Object: The purpose of this study was to establish the normal values of sternocleidomastoid
(SCM) tendon reflex in normal Korean adults.
Method: The study for SCM tendon reflex was performed in 41 normal adults using electric
reflex hammer. The compound muscle action potentials (CMAP) of SCM muscle were obtained
by SCM tendon tapping. From 5 repeated trials of each subject, the shortest latency and the largest
peak-to-peak amplitude of CMAP were chosen for the representative value.
Results: Mean values of latency and amplitude were 2.19±0.27 msec and 0.70±0.38 mV
for SCM tendon reflex. There was no significant difference in the latency and amplitude
regardless of side or sex (p＞0.05). The age and height showed no signifiant correlation with
latency and amplitude of SCM tendon reflex (p＞0.05).
Conclusion: We believe that our results can be used as an evaluation method of upper cervical