Cited by 171Circadian rhythm and melatoninHormonal and reproductive studiesHypothalamic control of reproductive hormones

Effects of Acutely Displaced Sleep on Testosterone

Axelsson, John, Ingre, Michael, Åkerstedt, Torbjörn, Holmbäck, Ulf·2005·The Journal of Clinical Endocrinology & Metabolism

Abstract

CONTEXT: It is not yet clear whether the diurnal variation in testosterone is regulated by circadian or homeostatic (sleep) influences. OBJECTIVE: The present study tested whether testosterone is driven by a circadian-independent sleep effect by shifting sleep acutely to daytime in a 24-h sampling regiment. DESIGN, SETTING, AND PARTICIPANTS: In the sleep laboratory, seven healthy young men (age, 22-32 yr) participated in three conditions: habituation (sleep between 2300-0700 h), night sleep (2300-0700 h), and day sleep (0700-1500 h), the latter two in a balanced order. INTERVENTION AND MAIN OUTCOME MEASURE: Serum testosterone was, in all conditions, sampled by hourly blood drawing for 24 h during constant bed rest. RESULTS: Mean testosterone levels increased as a log-linear function of time (hours) across both sleep periods (b = 4.88; P < 0.001), from 15.3 +/- 2.1 to 25.3 +/- 2.2 nmol/liter during night sleep and from 17.3 +/- 2.1 to 26.4 +/- 2.9 nmol/liter during day sleep. Similarly, mean testosterone levels decreased with time (log-linear) awake (b = -1.80; P < 0.001). There was also evidence of a weak circadian component (acrophase ranging between 0651-0924 h) and an increase with time in the laboratory. Moreover, all these effects, except for the increase during sleep, differed significantly between individuals. CONCLUSION: In conclusion, testosterone increased during sleep and fell during waking, whereas circadian effects seemed marginal. Individual differences were pronounced.

Integrity signals

Registry

Crossref · 10.1210/jc.2005-0520

Cites

40 of 40 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

1 of the 41 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Axelsson, J., Ingre, M., Åkerstedt, T., & Holmbäck, U.
Affiliations
  • Karolinska Institutet (SE)
  • Uppsala University (SE)
Corresponding author
Axelsson, John
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2005-08
Volume
90
Issue
8
Pages
4530-4535
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2089025220
Cited by
171
References
41
Citations by year
2026: 1 · 2025: 7 · 2024: 6 · 2023: 4 · 2022: 7 · 2021: 10 · 2020: 5 · 2019: 9 · 2018: 8 · 2017: 9 · 2016: 15 · 2015: 12 · 2014: 8 · 2013: 10 · 2012: 13
FWCI
2.17
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
testosterone, sleep, circadian rhythm, diurnal variation, sleep timing, nocturnal sleep, homeostatic regulation, individual differences
MeSH terms
Adult, Circadian Rhythm, Humans, Male, Regression Analysis, Sleep, Testosterone, Wakefulness

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review