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J Appl Physiol 87: 2037-2042, 1999;
8750-7587/99 $5.00
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Vol. 87, Issue 6, 2037-2042, December 1999

Purine loss after repeated sprint bouts in humans

C. G. Stathis1, S. Zhao1, M. F. Carey1, and R. J. Snow2

1 Exercise Metabolism Unit, Centre for Rehabilitation, Exercise and Sport Science, Victoria University of Technology, Footscray 3011; and 2 School of Human Movement, Deakin University, Burwood 3125, Australia

The influence of the number of sprint bouts on purine loss was examined in nine men (age 24.8 ± 1.6 yr, weight 76 ± 3.9 kg, peak O2 consumption 3.87 ± 0.16 l/min) who performed either one (B1), four (B4), or eight (B8) 10-s sprints on a cycle ergometer, 1 wk apart, in a randomized order. Forearm venous plasma inosine, hypoxanthine (Hx), and uric acid concentrations were measured at rest and during 120 min of recovery. Urinary inosine, Hx, and uric acid excretion were also measured before and 24 h after exercise. During the first 120 min of recovery, plasma inosine and Hx concentrations, and urinary Hx excretion rate, were progressively higher (P < 0.05) with an increasing number of sprint bouts. Plasma uric acid concentration was higher (P < 0.05) in B8 compared with B1 and B4 after 45, 60, and 120 min of recovery. Total urinary excretion of purines (inosine + Hx + uric acid) was higher (P < 0.05) at 2 h of recovery after B8 (537 ± 59 µmol) compared with the other trials (B1: 270 ± 76; B4: 327 ± 59 µmol). These results indicate that the loss of purine from the body was enhanced by increasing the number of intermittent 10-s sprint bouts.

intermittent exercise; inosine; hypoxanthine; uric acid; metabolism


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