Alterations of Cardiac Output, Stroke Volume, and Heart Rate during 3 Hours of Exercise in Different Ambient Temperatures

n=8 normal young men

3 hours of treadmill walking in 40°C ambient temperature

3 hours of treadmill walking in lower ambient temperatures (20, 25, 30, and 35°C)

Alterations in cardiac output, heart rate, oxygen uptake, rectal temperature, and mean skin temperature measured at 10th minute, 1st hour, 2nd hour, and 3rd hour of exercisesurrogate