Key result
Resistance to fatigue of fast motor units varied continuously in near linear relations to absorbance for succinate dehydrogenase of unit fibres and inversely to tetanic tension.
In rat motor units, fatigue resistance of neuromuscular transmission and excitation-contraction coupling is directly related to the oxidative enzyme activity (SDH) of the muscle fibers.
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Hypothesis-generating for fiber fatigue heterogeneity; leaves open translation to human cardiac or skeletal muscle performance.
Kugelberg et al. (1979) studied this question. Electrical stimulation was evaluated on Fatigue in rat anterior tibial motor units in relation to succinate dehydrogenase (SDH) activity. Resistance to fatigue of fast motor units varied continuously in near linear relations to absorbance for succinate dehydrogenase of unit fibres and inversely to tetanic tension.
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