Table 1 Comparison of rectal temperature (RT) profile (N = 19) and 24-h urinary excretion variables (N = 16) between light condition groups.

From: Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure

Variable

Condition

Mean ± SEM

t

p

RT nadir time, h

On the day 1

Dim

5:31 ± 0.54

0.39

0.701

Bright

5:22 ± 0.51

RT amplitude, °C

On the day 1

Dim

0.38 ± 0.01

0.35

0.729

Bright

0.37 ± 0.01

RT nadir time, h

On the day 3

Dim

5:37 ± 0.30

2.63

0.017

Bright

4:52 ± 0.28

RT amplitude, °C

On the day 3

Dim

0.37 ± 0.03

2.43

0.026

Bright

0.45 ± 0.04

Urine volume, ml/day

Dim

1657 ± 75.3

0.81

0.433

Bright

1711 ± 72.8

Na, mEq/day

Dim

146 ± 5.3

1.14

0.272

Bright

155 ± 6.3

K, mEq/day

Dim

24.8 ± 2.0

0.77

0.454

Bright

23.3 ± 1.2

Cl, mEq/day

Dim

125 ± 4.5

0.78

0.446

Bright

131 ± 5.4

Ca, mg/day

Dim

172 ± 13.9

0.04

0.965

Bright

172 ± 14.3

P, mg/day

Dim

690 ± 33.7

0.61

0.548

Bright

680 ± 26.2

Mg, mg/day

Dim

82.8 ± 4.3

0.21

0.837

Bright

83.2 ± 4.6

UA, mg/day

Dim

440 ± 12.2

1.21

0.247

Bright

453 ± 16.5

  1. Ca calcium, Cl chloride, K potassium, Mg magnesium, Na sodium, P phosphorus, RT rectal temperature, UA uric acid. Statistical values are from paired t-tests.
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