Short-term reliability of inflammatory mediators and response to exercise in the heat

Guy, Joshua H., Edwards, Andrew M., Miller, Catherine M., Deakin, Glen B., and Pyne, David B. (2017) Short-term reliability of inflammatory mediators and response to exercise in the heat. Journal of Sports Sciences, 35 (16). pp. 1622-1628.

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Prospective application of serum cytokines, lipopolysaccharide (LPS), and heat shock proteins (eHSPs) requires reliable measurement of these biomarkers that can signify exercise-induced heat stress in hot conditions. To accomplish this, both short-term (7 day) reliability (at rest, n = 12) and the acute responsiveness of each biomarker to exercise in the heat (pre and post 60-min cycling, 34.5°C and 70% RH, n = 20) were evaluated. Serum was analysed for the concentration of C-reactive protein (CRP), interleukin-6 (IL-6), heat shock protein 72 (eHSP72), immunoglobulin M (IgM) and LPS. Test–retest reliability was determined as the coefficient of variation (CV). Biomarkers with the least short-term within-participant variation were IL-6 (19%, ±20%; CV, ±95% confidence limits (CL)) and LPS (23%, ±13%). Greater variability was observed for IgM, eHSP72 and CRP (CV range 28–38%). IL-6 exhibited the largest increase in response to acute exercise (95%, ±11%, P = < 0.001) and although CRP had a modest CV (12%, ±7%), it increased substantially post-exercise (P = 0.02, ES; 0.78). In contrast, eHSP72 and LPS exhibited trivial changes post-exercise. It appears variation of common inflammatory markers after exercise in the heat is not always discernible from short-term (weekly) variation.

Item ID: 45897
Item Type: Article (Research - C1)
ISSN: 1466-447X
Keywords: Lipopolysaccharide, heat shock proteins, inflammatory cytokines, heat tolerance
Date Deposited: 30 Sep 2016 01:30
FoR Codes: 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420701 Biomechanics @ 50%
42 HEALTH SCIENCES > 4207 Sports science and exercise > 420799 Sports science and exercise not elsewhere classified @ 50%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920401 Behaviour and Health @ 100%
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