Growth hormone response to training regimen with combined high-and low-intensity resistance exercises

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Bibliographic Details
Title translated into German:Wachstumshormonreaktion auf Training mit kombiniertem hoch- und niedrigintensiven Widerstandstraining
Author:Goto, Kazushige; Ishii, Naokata; Takamatsu, Kaoru
Published in:International journal of sport and health science
Published:2 (2004), S. 111-118, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Electronic resource (online) Print resource
Language:English
ISSN:1880-4012, 0915-3942, 1348-1509
Keywords:
man
Online Access:
Identification number:PU200904002231
Source:BISp

Abstract

We had previously shown that performing a single set of resistance exercise at 50% of 1 repetition maximum (RM) added after a high-intensity, low-repetition exercise (strength-type regimen) greatly enhanced growth hormone (GH) secretion [Goto et al. (2003)]. The present study aimed to investigate the effect of an additional set at 50% to 20% of 1RM after a strength-type regimen on anabolic hormone secretion. Eight male subjects performed bilateral knee extension exercises using a strength-type regimen (5 sets at 90% of 1RM, with 3-min rests), and other 3 types of regimens, in which 1 set of exercise at either 50%, 30% or 20% of 1RM was added immediately after the strength-type regimen (defi ned as C50-type, C30-type and C20-type regimens, respectively). Concentrations of serum GH, testosterone and blood lactate were measured before and after exercises. The number of repetitions in the added set showed a significant dependence on the exercise intensity: 82.3 times in C20-type > 46.1 times in C30-type > 22.6 times in C50-type (p</=0.05). Post-exercise GH concentrations were signifi cantly (p</=0.05) higher in C50- and C30-type regimens than in the strength-type regimen, whereas no significant difference was observed between C20- and strength-type regimens. Testosterone did not change in any types of regimen. These results indicated that performing a single set of exercise at low intensity added after a strength-type regimen caused a significant increase in GH concentration. However, such an effect might be diminished when the intensity of the additional exercise was extremely low (below 20% of 1RM). Verf.-Referat