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Title

THE SIMULTANEOUS EFFECTS OF DEPRIVED SLEEP AND COFFEE CAFFEINE INTAKE ON PLASMA CORTISOL LEVELS AMONG IRANIAN HEALTHY ADULT MEN: A RANDOMIZED CONTROLLED CROSSOVER TRIAL

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 Start Page 220 | End Page 220

Abstract

 Background: SLEEP DEPRIVATION and caffeinated COFFEE on its own have been reported to adversely affect the PLASMA CORTISOL levels. This study aimed to determine the effects of COFFEE CAFFEINE consumption on PLASMA CORTISOL level when simultaneously coupled with deprived sleep.Methods: The study conducted in two phases. In the screening phase forty-two moderate COFFEE consumers (≤ 3 cups/day), healthy male good sleepers a Pittsburgh Sleep Quality Index (PSQI) ≤5 aged 20-40 y were recruited using PSQI questionnaires, interview, anthropometric measurements, and 24-h recalls. After one night adaptation in research unit, subjects were randomly assigned in three groups to participate in the experimental phase which was a randomized controlled crossover trial including three treatments in two-week washout periods.Each treatment comprised of three nights of deprived sleep (4 hrs. in bed) plus three 150 cc/cup of boiled water (treatment 1), decaffeinated COFFEE (treatment 2, 99.99% CAFFEINE-free) and/or caffeinated COFFEE (treatment 3, 65 mg CAFFEINE/cup). The levels of PLASMA CORTISOL were measured at baseline and end of the treatments using electrochemiluminescence method.Results: The analysis of variances showed no statistical differences between PLASMA CORTISOL concentrations of deprived sleep subjects who received one of the treatments.Pairwise comparison test indicated that when coupled with SLEEP DEPRIVATION, caffeinated COFFEE led to no significant changes in PLASMA CORTISOL levels as compared to decaffeinated COFFEE. Discussion: Given the individually effects of COFFEE CAFFEINE consumption on circulating cortisol levels, some probable interactions following simultaneous administrating of SLEEP DEPRIVATION and caffeinated COFFEE appeared to attenuate COFFEE CAFFEINE-induced impacts on increased PLASMA CORTISOL.Conclusion: Findings of this study showed that caffeinated/ decaffeinated COFFEE in healthy habitual COFFEE consumers manipulates cortisol levels within a range, which is safe for individuals who normally have short sleep durations.

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