Fig. 2.

Typical responses to muscle stretching. A and B: substantial stretch reflexes (SRs) were evoked in response to both short- and long-amplitude stretches if they began to be applied to muscles that were previously not stretched in subjects 3 and 14, respectively. C and D: after several trials, SRs were attenuated but the IP remained in each stretched muscle. Calibration bars for EMG signals: 200 μV. E and F: IP duration and latency for large and small SR sizes. SR size = 1 when it exceeds the mean prestretch EMG level by 100% (group data) *P < 0.05.