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  • Title: Associations of work stress with hair cortisol concentrations - initial findings from a prospective study.
    Author: Herr RM, Almer C, Loerbroks A, Barrech A, Elfantel I, Siegrist J, Gündel H, Angerer P, Li J.
    Journal: Psychoneuroendocrinology; 2018 Mar; 89():134-137. PubMed ID: 29414027.
    Abstract:
    There is ample evidence supporting the link between stress at the workplace and physical and mental health. One of the pathways potentially mediating those associations may involve the hypothalamic-pituitary-adrenal (HPA) axis, with cortisol as an end product. While theoretically plausible, findings on the association of self-reported work stress with hair cortisol concentrations (HCC) are inconclusive, being potentially biased by omitted pertinent factors. This issue can be addressed, among others, by eliminating time-invariant factors through consideration of variation within persons over time. To this end, the present study examined the association between variation in HCC and perceived work stress - as assessed by the Effort-Reward-Imbalance (ERI) model - between two points in time (t1 and t2) over one year in a sample of 40 male factory workers. Neither a cross-sectional association, nor a link between change in ERI and HCC levels at t2 was observed. There was however a robust association of the change in ERI with the change of HCC. This effect was independent of baseline HCC and other confounders (Beta = 0.414, S.E. = 0.155, p = 0.012). Accordingly, this is the first study revealing prospective evidence for the associations of work stress with HCC, while excluding potentially time-stable confounding factors, like genetic factors or phenotypic hair color.
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