Cardiorespiratory fitness and fat oxidation during exercise in Chinese, Indian, and Malay men with elevated body mass index.

A cross-sectional pilot investigation was performed in Chinese, Indian, and Malay men (15 each) with elevated body mass index to compare ( i ) cardiorespiratory fitness (CRF) and ( ii ) fat oxidation at rest and maximal fat oxidation during exercise. Predicted CRF (Chinese: 37.0 (5.1) mL·kg -1 ·min -1 ; Indian: 34.8 (5.6) mL·kg -1 ·min -1 ; Malay: 33.0 (7.1) mL·kg -1 ·min -1 ; P  = 0.208) and resting fat oxidation were similar among groups. Maximal fat oxidation during exercise was lower in Indian (3.81 (1.02) mg·kg -1 ·min -1 , P  = 0.004) and Malay (3.36 (0.95) mg·kg -1 ·min -1 , P  < 0.001) than Chinese (5.17 (1.23) mg·kg -1 ·min -1 ) men. Fat oxidation during exercise may contribute toward obesity risk in Asian populations. ClinicalTrials.gov Identifier: NCT05337111.