Pyruvate dehydrogenase activation in inactive muscle during and after maximal exercise in men
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Pyruvate dehydrogenase activity (PDHa) and acetyl-group accumulation were examined in the inactive deltoid muscle in response to maximal leg exercise in men. Seven subjects completed three consecutive 30-s bouts of maximal isokinetic cycling, with 4-min rest intervals between bouts. Biopsies of the deltoid were obtained before exercise, after bouts 1 and 3, and after 15 min of rest recovery. Inactive muscle lactate (LA) and pyruvate (PYR) contents increased more than twofold (P < 0.05) after exercise (bout 3) and remained elevated after 15 min of recovery (P < 0.05). Increased PYR accumulation secondary to LA uptake by the inactive deltoid was associated with greater PDHa, which progressively increased from 0.71 +/- 0.23 mmol. min-1. kg wet wt-1 at rest to a maximum of 1.83 +/- 0.30 mmol. min-1. kg wet wt-1 after bout 3 (P < 0.05) and remained elevated after 15 min of recovery (1.63 +/- 0.24 mmol. min-1. kg wet wt-1; P < 0.05). Acetyl-CoA and acetylcarnitine accumulations were unaltered. Increased PDHa allowed and did not limit the oxidation of LA and PYR in inactive human skeletal muscle after maximal exercise.
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