The circadian rhythm of cortisol in the saliva of young pigs.

Abstract:

:Single and population-mean cosinor analyses document a circadian rhythm in salivary cortisol of pigs (p < 0.001). The midline estimated statistic of rhythm, the MESOR (M), is 1.50 +/- 0.07 ng/ml. For the group of 14 pigs studied there was a predictable variation of 64% around this mean in salivary cortisol within a day: the double circadian amplitude, 2A, was 0.96 ng/ml, with a 95% confidence interval ranging from 0.60 to 1.32 ng/ml. A measure of timing, the acrophase, phi, was 10 h 52 min from the phase reference (0030, the middle of the daily dark span of the 24-h light-dark cycle in which the pigs were kept). The 95% confidence interval of phi extended from 9 h 48 min to 12 h 12 min from the reference time. The chronobiologic approach provides indispensable quantitive characteristics as reference standards for future basic or applied work.

journal_name

Physiol Behav

journal_title

Physiology & behavior

authors

Ekkel ED,Dieleman SJ,Schouten WG,Portela A,Cornélissen G,Tielen MJ,Halberg F

doi

10.1016/0031-9384(96)00107-2

subject

Has Abstract

pub_date

1996-09-01 00:00:00

pages

985-9

issue

3

eissn

0031-9384

issn

1873-507X

pii

0031-9384(96)00107-2

journal_volume

60

pub_type

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