It is not clear if fat oxidation is attenuated at higher exercise intensities, when exercising with a small muscle mass, and therefore, we studied leg fat oxidation during graded one-leg exercise. Ten males (age: 27 ± 2 years, body mass: 82 ± 3 kg, BMI: 24 ± 1 kg m, V̇O: 49 ± 2 mL min kg) performed one-leg exercise at 25% of maximal workload (W) for 30 min, followed by 120-min exercise at 55% W with the contralateral leg, and finally 30-min exercise at 85% W with the first leg. Blood was sampled from an artery and both femoral veins, and blood flow was determined using Doppler ultrasound.
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