TABLE 2

Energy expenditure and physical activity level before and during bed rest

Daily livingDuring bed rest
CONFDRaPCONFDRbPcP
Resting energy expenditure (REE) (kJ/day/kg)99 ± 1.096 ± 2.7ns101 ± 1.497 ± 2.4nsns
Activity energy expenditure (AEE) (kJ/day/kg)83 ± 7102 ± 8ns26 ± 427 ± 3P < 0.0001P < 0.0001
Total energy expenditure (TEE) (kJ/day/kg)207 ± 8218 ± 12ns146 ± 5138 ± 4P < 0.0001P < 0.0001
Daily physical activity level (PAL) (TEE/REE)2.1 ± 0.12.3 ± 0.1ns1.5 ± 0.051.4 ± 0.03P < 0.0001P < 0.0001
Sitting (hours/day)7.2 ± 0.66.5 ± 0.9ns
  • 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.