Substrate Utilization, Exercise Performance, and Skeletal Muscle Response to Energy Deficit and Altitude Acclimatization

Volunteers will receive dietary protein at 1.0 ± 0.2 g/kg/d.

Volunteers will receive dietary protein at 2.0 ± 0.2 g/kg/d.

During aerobic performance testing, volunteers will receive a beverage containing 80 g glucose + 65 g fructose consumed at a rate providing \~1.8 g carbohydrate/min.

During aerobic performance testing, volunteers will receive a volume and flavor-matched, non-nutritive placebo beverage.