Effect of desynchronized inputs on compound sensory and muscle action potentials

✍ Scribed by Dr. Jun Kimura; Yoko Sakimura; Masafumi Machida; Yasunori Fuchigami; Tetsuro Ishida; Detlef Claus; Shigeki Kameyama; Yuji Nakazumi; Jin Wang; Thoru Yamada

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 606 KB
• Volume: 11
• Category: Article
• ISSN: 0148-639X
• DOI: 10.1002/mus.880110705

✦ Synopsis

Stimulation of the second (S,) or third (S, ) digit elicits a median sensory potential at the wrist. Similarly, a shock applied to the median ( S, ) or ulnar (S,) nerve at the wrist evokes a sensory potential of the fourth digit and a muscle potential over the thenar eminence. Hence, a concomitant application of S, and S2 or S, and S, with varying interstimulus intervals simulates the effect of desynchronized inputs. In 10 hands, a shift in latency on the order of 1 rnsec between S, and S, or S, and S, caused a major reduction in sensory potential by as much as 30-40°/o but little change in muscle action potential. A latency difference slightly less than one-half the total duration of unit discharge maximized the phase cancellation between the two components and consequently the loss of area under the waveform.