Lack of evidence for meteorological effects on infradian dynamics of testosterone
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Climatic factors are known to influence the endocrine system. Previous studies have shown that circannual seasonal variations of testosterone might be partly explained by changes in air temperature. Whether infradian variations are affected by meteorological factors is unknown. To analyze possible effects of meteorological parameters on infradian variations of salivary testosterone levels in both sexes, daily salivary testosterone levels were measured during 1 month in 14 men and 17 women. A correlation analysis between hormonal levels and selected meteorological parameters was performed. The results indicate that high testosterone levels are loosely associated with cold, sunny and dry weather in both sexes. However, only the correlations between testosterone and air temperature (men) and actual cloudiness (women) were statistically significant (p < 0,05). Although some correlations reached the level of statistical significance, the effects of selected meteorological parameters on salivary testosterone levels remain unclear. Further longer-term studies concentrating on air temperature, cloudiness and average relative humidity in relation to the sex hormone axis are needed.
KeywordsSalivary testosterone Weather Effective temperature Humidity Cloudiness
The authors are grateful to the Slovak Hydrometeorological Institute for providing the data on meteorological parameters and especially to the volunteers for their patience and endurance. This study was supported by grants from the Scientific Grant Agency of Ministry of Education in Slovak Republic VEGA 1/3420/06, VEGA 1/3438/06, AV 4/0038/07, VEGA 1/0305/09, and the Ministry of Health of the Slovak republic 2006/22-UK-01.
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