Human soleus H-reflex excitability is decreased by dynamic head-and-body tilts.
The modulation of soleus (SO) H-reflex excitability during dynamic whole head-and-body tilts (WHBT) was investigated in normal healthy subjects. Between 30 and 70 ms, and 151 and 190 ms after head acceleration onset, the H-reflex amplitude was smaller than during quiet standing by 7.6% (p < 0.01) and 15.4% (p = 0.06) respectively. This finding suggested that dynamic WHBT reduced the excitability of the predominantly monosynaptic stretch reflex are in the majority of the subjects studied.
Paquet
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N
School of Physical and Occupational Therapy, Faculty of Medicine, McGill University, Montreal, Québec, Canada. npaque@po-box.mcgill.ca
Hui-Chan
C W
CW
D000328:Adult; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology*; D012016:Reference Values; D012026:Reflex, Stretch / Q000502:physiology; D018667:Tilt-Table Test