TABLE 1

Characteristics of the participants in the ambulatory period and body mass and composition and dietary intake evolution during bed rest

Ambulatory period
30 days of bed rest
60 days of bed rest
MANOVA (P value)
ControlExerciseControlExerciseControlExerciseBed rest effectGroup effectBed rest–by–group interaction
Characteristics
    n888888
    Age (years)34 ± 433 ± 4
    Height (m)1.63 ± 0.061.65 ± 0.07
    BMI (kg/m2)21.3 ± 1.421.7 ± 1.4
    Vo2peak (l/min)1.9 ± 0.42.1 ± 0.4
        Vo2peak (ml · kg−1 · min−1)34.5 ± 7.735.1 ± 4.4
Body mass and composition
    Body mass (kg)55.6 ± 3.858.4 ± 6.552.9 ± 4.155.8 ± 6.052.3 ± 3.854.9 ± 6.10.0001NSNS
    FFM (kg)40.8 ± 3.143.8 ± 5.838.3 ± 3.242.7 ± 5.538.0 ± 3.042.5 ± 5.70.0001NS0.0006
    FM (kg)14.8 ± 3.714.5 ± 3.214.7 ± 3.813.1 ± 3.514.3 ± 3.512.4 ± 3.60.001NS0.005
        FM (%)26.4 ± 5.525.0 ± 5.027.5 ± 5.823.5 ± 5.827.1 ± 5.522.6 ± 6.20.06NS0.006
Dietary intake
    Energy intake (MJ/day)7.5 ± 0.27.6 ± 0.56.5 ± 0.27.4 ± 0.86.5 ± 0.27.4 ± 0.80.00010.0390.004
    Carbohydrates (g/day)259 ± 7261 ± 16219 ± 9252 ± 27219 ± 9252 ± 270.00010.0300.002
        %58 ± 158 ± 156 ± 157 ± 156 ± 157 ± 10.0001NS0.002
    Lipids (g/day)59 ± 259 ± 452 ± 259 ± 652 ± 259 ± 60.0010.0270.0018
        %29 ± 030 ± 030 ± 030 ± 030 ± 030 ± 00.0001NSNS
    Proteins (g/day)56 ± 459 ± 654 ± 456 ± 654 ± 456 ± 60.01NSNS
        %13 ± 112 ± 114 ± 113 ± 114 ± 113 ± 10.0002NS0.0001
  • Data are means ± SD. No differences were noted between groups (t test) in the ambulatory period. The effect of bed rest was determined by multiple MANOVA. The between-group differences in the energy intake corresponds to the estimated cost of the exercise training protocol. Vo2peak, peak O2 consumption.