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1 Department of Physiology,
Seven untrained
volunteers [3 men, 4 women, 20.1 ± 2.0 (SD) yr, 66.0 ± 11.0 kg, 171 ± 13 cm] participated in a 10-day cycle exercise
training program. Resting muscle samples were obtained from vastus
lateralis before and after 5 and 10 days of training. Mitochondrial ATP
production rate (MAPR) was assayed in isolated mitochondria by using a
bioluminescence technique and referenced to the activity of glutamate
dehydrogenase in the muscle sample. MAPR increased 136 and 161% after
10 days of training for the mitochondrial substrate combinations
pyruvate + palmitoyl-L-carnitine +
-ketoglutarate + malate and
palmitoyl-L-carnitine + malate, respectively. Total muscle glutamate dehydrogenase and citrate synthase
activity increased 53 and 16%, respectively, after 5 days but did not
significantly increase further after 10 days. The results from the
present study indicate that MAPR, measured by using the substrate
combinations pyruvate + palmitoyl-L-carnitine +
-ketoglutarate + malate and
palmitoyl-L-carnitine + malate, can rapidly increase in response to endurance training.
adenosine 5'-triphosphate production rate; luminescence
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