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Fig. 3. Sustained effect of eccentric exercise on isometric force-length
characteristics for submaximally stimulated muscle. (A) Submaximal isometric
force-length characteristics before (pre-exercise, closed symbols) and 80 min
after a series of eccentric contractions (post-exercise, open symbols) (mean
± S.E.M.). Data were collected before
(circles) and after (triangles) a potentiating tetanus, which caused
post-tetanic potentiation (PTP). Exercise reduced submaximal force (obtained
with a stimulation frequency of 60 Hz), whereas the potentiating tetanus
raised force at most muscle lengths. (B) Submaximal isometric force-length
relationship post-exercise, expressed relative to the pre-exercise values.
Different effects of muscle length were found in the potentiated (triangles)
compared with the non-potentiated (circles) condition. *Significant
difference between non-potentiated and potentiated condition.
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