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Department of Physiology, Northwestern University Medical School, Chicago, Illinois 60611
Received 14 March 1996; accepted in final form 13 December 1996.
Sandercock, Thomas G., and C. J. Heckman. Doublet
potentiation during eccentric and concentric contractions of cat soleus
muscle. J. Appl. Physiol. 82(4):
1219-1228, 1997.
The addition of an extra stimulus pulse, or
doublet, at the beginning of a low-frequency train has been shown to
substantially increase isometric force. This study examined the effects
of muscle movement on this doublet potentiation. The soleus muscles of
anesthetized cats were stimulated at 10 Hz for 1 s, with and without an
added doublet (0.01-s interval). Isovelocity releases reduced but did
not eliminate peak and early doublet potentiation (average 0.0-0.5
s after the doublet). Large releases, >0.4 s after the doublet,
completely abolished sustained doublet potentiation (average
0.5-1.0 s after the doublet). In contrast, early isovelocity
stretches boosted peak doublet potentiation. Yet, large stretches later
in the stimulus almost completely eliminated sustained doublet
potentiation. This suggests that a different mechanism is responsible
for early and sustained doublet potentiations. Because peak and average
initial doublet potentiation were not strongly affected by movement,
doublets still offer a viable control strategy to increase force during movement while minimizing the number of stimulus pulses.
catch; motor control; fatigue
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