Core Temperature and Maximal Oxygen Uptake During Exercise in the Heat

Core Temperature and Maximal Oxygen Uptake During Exercise in the Heat

Implications for Exercise Prescription

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This work measured maximal oxygen uptake (VO2max) andcore temperature (TC) at exhaustion, and oxygenuptake and heart rate during submaximal exercise in22 runners under 7 conditions. The conditions were:1) 25 degrees C (dC), no preheating; 2-4 and 6) 25,35, 40, and 45 dC, with preheating by a 20-min walk;5) 45 dC, no preheating; and 7) 45 dC, with passivepreheating raising TC to the same degree as at theend of the 20-min walk in Condition 6. Compared tothe Condition 1, VO2max was reduced 3-9% underConditions 2-5 when TC at VO2max was below theapparent critical TC, but was reduced 17-19% underCo...