Markers of physiological stress during exercise under conditions of normoxia, normobaric hypoxia, hypobaric hypoxia, and genuine high altitude.

Woods, D.R., O Hara, J.P., Boos, C., Hodkinson, P.D., Tsakirides, C., Hill, N.E., Jose, D., Hawkins, A., Phillipson, K., Hazlerigg, A., Arjomandkhah, N., Gallagher, L., Holdsworth, D., Cooke, M., Green, N.D.C. and Mellor, A., 2017. Markers of physiological stress during exercise under conditions of normoxia, normobaric hypoxia, hypobaric hypoxia, and genuine high altitude. European Journal of Applied Physiology, 117 (5), 893- 900.

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DOI: 10.1007/s00421-017-3573-5

Abstract

Purpose: To investigate whether there is a differential response at rest and following exercise to conditions of genuine high altitude (GHA), normobaric hypoxia (NH), hypobaric hypoxia (HH), and normobaric normoxia (NN). Method: Markers of sympathoadrenal and adrenocortical function [plasma normetanephrine (PNORMET), metanephrine (PMET), cortisol], myocardial injury [highly sensitive cardiac troponin T (hscTnT)], and function [N-terminal brain natriuretic peptide (NT-proBNP)] were evaluated at rest and with exercise under NN, at 3375 m in the Alps (GHA) and at equivalent simulated altitude under NH and HH. Participants cycled for 2 h [15-min warm-up, 105 min at 55% Wmax (maximal workload)] with venous blood samples taken prior (T0), immediately following (T120) and 2-h post-exercise (T240). Results: Exercise in the three hypoxic environments produced a similar pattern of response with the only difference between environments being in relation to PNORMET. Exercise in NN only induced a rise in PNORMET and PMET. Conclusion: Biochemical markers that reflect sympathoadrenal, adrenocortical, and myocardial responses to physiological stress demonstrate significant differences in the response to exercise under conditions of normoxia versus hypoxia, while NH and HH appear to induce broadly similar responses to GHA and may, therefore, be reasonable surrogates.

Item Type:Article
ISSN:1439-6319
Uncontrolled Keywords:High altitude; Hypobaric hypoxia; Normobaric hypoxia; NT-proBNP; Adrenal; Cardiac Exercise
Group:Faculty of Health & Social Sciences
ID Code:28553
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:06 Apr 2017 10:06
Last Modified:17 May 2017 15:26

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