Reflexes evoked in human thenar muscles during voluntary activity and their conduction pathways.
Responses evoked by an electrical stimulus to the median nerve in a small muscle of the human hand during a voluntary contraction have been examined. Two of these responses have been shown to be evoked through reflex pathways. The first, with a mean afferent conduction velocity of 64 m/s and estimated central delay of about 0.8 ms, is identified as an H reflex. The second response, which has an undefined central pathway, has a mean afferent conduction velocity of 43 m/s and an estimated central delay of about 17 ms.
D000328:Adult; D000344:Afferent Pathways / Q000502:physiology; D004558:Electric Stimulation; D004576:Electromyography; D005071:Evoked Potentials; D006181:H-Reflex; D006225:Hand / Q000294:innervation*; D006801:Humans; D008475:Median Nerve / Q000502:physiology; D009119:Muscle Contraction; D009431:Neural Conduction; D011930:Reaction Time / Q000502:physiology; D012023:Reflex, Monosynaptic; D013116:Spinal Cord / Q000502:physiology