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To investigate how changes in ankle position affect shared neural inputs across triceps surae muscles during ankle plantarflexions, high density surface electromyography was used to measure motor units in the medial and lateral compartments of the soleus (SM, SL) and gastrocnemius (GM, GL) in sixteen healthy adults. Participants performed isometric plantarflexions at 20% maximal voluntary contraction (MVC) at three ankle positions: 20° plantarflexion (PF), neutral (PF0°), and 20° dorsiflexion (DF). Intermuscular coherence of GM-GL and SM-SL in the delta, alpha and beta bands were analyzed. Results showed that force fluctuations decreased with greater ankle dorsiflexion. Regardless of the muscle pair, alpha band coherence was highest at PF20°, and beta band coherence was lowest at the neutral position. Delta-band coherence between GM-GL was consistently higher than that of SM-SL at all positions. Changing ankle positions impacts shared neural inputs in the alpha and beta bands across triceps surae muscles.

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The Shared Neural Drive Across Triceps Surae Muscles Changes with Ankle Positions

  • 会议论文

  • 发表日期：

    2025年

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  • Xin Sienna Yu,
  • Jackson Levine,
  • Rebecca Schwanemann,
  • Jose L. Pons

摘要

To investigate how changes in ankle position affect shared neural inputs across triceps surae muscles during ankle plantarflexions, high density surface electromyography was used to measure motor units in the medial and lateral compartments of the soleus (SM, SL) and gastrocnemius (GM, GL) in sixteen healthy adults. Participants performed isometric plantarflexions at 20% maximal voluntary contraction (MVC) at three ankle positions: 20° plantarflexion (PF), neutral (PF0°), and 20° dorsiflexion (DF). Intermuscular coherence of GM-GL and SM-SL in the delta, alpha and beta bands were analyzed. Results showed that force fluctuations decreased with greater ankle dorsiflexion. Regardless of the muscle pair, alpha band coherence was highest at PF20°, and beta band coherence was lowest at the neutral position. Delta-band coherence between GM-GL was consistently higher than that of SM-SL at all positions. Changing ankle positions impacts shared neural inputs in the alpha and beta bands across triceps surae muscles.