Journal of Applied Physiology
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J Appl Physiol (October 19, 2001). doi:10.1152/japplphysiol.00479.2001
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Articles in PresS, published online ahead of print October 19, 2001
J Appl Physiol, 10.1152/jap.00479.2001
Submitted on May 17, 2001
Accepted on October 17, 2001

Damage in different types of motor units following repeated active lengthenings of the medial gastrocnemius muscle of the cat

Camilla L Brockett1, David L Morgan2, John E Gregory1, and Uwe Proske1*

1 Physiology, Monash University, Melbourne, Victoria, Australia
2 Electrical & Computer Systems Engineering, Monash University, Melbourne, Victoria, Australia

* To whom correspondence should be addressed. E-mail: uwe.proske{at}med.monash.edu.au.

Slow-twitch motor units in the medial gastrocnemius muscle of the anaesthetised cat were found to have an average optimum length for active tension that was 0.8 (± 0.5 S.E.M.) mm longer than the whole muscle optimum. For fast-twitch units (time-to-peak < 50 ms) the average optimum was 1.3 (± 0.3) mm shorter than the whole muscle optimum. After the muscle had been subjected to 10 stretches while maximally activated, beginning at the whole muscle optimum length, the optimum lengths of the 27 fast-twitch motor units had shifted significantly further in the direction of longer muscle lengths (mean 4.3 ± 0.3 mm) than for the 8 slow-twitch units, (2.1 ± 0.4 mm). A shift in the muscle's length-tension relation was interpreted as due to muscle damage. Statistical analysis showed that a motor unit's optimum length for a contraction, relative to the whole muscle optimum, was a better indicator of the unit's susceptibility to damage from active lengthenings than motor unit type.




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