Flexor carpi radialis response following a perturbation

EMG signal of the response of the flexor carpi radialis muscle of the non-dominant arm of six subjects was recorded after a mechanical pulse perturbation was applied to the forward stretched forearm. Two parameters were defined; the reflex onset time is the time elapsed between the perturbation application and the reflex activation, and the reflex magnitude is the magnitude of the reflex signal. Both variables were found independent of the perturbation characteristics (pulse magnitude and duration) and the muscle activity level.