Table 2.

Energy expenditure and fat and carbohydrate oxidations during rest, exercise, and recovery in formerly obese subjects and matched controls

Time (min)
0 15 3045 60 75
Energy expenditure, kJ/min
 FO3.77 ± 1.01* 22.31 ± 4.8622.03 ± 5.12 23.16 ± 6.3223.00 ± 6.34 4.17 ± 0.94
 C4.88 ± 0.74 24.36 ± 2.4724.28 ± 1.81 24.20 ± 2.6524.60 ± 1.28 4.34 ± 1.05
Carbohydrate oxidation, kJ/min
 FO 1.87 ± 1.04* 12.21 ± 4.83 10.54 ± 4.089.96 ± 4.38 10.35 ± 3.961.60 ± 1.43
 C 0.34 ± 0.2512.17 ± 1.05 10.65 ± 2.3910.45 ± 3.31 10.90 ± 3.600.67 ± 0.58
Carbohydrate oxidation, E-%
 FO49.1 ± 22.5* 52.9 ± 12.7 46.6 ± 9.441.4 ± 8.7 44.6 ± 9.3 37.2 ± 30.7
 C 6.8 ± 4.8 50.3 ± 5.544.3 ± 12.1 43.9 ± 16.5 44.5 ± 15.314.9 ± 10.0
Fat oxidation, kJ/min
 FO1.32 ± 0.84* 9.55 ± 2.2510.94 ± 2.24 12.65 ± 2.5412.09 ± 3.67 2.06 ± 1.37
 C3.70 ± 0.57 11.48 ± 2.1912.92 ± 3.43 13.04 ± 4.5812.97 ± 3.87 3.01 ± 0.81
Fat oxidation, E-%
 FO 33.8 ± 22.5* 44.5 ± 12.450.8 ± 9.19 56.1 ± 8.4 52.9 ± 9.3850.5 ± 30.4
 C 78.0 ± 4.846.8 ± 5.7 52.8 ± 12.2 53.2 ± 16.852.7 ± 15.5 70.0 ± 9.89
  • Data are means ± SD. FO, formerly obese subjects; C, controls; E-%, energy-% (proportion of energy expenditure covered by carbohydrate or fat, in percentage).

  • * Significant difference between FO and C (P < 0.05).