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TABLE 2

Energy expenditure and physical activity level before and during bed rest

Daily living
During bed rest
CONFDRaPCONFDRbPcP
Resting energy expenditure (REE) (kJ/day/kg) 99 ± 1.0 96 ± 2.7 ns 101 ± 1.4 97 ± 2.4 ns ns 
Activity energy expenditure (AEE) (kJ/day/kg) 83 ± 7 102 ± 8 ns 26 ± 4 27 ± 3 P < 0.0001 P < 0.0001 
Total energy expenditure (TEE) (kJ/day/kg) 207 ± 8 218 ± 12 ns 146 ± 5 138 ± 4 P < 0.0001 P < 0.0001 
Daily physical activity level (PAL) (TEE/REE) 2.1 ± 0.1 2.3 ± 0.1 ns 1.5 ± 0.05 1.4 ± 0.03 P < 0.0001 P < 0.0001 
Sitting (hours/day) 7.2 ± 0.6 6.5 ± 0.9 ns — — — — 
Daily living
During bed rest
CONFDRaPCONFDRbPcP
Resting energy expenditure (REE) (kJ/day/kg) 99 ± 1.0 96 ± 2.7 ns 101 ± 1.4 97 ± 2.4 ns ns 
Activity energy expenditure (AEE) (kJ/day/kg) 83 ± 7 102 ± 8 ns 26 ± 4 27 ± 3 P < 0.0001 P < 0.0001 
Total energy expenditure (TEE) (kJ/day/kg) 207 ± 8 218 ± 12 ns 146 ± 5 138 ± 4 P < 0.0001 P < 0.0001 
Daily physical activity level (PAL) (TEE/REE) 2.1 ± 0.1 2.3 ± 0.1 ns 1.5 ± 0.05 1.4 ± 0.03 P < 0.0001 P < 0.0001 
Sitting (hours/day) 7.2 ± 0.6 6.5 ± 0.9 ns — — — — 

Data are mean ± SE.

aP, significant difference between the groups before bed rest.

bP, significant difference before vs. after bed rest within CON.

cP, significant difference before vs. after bed rest within FDR. ns, nonsignificant. REE, AEE, TEE, and PAL based on Actiheart recordings during 4 days of daily living 3 weeks before bed rest. Hours sitting per day based on International Physical Activity Questionnaire.

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