Coordination of plantar flexor muscles during bipedal and unipedal stances in young and elderly adults

Experimental Brain Research
Tatsunori WatanabeIppei Nojima

Abstract

To investigate the effects of aging on coordination of plantar flexor muscles during bipedal and unipedal stances, we examined a relationship between the center of pressure sway and electromyographic activity of these muscles, and also the common neural input, using a coherence analysis. Healthy young and elderly adults were asked to perform bipedal and unipedal standing. The electromyograms were recorded unilaterally from the medial and lateral gastrocnemius (MG and LG) and soleus (SL) muscles, and the common input was analyzed for MG-LG, MG-SL, and LG-SL pairs in two frequency bands: a delta band, that is associated with force variability, and a beta band, that could reflect the corticospinal drive. Main results indicated that the MG and SL muscles worked for lateral sway, while the LG muscle worked for medial sway during the unipedal stance. The delta-band coherence for the MG-SL pair and the beta-band coherences for all the pairs were larger during the unipedal than bipedal stance for both groups. The delta-band coherence for the MG-SL pair was larger for the elderly than young adults during the unipedal stance. In addition, the beta-band coherence for the MG-SL pair was larger than the other pairs during the unipedal stanc...Continue Reading

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Citations

Apr 10, 2021·NeuroImage·Tatsunori WatanabeHikari Kirimoto
May 16, 2021·Scientific Reports·Tatsunori WatanabeShin Ishihara
Jun 28, 2021·Human Movement Science·Lisanne B M BakkerTibor Hortobágyi

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