Exercise intensity-related responses of beta-endorphin and catecholamines

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Bibliographic Details
Title translated into German:Reaktionen der Beta-Endorphine und Katecholamine in Zusammenhang mit der Belastungsintensitaet
Author:McMurray, R.G.; Forsythe, W.A.; Mar, M.H.; Hardy, C.J.
Published in:Medicine and science in sports and exercise
Published:19 (1987), 6 , S. 570-574, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Language:English
ISSN:0195-9131, 1530-0315
Keywords:
sex
Online Access:
Identification number:PU198807007813
Source:BISp

Abstract

Ten men and 10 women exercised on a bicycle ergometer for 20 min at 40,60, and 80 maximal oxygen uptake (VO2max) to determine the relationship between plasma beta-endorphin, catecholamines, and exercise intensity. Compared to rest, plasma beta-endorphins were not significantly elevated during the 40 and 60 workloads (4.8 +- 1.0 pmol/l vs 3.8 +- 0.7 and 6.3 +0.9, respectively). In contrast, the 80 exercise significantly elevated endorphins to 16.1 +- 4.0 pmol/l. Plasma norepinephrine concentrations were 0.30 +- 0.04 ng/ml at rest and increased with exercise intensity (40 = 0.60 +- 0.05, 60 = 0.93 +- 0.07, 80 = 2.00 +- 0.14, VO2max = 2.55 +- 0.14 ng/ml) Plasma epinephrine followed the same trend (rest = 0.07 +- 0.01, 40 = 0.33 +- 0.03, 60 = 0.49 +- 0.02, 80 = 0.88 +- 0.07, VO2max = 0.95 +- 0.06 ng/ml) Norepinephrine was found tosignificantly correlate to endorphins (r = 0.499; P.0.02). Conversely, epinephrine was not correlated with beta-endorphin (r=0.309; P > 0.05). The low correlation suggests a weak relationship between beta-endorphin and catecholamine responses during exercise. The results of this investigation suggest that the relationship between beta-endorphin and exercise intensity is curvilinear, with anaerobic activity producing the most significant endorphin response. It was also noted that the beta-endorphin response was not related to gender, but the amine respone to exercise was gender-related, being greater for the men. Verf.-Referat