Table 2 Effect of head-down tilt bed rest (HDBR) on 24-h rectal temperature rhythm.

From: Regular exercise counteracts circadian shifts in core body temperature during long-duration bed rest

Parameter

Group

HDBR7

HDBR49

Mesor (°C)

CTR

36.86 ± 0.05

36.83 ± 0.06

RE

36.78 ± 0.03

36.75 ± 0.02

RVE

36.95 ± 0.05

36.87 ± 0.03

Amplitude (°C)

CTR

0.48 ± 0.04

0.49 ± 0.03

RE

0.44 ± 0.07

0.46 ± 0.04

RVE

0.46 ± 0.04

0.44 ± 0.04

Acrophase (h)

CTR

16.95 ± 0.53

17.65 ± 0.49

RE

17.05 ± 0.32

16.60 ± 0.55

RVE

17.52 ± 0.26

17.07 ± 0.43

  1. Data are means and standard errors. Circadian parameters were determined by cosinor analysis using 24-h core body temperature recordings. Data were collected on day 7 (HDBR7) and day 49 (HDBR49) of HDBR. CTR performed HDBR only (n = 5). RE performed HDBR plus three times per week high-load resistive exercise (n = 5). RVE performed HDBR and the same exercise as the RE group, but with additional superimposed whole-body vibrations (n = 6).
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