J Korean Acad Rehabil Med.  2007 Aug;31(4):466-471.

H-reflexes in the Flexor Carpi Radialis with Facilitation and with Facilitation & Averaging: Normative Data

• Chung SH
• Park YS
• Woo KB
• Ryu DG
• Lim GN
• Kim JH

Abstract

OBJECTIVE
To determine the normal values of flexor carpi radialis (FCR) H-reflex without facilitation, with facilitation and with facilitation & averaging. And to compare the three methods. METHOD: The FCR H-reflex was tested in 60 healthy people. 1) H-reflexes was recorded in the FCR muscle without facilitation. 2) H-reflexes was recorded in the FCR muscle with facilitation and facilitation was carried out by contracting the FCR muscle with 1 kg of weight. 3) FCR H-reflex was tested by repetitive stimulation with facilitation and the multiple responses were averaged.
RESULTS
Without facilitation, FCR H-reflexes were elicited only in 24 people out of 60 people and with facilitation, FCR H-reflexes were elicited in all 60 people. The mean latencies and amplitudes of the three methods were measured and normal limits of latency difference and amplitude ratio were calculated. In the FCR H-reflex without facilitation, with facilitation and with facilitation & averaging, the normal limits of latency difference were 1.0 msec, 1.0 msec, 1.1 msec and normal limits of amplitude ration were 0.37, 0.22, 0.57.
CONCLUSION
FCR H-reflex with facilitation and with facilitation & averaging might be useful in the clinical diagnosis.

Keyword

H-reflex; Flexor carpi radialis; Facilitation

MeSH Terms

Diagnosis
H-Reflex*
Reference Values