Fig. 7. 



A. Post-inhibitory exaltation. The tracing is from the knee-extensor, vastocrureiis. The muscle is at the 

 outset of the tracing exhibiting tonic contraction, for it is taking part in the postural reflex of standing 

 which involves maintained extension of knee. A stimulus is then applied (see notch in signal hne 

 below) appropriate for producing knee-flexion. The vastocrureus is immediately relaxed (descent of 

 myograph line) by reflex inhibition, and remains relaxed so long as the stimulus continues. The 

 stimulus is then withdrawn and the muscle re-exhibits contraction (rebound contraction), and this 

 contraction is greatly in excess of the grade of the contraction it exhibited prior to the reflex inhibition. 

 Time in quarter seconds above. B. When the inhibition is weak no post-inhibitory exaltation is as a 

 rule evident, 



