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Short-term training attenuates muscle TCA cycle expansion during exercise in women.
Journal of Applied Physiology 2003 September
Muscle glycogenolytic flux and lactate accumulation during exercise are lower after 3-7 days of "short-term" aerobic training (STT) in men (e.g., Green HJ, Helyar R, Ball-Burnett M, Kowalchuk N, Symon S, and Farrance B. J Appl Physiol 72: 484-491, 1992). We hypothesized that 5 days of STT would attenuate pyruvate production and the increase in muscle tricarboxylic acid cycle intermediates (TCAI) during exercise, because of reduced flux through the reaction catalyzed by alanine aminotransferase (AAT; pyruvate + glutamate <--> 2-oxoglutarate + alanine). Eight women [22 +/- 1 yr, peak oxygen uptake (Vo2 peak) = 40.3 +/- 4.6 ml. kg-1. min-1] performed seven 45-min bouts of cycle exercise at 70% Vo2 peak over 9 days (1 bout/day; rest only on days 2 and 8). During the first and last bouts, biopsies (vastus lateralis) were obtained at rest and after 5 and 45 min of exercise. Muscle glycogen concentration was approximately 50% higher at rest after STT (493 +/- 38 vs. 330 +/- 20 mmol/kg dry wt; P
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