#3913. Trunk angle modulates feedforward and feedback control during single-limb squatting

September 2026publication date
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Journal’s subject area:
Sport Science
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Abstract:
Trunk positioning and unexpected perturbations are high-risk conditions at the time of anterior cruciate ligament injury. We tested the influence of trunk position on feedforward and feedback control during unexpected perturbations while performing a novel single-limb squatting task. We also assessed the degree that feedforward control was predictive of feedback responses. Soleus long-latency reflexes increased more than 100% from feedforward muscle activity regardless of trunk condition. Feedfor-ward muscle activity differentially predicted long-latency reflex responses depending on the muscle (R2: 0.47–0.97). These findings support the concept that trunk positioning influences motor control responses to perturbation and that feedback responses may be invariant to the feedforward control strategy.
Keywords:
Central set; Knee; Motor control; Perturbation; Reflex; Soleus

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