Soleus H-reflex modulation and paired reflex depression from prone to standing and from standing to walking.
Patterns of soleus H-reflex modulation as a function of posture, task, and reflex activation history were assessed with three experimental paradigms: lying prone compared with standing unsupported; standing compared with the initiation of walking; and standing compared with the mid stance phase of walking. Paired H-reflexes, 80 ms apart, were evoked under each condition. The paired reflex depression (PRD), the percentage depression of the second H-reflex relative to the first H-reflex, was modulated independently of the first H-reflex across the postures and tasks. These results reveal divergent patterns of segmental reflex modulation and support the idea that segmental reflexes are controlled by multiple mechanisms.
Jeon
Hye-Seon
HS
Department of Physical Therapy, Yonsei University, Wonju, Kangwondo, Korea. hyeseonj@dragon.yonsei.ac.kr
Kukulka
Carl G
CG
Brunt
Denis
D
Behrman
Andrea L
AL
Thompson
Floyd J
FJ
D000328:Adult; D004576:Electromyography; D005260:Female; D005684:Gait / Q000502:physiology*; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D009433:Neural Inhibition / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D016138:Walking / Q000502:physiology*