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| Research article summary (published 30 May 2003): |
A single set of low intensity resistance exercise immediately following high intensity resistance exercise stimulates growth hormone secretion in men.
Full Abstract
AIM:
The purpose of the present study was to examine the effects of an additional set immediately following high intensity resistance exercise on growth hormone (GH) response.
METHODS:
Subjects (n=8) performed 4 resistance exercise protocols (bilateral knee extension exercise) on separate days. The protocols were categorized into 2 types of protocol, namely "Strength-up type (S-type)" and "Combination type (Combi-type)". The S-type was resistance exercise which consisted of 5 sets at 90% of 1 repetition maximum (RM) with 3-min rest periods between sets, whereas the Combi-type is a training protocol which adds an additional set (either 50% of 1 RM [C50-type], 70% of 1 RM [C70-type] or 90% of 1 RM [C90-type]) to the S-type. Serum GH concentration and blood lactate concentration were determined pre-exercise and at 0-60 min postexercise. Relative changes in thigh girth and maximal unilateral isometric strength were determined pre-exercise and immediately postexercise.
RESULTS:
The increasing values of GH concentration (DGH) in the S-type was the lowest of all protocols. On the other hand, DGH in the C50-type showed a significantly (p<0.05) higher increase than in the S-type and C90-type, and a relatively higher increase than in the C70-type.
CONCLUSION:
These results suggests that a high intensity, low volume training protocol to induce neural adaptation resulted in little GH response, but GH secretion was increased by performing a single set of low intensity resistance exercise at the end of a series of high intensity resistance sets.
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Author information
Author/s: Goto, K (K); Sato, K (K); Takamatsu, K (K);
Affiliation: Doctoral Program in Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.
Journal and publication information
Publication Type: Journal Article
Journal: The Journal of sports medicine and physical fitness (J Sports Med Phys Fitness), published in Italy. (Language: eng)
Reference: 2003-Jun; vol 43 (issue 2) : pp 243-9
Dates: Created 2003/07/10; Completed 2003/10/07; Revised 2004/11/17;
PMID: 12853908, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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