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Plasma cortisol, renin, and aldosterone during an intense heat acclimation program.
Int J Sports Med. 1989 Feb; 10(1):38-42.IJ

Abstract

The physiologic responses to an intense heat acclimation (HA) regimen (treadmill, 41.2 degrees C, 8 days, 56 min exercise/44 min rest) and the effects on stress and fluid balance hormone responses were examined in 13 unacclimated male volunteers. Venous blood samples were collected before (PRE) and after (POST) exercise (days 1, 4, 8) and analyzed for plasma renin activity (PRA), aldosterone (ALD), cortisol (PC), plasma volume shifts (delta PV%), sodium concentration (Na+), and potassium concentration (K+). HA responses (day 1 vs day 8) indicated reduced strain (P less than 0.05): decreased heart rate, rectal temperature, skin temperature, improved defense of PV, and attenuated PC responses. While plasma Na+ demonstrated no change during daily exercise, K+ (P less than 0.01), PC, PRA, and ALD increased (P less than 0.05) more than delta PV%(day 1: -7.1%, day 8: -5.1%) accounted for. Na+ and K+ did not change as a result of HA, and there was no change in fluid balance hormones (e.g., PRA, ALD). It was concluded that this intense heat acclimation regimen reduced physiologic strain by mechanisms other than alterations in fluid balance hormones and offered few physiologic advantages which cannot be gained through conventional heat acclimation techniques (e.g., walking).

Authors+Show Affiliations

U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760-5007.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

2649446

Citation

Armstrong, L E., et al. "Plasma Cortisol, Renin, and Aldosterone During an Intense Heat Acclimation Program." International Journal of Sports Medicine, vol. 10, no. 1, 1989, pp. 38-42.
Armstrong LE, Francesconi RP, Kraemer WJ, et al. Plasma cortisol, renin, and aldosterone during an intense heat acclimation program. Int J Sports Med. 1989;10(1):38-42.
Armstrong, L. E., Francesconi, R. P., Kraemer, W. J., Leva, N., De Luca, J. P., & Hubbard, R. W. (1989). Plasma cortisol, renin, and aldosterone during an intense heat acclimation program. International Journal of Sports Medicine, 10(1), 38-42.
Armstrong LE, et al. Plasma Cortisol, Renin, and Aldosterone During an Intense Heat Acclimation Program. Int J Sports Med. 1989;10(1):38-42. PubMed PMID: 2649446.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Plasma cortisol, renin, and aldosterone during an intense heat acclimation program. AU - Armstrong,L E, AU - Francesconi,R P, AU - Kraemer,W J, AU - Leva,N, AU - De Luca,J P, AU - Hubbard,R W, PY - 1989/2/1/pubmed PY - 1989/2/1/medline PY - 1989/2/1/entrez SP - 38 EP - 42 JF - International journal of sports medicine JO - Int J Sports Med VL - 10 IS - 1 N2 - The physiologic responses to an intense heat acclimation (HA) regimen (treadmill, 41.2 degrees C, 8 days, 56 min exercise/44 min rest) and the effects on stress and fluid balance hormone responses were examined in 13 unacclimated male volunteers. Venous blood samples were collected before (PRE) and after (POST) exercise (days 1, 4, 8) and analyzed for plasma renin activity (PRA), aldosterone (ALD), cortisol (PC), plasma volume shifts (delta PV%), sodium concentration (Na+), and potassium concentration (K+). HA responses (day 1 vs day 8) indicated reduced strain (P less than 0.05): decreased heart rate, rectal temperature, skin temperature, improved defense of PV, and attenuated PC responses. While plasma Na+ demonstrated no change during daily exercise, K+ (P less than 0.01), PC, PRA, and ALD increased (P less than 0.05) more than delta PV%(day 1: -7.1%, day 8: -5.1%) accounted for. Na+ and K+ did not change as a result of HA, and there was no change in fluid balance hormones (e.g., PRA, ALD). It was concluded that this intense heat acclimation regimen reduced physiologic strain by mechanisms other than alterations in fluid balance hormones and offered few physiologic advantages which cannot be gained through conventional heat acclimation techniques (e.g., walking). SN - 0172-4622 UR - https://www.unboundmedicine.com/medline/citation/2649446/Plasma_cortisol_renin_and_aldosterone_during_an_intense_heat_acclimation_program_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2007-1024871 DB - PRIME DP - Unbound Medicine ER -