Is there an association between daylight hours and serum testosterone levels in men?

Livingston, Mark; Heald, Adrian; Hackett, Geoffrey; Ramachandran, Harishnath; Ramachandran, Sudarshan

Abstract

Background
Studies assessing variability of serum testosterone levels associated with seasonal environmental factors have been contradictory.

Design
We assessed associations between the seasons and changes (δ) in seasonality indices and male serum total testosterone (δTT) variability.

Patients and Measurements
Data were collected in 144 men with paired serum TT samples (126 non-fasting/18 fasting) analysed at Walsall Manor Hospital, UK (52.3 degrees North). Seasonal factors (ambient temperature within 15 min of sampling, humidity, precipitation, duration of daylight on the day of sampling, monthly average ambient temperature, and precipitation) were obtained from local weather-station archives. Sign-rank test determined inter-sample differences between TT and seasonality indices. Linear regression analyses studied associations between δTT and δ seasonal indices in the total cohort and subgroups (stratified by medians of age, TT and men with paired non-fasting samples). Sign-rank determined whether serum TT differed between the seasons.

Results
Median inter-sample interval was 63 days. No significant inter-sample differences were evident regarding serum TT levels and seasonality indices. No associations were noted between δTT and δ seasonality indices in the total cohort and subgroups stratified by age and TT. Interestingly, δ ambient temperature (p = 0.012) and daylight duration (p = 0.032) were inversely associated with δTT in the 126 men in the non-fasting group (dependent variable). Only a small degree of the variability in the δTT was accounted by the above-mentioned independent variables. The seasons did not appear to influence serum TT values.

Conclusions
No relation was shown between seasonality and serum TT in the total cohort, thus possibly eliminating a confounding variable that could affect laboratory and clinical practice. It may be that seasonal variation in length of day is too modest at this latitude to demonstrate significant associations, hence our findings are latitude specific. We suggest that further data analysis to address this question in areas with greater seasonal variation would be appropriate.

Citation

Livingston, M., Heald, A., Hackett, G., Ramachandran, H., & Ramachandran, S. (2024). Is there an association between daylight hours and serum testosterone levels in men?. The aging male : the official journal of the International Society for the Study of the Aging Male, 27(1), https://doi.org/10.1080/13685538.2024.2409189

• Journal Article Type: Article
• Acceptance Date: Sep 22, 2024
• Online Publication Date: Oct 13, 2024
• Publication Date: Dec 31, 2024
• Deposit Date: Oct 25, 2024
• Journal: The Aging Male
• Print ISSN: 1368-5538
• Electronic ISSN: 1473-0790
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• Volume: 27
• Issue: 1
• DOI: https://doi.org/10.1080/13685538.2024.2409189
• Public URL: https://keele-repository.worktribe.com/output/955312
• Additional Information: Peer Review Statement: The publishing and review policy for this title is described in its Aims & Scope.; Aim & Scope: http://www.tandfonline.com/action/journalInformation?show=aimsScope&journalCode=itam20; Received: 2024-07-18; Revised: 2024-09-16; Accepted: 2024-09-22; Published: 2024-10-13