Table 1.

Effects of 60 days HDT bed rest on measures of anthropometry and cardiorespiratory capacity.

Measurement	CTRL (n = 11)		JUMP (n = 12)		Statistics
	Pre	Post	Pre	Post	Time	Int	T*Int
Age (years)	28 ± 6		30 ± 7
Height (cm)	181 ± 5		181 ± 7
BMI (kg/m2)	23.33 ± 2.03	22.22 ± 1.67*	23.75 ± 1.80	23.07 ± 1.81*	<0.001	0.410	0.021
BW (kg)	76.10 ± 8.06	72.47 ± 6.76*	77.85 ± 6.55	75.63 ± 6.39*	<0.001	0.405	0.027
LM (kg)	56.94 ± 6.57	53.03 ± 5.11*	56.41 ± 5.18	55.08 ± 4.29*	<0.001	0.731	0.002
FM (kg)	16.91 ± 3.95	17.00 ± 3.41	19.21 ± 6.42	18.34 ± 6.18*	0.055	0.412	0.018
BMC (kg)	3.14 ± 0.36	3.14 ± 0.37	3.00 ± 0.32	3.00 ± 0.32	0.605	0.355	0.800
Measurement	CTRL (n = 10)		JUMP (n = 10)		Statistics
	Pre	Post	Pre	Post	Time	Int	T*Int
$\stackrel{.}{\text{V}}\text{O}{}_{2\text{p}\text{e}\text{a}\text{k}}$ (L/min)	3.85 ± 0.68	2.57 ± 0.48*	3.32 ± 0.76	2.99 ± 0.53*	<0.001	0.848	0.001
$\stackrel{.}{\text{V}}\text{O}{}_{2\text{p}\text{e}\text{a}\text{k}}$ (ml/kgLM/min)	67.55 ± 8.42	48.74 ± 9.35*	58.72 ± 10.95	54.14 ± 8.03	<0.001	0.660	<0.001

Data are presented as mean ± standard deviation (SD). Significant p < 0.05 are indicated in bold. Anthropometric measurements were taken on BDC-3 and HDT60. $\stackrel{.}{\text{V}}\text{O}{}_{2\text{p}\text{e}\text{a}\text{k}}$ was measured on BDC-8 and R + 1. When a significant interaction effect was found, an asterisk (^*) denotes a significant difference from pre in each intervention group. CTRL, control group; JUMP, jumping countermeasure group; Time, main effect of time; Int, main effect of intervention; T^*Int, time^*intervention interaction effect; BMI, body mass index; BW, body weight; LM, lean mass; FM, fat mass; BMC, bone mineral content; $\stackrel{.}{\text{V}}\text{O}{}_{2\text{p}\text{e}\text{a}\text{k}}$, peak aerobic capacity.