Purpose: This study tested the hypothesis that the magnitude of cardiovascular (CV) drift and decrease in maximal oxygen uptake (VO2max) would be greater at 35°C than at 22°C. Methods: The increase in HR and decrease in stroke volume (SV) between 15 and 45 min of cycling at 59.2 +/- 1.9% VO2max (CV drift) was measured in hot (HEAT, 35°C) and cool (COOL, 22°C) ambient temperatures in 10 endurance-trained men (age = 23 +/- 3 yr, VO2max = 64.7 +/- 8.7 mL/kgmin). VO2max was measured immediately after the 45 min of cycling and again under both ambient temperature conditions on separate days after 15 min of cycling. This design permitted assessment of V[spacing dot above]O2max between the same time points that CV drift occurred. Fluid to replace sweat losses was provided during all trials. Results: CV drift and the associated decrease in VO2max was greater (P < 0.05) in HEAT versus COOL. HR increased 11% (P < 0.05), SV decreased 11% (P < 0.05), and VO2max fell 15% (P < 0.05) between 15 and 45 min in HEAT, whereas HR and SV changed less (+2% and -2% for HR and SV, respectively, P < 0.05), and there was no significant decrease in VO2max (5%, P > 0.05) between 15 and 45 min in COOL. Conclusion: These data demonstrate the magnitude of CV drift during prolonged submaximal exercise, and the accompanying decrease in VO2max measured immediately thereafter is greater in a hot than in a cool environment.
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