The goal of this clinical trial is to test whether changes in lactate kinetics during exercise (due to glycogen depletion or hyperthermia) alter the pattern of fat oxidation during a maximal incremental cycle ergometer test in healthy young active people. The main questions it aims to answer are: * Will a rightward shift in lactate kinetics, induced by a previous glycogen depletion, produce a rightward shift in fat oxidation? * Will a leftward shift in lactate kinetics due to an increase in ambient temperature produce a leftward shift in fat oxidation? Participants will perform three maximal incremental tests in three different conditions: * one in the control condition; * one with glycogen depletion; * and one with ambient heat (the latter two in randomized, counterbalanced order).
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Blood lactate concentration
Timeframe: Through study completion, an average of 5 months
Fat oxidation
Timeframe: Through study completion, an average of 5 months