Effect of ambient temperature on cardiovascular drift and maximal oxygen uptake

• Published in: Medicine and science in sports and exercise Vol. 40; no. 6; p. 1065
• Main Authors: Lafrenz, Andrew J, Wingo, Jonathan E, Ganio, Matthew S, Cureton, Kirk J
• Format: Journal Article
• Language: English
• Published: United States 01.06.2008
• Subjects: Adult; Athletic Performance - physiology; Exercise Test; Heart Rate - physiology; Heat Stress Disorders - physiopathology; Humans; Male; Oxygen Consumption - physiology; Stroke Volume - physiology
• ISSN: 0195-9131
• DOI: 10.1249/mss.0b013e3181666ed7

This study tested the hypothesis that the magnitude of cardiovascular (CV) drift and decrease in maximal oxygen uptake (V[spacing dot above]O2max) would be greater at 35 degrees C than at 22 degrees C. The increase in HR and decrease in stroke volume (SV) between 15 and 45 min of cycling at 59.2 +/- 1.9% V[spacing dot above]O2max (CV drift) was measured in hot (HEAT, 35 degrees C) and cool (COOL, 22 degrees C) ambient temperatures in 10 endurance-trained men (age = 23 +/- 3 yr, V[spacing dot above]O2max = 64.7 +/- 8.7 mL.kg.min). V[spacing dot above]O2max 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. CV drift and the associated decrease in V[spacing dot above]O2max was greater (P < 0.05) in HEAT versus COOL. HR increased 11% (P < 0.05), SV decreased 11% (P < 0.05), and V[spacing dot above]O2max 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 V[spacing dot above]O2max (5%, P > 0.05) between 15 and 45 min in COOL. These data demonstrate the magnitude of CV drift during prolonged submaximal exercise, and the accompanying decrease in V[spacing dot above]O2max measured immediately thereafter is greater in a hot than in a cool environment.