Table 3.
Changes in body composition and resting metabolic rate according to weight changes.
| Baseline | Follow Up | p | |
|---|---|---|---|
| Mean ± SD or Median, 25th–75th | Mean ± SD or Median, 25th–75th | ||
| Subjects with weight loss (n = 37) | |||
| BMI (kg/m2) | 27.4 ± 5.4 | 26.1 ± 5.2 | <0.0001 |
| Total body fat (%) | 29.38 ± 9.04 | 29.37 ± 6.01 | 0.9 |
| Waist circumference (cm) | 101.0, 95.5–118.5 | 106.0, 97.0–119.0 | 0.8 |
| Hips circumference (cm) | 103.0, 98.0–113.0 | 102.0, 97.5–109.0 | 0.06 |
| PhA (o) | 5.15 ± 0.75 | 4.85 ± 0.73 | <0.0001 |
| Resting metabolic rate (Kcal) | 1862 ± 419 | 1797 ± 375 | 0.2 |
| VO2 (mL/min) | 265.5 ± 62.9 | 255.9± 54.8 | 0.2 |
| Ventilation rate (L/min) | 9.79 ± 2.14 | 9.81 ± 2.31 | 0.9 |
| Respiratory frequency (breaths/min) | 18.81 ± 5.64 | 19.91 ± 4.61 | 0.1 |
| Fraction of exhaled oxygen (%) | 17.74 ± 0.50 | 17.7 ± 0.57 | 0.4 |
| Subjects with stable weight (n = 27) | |||
| BMI (kg/m2) | 27.5 ± 5.5 | 27.1 ± 5.5 | 1.0 |
| Total body fat (%) | 26.62 ± 8.32 | 26.7 ± 8.85 | 0.6 |
| Waist circumference (cm) | 110.0, 96.0–122.0 | 107.0, 94.0–122.0 | 0.3 |
| Hips circumference (cm) | 106.0, 98.0–113.0 | 105.0, 93.0–110.0 | 0.3 |
| PhA (o) | 5.16 ± 0.90 | 4.93 ± 0.89 | <0.0001 |
| Resting metabolic rate (Kcal) | 1767 ± 385 | 1650 ± 351 | 0.05 |
| VO2 (mL/min) | 254.2 ± 55.2 | 234.8 ± 50.8 | 0.04 |
| Ventilation rate (L/min) | 9.6 ± 2.0 | 8.9 ± 2.2 | 0.03 |
| Respiratory frequency (breaths/min) | 19.0 ± 3.8 | 18.9 ± 3.7 | 0.8 |
| Fraction of exhaled oxygen (%) | 17.8 ± 0.46 | 17.8 ± 0.60 | 0.8 |
| Subjects with weight gain (n = 18) | |||
| BMI (kg/m2) | 25.7, 24.1–27.2 | 25.3, 26.9–29.2 | <0.0001 |
| Total body fat (%) | 26.68 ± 4.92 | 29.61 ± 7.41 | 0.08 |
| Waist circumference (cm) | 107.0, 100.0–115.7 | 108.0, 101.0–114.5 | 0.2 |
| Hips circumference (cm) | 101.5, 98.2–110.2 | 105.5, 101.2–110.0 | 0.3 |
| PhA (o) | 5.30 ± 0.86 | 4.96 ± 0.85 | 0.03 |
| Resting metabolic rate (Kcal) | 2035 ± 415 | 1771 ± 365 | 0.03 |
| VO2 (mL/min) | 292.2 ± 59.80 | 253.2 ± 53.0 | 0.02 |
| Ventilation rate (L/min) | 10.8 ± 1.91 | 9.2 ± 2.1 | 0.04 |
| Respiratory frequency (breaths/min) | 20.8 ± 3.9 | 19.4 ± 3.08 | 0.1 |
| Fraction of exhaled oxygen (%) | 17.7 ± 0.26 | 17.6 ± 0.39 | 0.4 |
Changes between baseline and follow-up values were tested with the paired t test (for normal variables) of the Wilcoxon non-parametric test (for non-normal variables). Data are presented as mean ± standard deviation or median, lower-upper quartile (25th–75th). BMI: Body mass index; PhA: phase angle; VO2: oxygen consumption.