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. 1993 Jan;460:573–580. doi: 10.1113/jphysiol.1993.sp019487

Asynchronous increases in oxidative capacity and resistance to fatigue of electrostimulated muscles of rat and rabbit.

J A Simoneau 1, M Kaufmann 1, D Pette 1
PMCID: PMC1175229  PMID: 8487208

Abstract

1. The present study investigates to what extent increases in resistance to fatigue and aerobic oxidative capacity of energy metabolism are correlated in fast-twitch tibialis anterior muscles of rat and rabbit subjected to chronic low-frequency stimulation. 2. Changes in the aerobic oxidative capacity of the stimulated muscles were judged from increases in citrate synthase activity, representing the constant-proportion enzyme group of the citric acid cycle. 3. Resistance to fatigue reached maximal values in both rat and rabbit tibialis anterior muscles after stimulation periods of 14 days, whereas citrate synthase activity continued to increase with longer stimulation periods. 4. Different time courses of the changes in resistance to fatigue and citrate synthase activity were observed not only with prolonged stimulation periods but also during the first week, when pronounced increases in resistance to fatigue were accompanied by only moderate elevations in citrate synthase activity. 5. The dissociation between the changes of the two parameters studied suggests that factors other than elevated aerobic oxidative capacity contribute to enhanced resistance to fatigue.

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Selected References

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