Advisor Information
Dustin Slivka
Presentation Type
Poster
Start Date
26-3-2021 12:00 AM
End Date
26-3-2021 12:00 AM
Abstract
The effects of exercise training in the heat are well documented in men. However, the effects of exercise training in the heat in women have not received as much attention. We have previously reported a blunted rise in PGC1α in men after acute aerobic exercise in the heat. Purpose: To determine the impact of three weeks of aerobic exercise training in the heat compared to training in room temperature on thermoregulation, PGC1α mRNA response, and aerobic capacity in women. Methods: Twenty-three untrained college aged females (24±4 yoa, 168±5 cm, and 67.3±11.2 kg) were randomly assigned to 3 weeks of aerobic exercise training in either 20°C (n=12) or 33°C (n=11). Results: VO2max in room temperature conditions increased with training (2.57±0.35 to 2.71±0.32 L·min-1, p=0.01), but independent of temperature condition (p=0.821). HR decreased with training (152±16 to 140±0.13 bpm, p<0.001), but was independent of temperature condition (p=0.341). Sweat rate increased with training (0.655±0.192 to 0.775±0.212 L·hr-1, p=0.006) and was higher in 33°C (0.835±0.144 L·hr-1) than 20°C (0.605±0.132 L·hr-1, p<0.001). PGC1α mRNA increased with an acute exercise bout before (1.01±0.10 to 4.96±2.08 fold, p<0.001) and after training (1.07±0.10 to 3.21±1.39 fold, p<0.001) and had a smaller response after training than before training (p=0.005), but there were no differences between temperature groups (p=0.661). Conclusions: Women can increase aerobic fitness and maintain their exercise induced PGC1α mRNA response in the heat equally to that of room temperature conditions. This response contrasts with the blunted PGC1α mRNA response and VO2 max alterations previously observed in men.
The Effects of 3-Weeks of Aerobic Exercise in Heat on Fitness and PGC1a in Females
The effects of exercise training in the heat are well documented in men. However, the effects of exercise training in the heat in women have not received as much attention. We have previously reported a blunted rise in PGC1α in men after acute aerobic exercise in the heat. Purpose: To determine the impact of three weeks of aerobic exercise training in the heat compared to training in room temperature on thermoregulation, PGC1α mRNA response, and aerobic capacity in women. Methods: Twenty-three untrained college aged females (24±4 yoa, 168±5 cm, and 67.3±11.2 kg) were randomly assigned to 3 weeks of aerobic exercise training in either 20°C (n=12) or 33°C (n=11). Results: VO2max in room temperature conditions increased with training (2.57±0.35 to 2.71±0.32 L·min-1, p=0.01), but independent of temperature condition (p=0.821). HR decreased with training (152±16 to 140±0.13 bpm, p<0.001), but was independent of temperature condition (p=0.341). Sweat rate increased with training (0.655±0.192 to 0.775±0.212 L·hr-1, p=0.006) and was higher in 33°C (0.835±0.144 L·hr-1) than 20°C (0.605±0.132 L·hr-1, p<0.001). PGC1α mRNA increased with an acute exercise bout before (1.01±0.10 to 4.96±2.08 fold, p<0.001) and after training (1.07±0.10 to 3.21±1.39 fold, p<0.001) and had a smaller response after training than before training (p=0.005), but there were no differences between temperature groups (p=0.661). Conclusions: Women can increase aerobic fitness and maintain their exercise induced PGC1α mRNA response in the heat equally to that of room temperature conditions. This response contrasts with the blunted PGC1α mRNA response and VO2 max alterations previously observed in men.