Morita, Ayako, Natsuhara, Kazumi, Vengiau, Gwendalyn, Chen, Cindy Chia-Jung, Odani, Shingo, Inaoka, Tsukasa, Tadokoro, Kiyoshi, Suda, Kazuhiro, Furusawa, Takuro, Siba, Peter, Phuanukoonnon, Suparat, and Umezaki, Masahiro (2016) Reduced morning cortisol concentration in saliva was associated with obesity: evidence from community-dwelling adults in Papua New Guinea. American Journal of Human Biology, 28 (4). pp. 587-590.

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Abstract

Objectives: This study investigated morning salivary cortisol concentration in relation to total body fat composition among community-dwelling Papua New Guinean adults.

Methods: In addition to demographic and anthropometric measurements, saliva was collected in a single morning from 478 residents in Eastern Highlands Province and Madang Province.

Results: After adjusting for age, region, and occupation, the morning salivary cortisol concentration was significantly negatively correlated with body mass index among men (B = -0.01, P < 0.05) and women (B = -0.013, P < 0.05), and waist circumference (B = -0.007, P < 0.05), waist-to-hip-ratio (B = -1.214, P < 0.05), and subscapular-to-triceps skinfold-thickness ratio (B = -0.045, P < 0.05) among men. Men with total or abdominal body fat mass known for elevated risk of non-communicable diseases displayed lower cortisol compared to men without such risk.

Conclusions: Papua New Guinean adults with increased accumulation of body fat showed reduced cortisol concentration in morning saliva.

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