Cited by 62Growth Hormone and Insulin-like Growth FactorsCardiovascular and exercise physiologyExercise and Physiological Responses

Exercise training decreases the growth hormone (GH) response to acute constant-load exercise

WELTMAN, ARTHUR, WELTMAN, JUDY Y., WOMACK, CHRISTOPHER J., DAVIS, SHALA E., BLUMER, JEFFREY L., GAESSER, GLENN A., HARTMAN, MARK L.·1997·Medicine & Science in Sports & Exercise

Abstract

To assess the influence of exercise training on the growth hormone (GH) response to acute exercise, six untrained males completed a 20-min, high-intensity, constant-load exercise test prior to and after 3 and 6 wk of training (the absolute power output (PO) during each test remained constant x PO = 182.5 +/- 29.5 W). Training increased (pre- vs post-training) oxygen uptake (VO2) at lactate threshold (1.57 +/- 0.33 L.min-1 vs 1.97 +/- 0.24 L.min-1 P < or = 0.05). VO2 at 2.5 mM blood lactate concentration ([HLa]) (1.83 +/- 0.38 L.min-1 vs 2.33 +/- 0.38 L.min-1, P < or = 0.05), and VO2peak (3.15 +/- 0.54 L.min-1 vs 3.41 +/- 0.47 L.min-1, P < or = 0.05). Power output at the lactate threshold (PO-LT) increased with training from 103 +/- 28 to 132 +/- 23W (P < or = 0.05). Integrated GH concentration (20 min exercise + 45 min recovery) (microgram.L-1 x min) after 3 wk (138 +/- 106) and 6 wk (130 +/- 145) were significantly lower (P < or = 0.05) than pre-training (238 +/- 145). Plasma epinephrine and norepinephrine responses to training were similar to the GH response (EPI-pre-training = 2447 +/- 1110; week 3 = 1046 +/- 144; week 6 = 955 +/- 322 pmol.L-1; P < or = 0.05; NE pre-training = 23.0 +/- 5.2; week 3 = 13.4 +/- 4.8; week 6 = 12.1 +/- 6.8 nmol.L-1; P < or = 0.05). These data indicate that the GH and catecholamine response to a constant-load exercise stimulus are reduced within the first 3 wk of exercise training and support the hypothesis that a critical threshold of exercise intensity must be reached to stimulate GH release.

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Crossref · 10.1097/00005768-199705000-00013

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Authors
WELTMAN, A., WELTMAN, J. Y., WOMACK, C. J., DAVIS, S. E., BLUMER, J. L., GAESSER, G. A., & HARTMAN, M. L.
Affiliations
  • University of Virginia (US)
  • Rainbow Babies & Children's Hospital (US)
Venue
Medicine & Science in Sports & Exercise
Published
1997-05
Volume
29
Issue
5
Pages
669-676
ISSN
0195-9131 (ISSN-L)
OpenAlex
W1970287750
Cited by
62
References
28
Citations by year
2025: 1 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 3 · 2018: 3 · 2015: 1 · 2014: 2 · 2013: 2 · 2012: 1
FWCI
1.91
Type
journal article
Language
en
Open access
closed
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ag010997-05)
  • National Institute on Aging (R01AG10997)
  • National Center for Research Resources (RR 00847, M01RR000847)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
exercise training, growth hormone response, acute exercise, constant-load exercise, high-intensity exercise, lactate threshold, oxygen consumption, catecholamines, epinephrine, norepinephrine, training effects, output power, untrained men, blood lactate, peak oxygen uptake, sex differences
MeSH terms
Adult, Epinephrine, Humans, Male, Norepinephrine, Oxygen Consumption, Prospective Studies, Time Factors, Exercise, Lactic Acid, Human Growth Hormone

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