Spinal mechanisms in postactivation potentiation: facilitation of presynaptic inhibition contrasts H-reflex amplitude reduction

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Abstract
This study provides evidence that postactivation potentiation is accompanied by a reduction in soleus H-reflex amplitude and a concurrent facilitation of presynaptic spinal mechanisms. By combining global EMG and single motor unit analyses extracted from high-density surface EMG, we reveal a dissociation between spinal disinhibition and reflex depression. These findings suggest that acute postcontraction reflex suppression might be mediated by mechanisms other than presynaptic inhibition, potentially involving postactivation depression or changes in muscle spindle sensitivity.
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Funding Information
  • The Slovenian Research and Innovation Agency (P2-0041)
  • The Slovenian Research and Innovation Agency (J2-1731)
  • The Slovenian Research and Innovation Agency (P5-0381)
  • The Slovenian Research and Innovation Agency (P2-0041)
  • Horizon Europe Research and Innovation Program (101079392)
  • The Slovenian Research and Innovation Agency (MN-0036)

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