Reference code: | PT/FB/BL-2010-096.09 |
Location: | Arquivo PCA - Pasta 8/2010
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Title:
| Post awakening salivary cortisol secretion and trait well-being: The importance of sample timing accuracy
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Publication year: | 2015
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URL:
| http://www.psyneuen-journal.com/article/S0306-4530(15)00169-9/abstract
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Abstract/Results: | ABSTRACT:
Indices of post awakening cortisol secretion (PACS), include the rise in cortisol(cortisol awakening response: CAR) and overall cortisol concentrations (e.g. area under thecurve with reference to ground: AUCg) in the first 30—45 min. Both are commonly investi-gated in relation to psychosocial variables. Although sampling within the domestic setting isecologically valid, participant non-adherence to the required timing protocol results in erro-neous measurement of PACS and this may explain discrepancies in the literature linking thesemeasures to trait well-being (TWB). We have previously shown that delays of little over 5 min(between awakening and the start of sampling) to result in erroneous CAR estimates. In thisstudy, we report for the first time on the negative impact of sample timing inaccuracy (verifiedby electronic-monitoring) on the efficacy to detect significant relationships between PACS andTWB when measured in the domestic setting.Healthy females (N = 49, 20.5 ± 2.8 years) selected for differences in TWB collected salivasamples (S1—4) on 4 days at 0, 15, 30, 45 min post awakening, to determine PACS. Adherence tothe sampling protocol was objectively monitored using a combination of electronic estimatesof awakening (actigraphy) and sampling times (track caps).Relationships between PACS and TWB were found to depend on sample timing accuracy. LowerTWB was associated with higher post awakening cortisol AUCg in proportion to the mean sampletiming accuracy (p < .005). There was no association between TWB and the CAR even taking intoaccount sample timing accuracy. These results highlight the importance of careful electronicmonitoring of participant adherence for measurement of PACS in the domestic setting. Meansample timing inaccuracy, mainly associated with delays of >5 min between awakening andcollection of sample 1 (median = 8 min delay), negatively impacts on the sensitivity of analysisto detect associations between PACS and TWB.
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Accessibility: | Document exists in file
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Copyright/Reproduction:
| By permission
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Language:
| eng
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Author:
| Smyth, N.
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Secondary author(s):
| Thorn, L., Hucklebridge, F., Evans, P., Clow, A.
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Document type:
| Article
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Number of reproductions:
| 1
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Reference:
| Smyth, N., Thorn, L., Hucklebridge, F., Evans, P., & Clow, A. (2015). Post awakening salivary cortisol secretion and trait well-being: The importance of sample timing accuracy. Psychoneuroendocrinology, 58, 141-151. https://doi.org/10.1016/j.psyneuen.2015.04.019
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2-year Impact Factor: | 4.704|2015
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Times cited: | 9|2025-02-10
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Indexed document: | Yes
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Quartile: | Q1
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Keywords: | Cortisol / Saliva / CAR / AUCg / Awakening / Non-adherence / Trait well-being (TWB)
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