Acute Exercise With Overdressing

The purpose of the present study is to examine the influence of a novel 90-minute exercise + overdressing protocol on thermal responses in comparison to matched exercise in standard PT clothing. Sixteen healthy and fit adults (8 men and 8 women) will complete two 90-minute exercise sessions (randomized order) in a temperate environment (\~20°C, \~50% relative humidity, and \~1 mph air velocity) involving a 30-minute run immediately followed by a 60-minute walk. Participants will wear standard physical training (PT) clothing (shorts, t-shirt) during one session and an overdressing ensemble in the other. The investigators hypothesize that 1) exercise + overdressing will elevate core temperature to between 38.3°C and 39.3°C for at least 45 minutes; and 2) elevations in core temperature, skin temperature, heart rate, and sweat rate will be substantially larger than observed with 90 minutes of matched exercise in standard PT clothing.