Does lunar cycle affect biological parameters in young healthy men
2021
This study aimed to assess the effects of the lunar cycle on diurnal variation of biological, i.e, hormonal, biochemical, and hematological, profiles of diurnally active healthy men. Blood samples of 20 males were collected on four occasions [full moon (FM) and new moon (NM), in the morning (06:00-07:00 h) and evening (19:00-20:00 h)]. The results showed that melatonin and testosterone levels and neutrophils count were lower during the FM as compared to the NM in the morning (p < .001; d = 4.13, p < .001; d = 3.84, p < .01; d = 0.77, respectively) and evening (p < .001; d = 6.36, p < .001; d = 4.03, p < .05; d = 1.07, respectively) samples. However, cortisol level was higher during the FM compared to the NM, in the morning (p < .001; d = 0.74) and evening (p < .001; d = 3.54). Hemoglobinemia was higher only in the evening during the FM compared to the evening of the NM (p < .01; d = 1.22). In summary, this study confirmed that lunar cycle can affect human biological parameters independently of time of day.
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