Table 2.
Seasonal changes in body composition.
| Winter | Spring | Summer | |
|---|---|---|---|
| Hours of sleep (min) | 443 ± 49 | 428 ± 29 | 427 ± 61 |
| Stature (cm) | 159.9 ± 3.9 | ||
| Body Weight (kg) | 54.0 ± 6.2 | 54.0 ± 5.9 c | 53.4 ± 6.1 c |
| Fat mass (kg) | 15.6 ± 4.5 b | 15.3 ± 4.4 | 14.9 ± 4.0 b |
| Fat mass (%) | 28.3 ± 5.5 b | 27.9 ± 5.5 | 27.4 ± 4.9 b |
| Lean Body Mass (kg) | 38.5 ± 3.0 | 38.8 ± 3.0 | 38.5 ± 3.4 |
| Skeletal muscle mass (kg) | 20.9 ± 1.8 | 21.0 ± 1.9 | 20.9 ± 2.0 |
| BMI (kg/m2) | 21.1 ± 2.1 | 21.1 ± 2.0 c | 20.9 ± 2.0 c |
| R Arm Fat mass (kg) | 1.04 ± 0.36 | 1.01 ± 0.35 | 0.99 ± 0.30 |
| L Arm Fat mass (kg) | 1.07 ± 0.36 b | 1.04 ± 0.34 | 1.01 ± 0.30 b |
| Trunks Fat mass (kg) | 7.29 ± 2.44 b | 7.08 ± 2.33 c | 6.79 ± 2.18 b, c |
| R Leg Fat mass (kg) | 2.60 ± 0.67 | 2.59 ± 0.66 | 2.55 ± 0.58 |
| L Leg Fat mass (kg) | 2.58 ± 0.69 | 2.58 ± 0.66 | 2.54 ± 0.58 |
| R Arm Muscle mass (kg) | 1.72 ± 0.22 b | 1.72 ± 0.21 | 1.69 ± 0.24 b |
| L Arm Muscle mass (kg) | 1.68 ± 0.21 b | 1.67 ± 0.21 | 1.65 ± 0.24 b |
| Trunks Muscle mass (kg) | 16.65 ± 1.41 b | 16.60 ± 1.34 | 16.41 ± 1.55 b |
| R Leg Muscle mass (kg) | 6.05 ± 0.64 a, b | 6.16 ± 0.68 a | 6.19 ± 0.67 b |
| L Leg Muscle mass (kg) | 6.03 ± 0.65 a, b | 6.14 ± 0.67 a | 6.18 ± 0.69 b |
| Means ± S.D. (n = 28) | |||
R, Right; L, Left; Lean Body Mass(LBM) is the same as Fat-Free Mass(FFM); Bonferroni, a, b, c Means with a common superscript letter are significantly different, p < 0.05.