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Aim: The objective of this current research was to compare fat oxidation rates during an incremental cycling exercise test in a temperate vs. hot environment.

Methods: Twelve healthy young participants were recruited for a randomised crossover experimental design. Each participant performed a VO_2max test in a thermoneutral environment followed by two cycling ramp test trials, one in a temperate environment (18.3°C) and another in a hot environment (36.3°C). The ramp test consisted of 3-min stages of increasing intensity (+10% of VO_2max) while gas exchange, heart rate and perceived exertion were measured.

Results: During exercise, there was a main effect of the environment temperature on fat oxidation rate (F = 9.35, P = 0.014). The rate of fat oxidation was lower in the heat at 30% VO_2max (0.42 ± 0.15 vs.0.37 ± 0.13 g/min; P = 0.042), 60% VO_2max (0.37 ± 0.27 vs.0.23 ± 0.23 g/min; P …