) compared to the group without recurrent falls (19.8+/-6.6%) (p=0.004). The shorter duration in the gastrocnemius muscle activation during stance could possibly affect stability in the support phase, since the gastrocnemius is the main decelerator of the trunk. Clinically, this finding shows the importance of rehabilitation programs for elderly women that focus on strengthening the plantar flexor musculature aiming to reestablish the function and stability of gait and possibly avoiding falls.