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The impact of metabolic stress on hormonal responses and muscular adaptations.
Med Sci Sports Exerc. 2005 Jun; 37(6):955-63.MS

Abstract

PURPOSE

The purpose of this study was to examine the impact of exercise-induced metabolic stress on hormonal responses and chronic muscular adaptations.

METHODS

We compared the acute and long-term effects of an "NR regimen" (no-rest regimen) and those of a "WR regimen" (regimen with rest period within a set). Twenty-six male subjects were assigned to either the NR (N = 9), WR (N = 9), or control (CON, N = 8) groups. The NR regimen consisted of 3-5 sets of 10 repetitions at 10-repetition maximum (RM) with an interset rest period of 1 min (lat pulldown, shoulder press, and bilateral knee extension). In the WR regimen, subjects completed the same protocol as the NR regimen, but took a 30-s rest period at the midpoint of each set of exercises in order to reduce exercise-induced metabolic stress. Acute hormonal responses to both regimens were measured followed by a 12-wk period of resistance training.

RESULTS

Measurements of blood lactate and serum hormone concentrations after the NR and WR regimens showed that the NR regimen induced strong lactate, growth hormone (GH), epinephrine (E), and norepinephrine (NE) responses, whereas the WR regimen did not. Both regimens failed to cause significant changes in testosterone. After 12 wk of resistance training, the NR regimen caused greater increases in 1RM (P < 0.01), maximal isometric strength (P < 0.05), and muscular endurance (P < 0.05) with knee extension than the WR regimen. The NR group showed a marked increase (P < 0.01) in muscle cross-sectional area, whereas the WR and CON groups did not.

CONCLUSION

These results suggest that exercise-induced metabolic stress is associated with acute GH, E, and NE responses and chronic muscular adaptations following resistance training.

Authors+Show Affiliations

Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15947720

Citation

Goto, Kazushige, et al. "The Impact of Metabolic Stress On Hormonal Responses and Muscular Adaptations." Medicine and Science in Sports and Exercise, vol. 37, no. 6, 2005, pp. 955-63.
Goto K, Ishii N, Kizuka T, et al. The impact of metabolic stress on hormonal responses and muscular adaptations. Med Sci Sports Exerc. 2005;37(6):955-63.
Goto, K., Ishii, N., Kizuka, T., & Takamatsu, K. (2005). The impact of metabolic stress on hormonal responses and muscular adaptations. Medicine and Science in Sports and Exercise, 37(6), 955-63.
Goto K, et al. The Impact of Metabolic Stress On Hormonal Responses and Muscular Adaptations. Med Sci Sports Exerc. 2005;37(6):955-63. PubMed PMID: 15947720.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The impact of metabolic stress on hormonal responses and muscular adaptations. AU - Goto,Kazushige, AU - Ishii,Naokata, AU - Kizuka,Tomohiro, AU - Takamatsu,Kaoru, PY - 2005/6/11/pubmed PY - 2005/9/10/medline PY - 2005/6/11/entrez SP - 955 EP - 63 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 37 IS - 6 N2 - PURPOSE: The purpose of this study was to examine the impact of exercise-induced metabolic stress on hormonal responses and chronic muscular adaptations. METHODS: We compared the acute and long-term effects of an "NR regimen" (no-rest regimen) and those of a "WR regimen" (regimen with rest period within a set). Twenty-six male subjects were assigned to either the NR (N = 9), WR (N = 9), or control (CON, N = 8) groups. The NR regimen consisted of 3-5 sets of 10 repetitions at 10-repetition maximum (RM) with an interset rest period of 1 min (lat pulldown, shoulder press, and bilateral knee extension). In the WR regimen, subjects completed the same protocol as the NR regimen, but took a 30-s rest period at the midpoint of each set of exercises in order to reduce exercise-induced metabolic stress. Acute hormonal responses to both regimens were measured followed by a 12-wk period of resistance training. RESULTS: Measurements of blood lactate and serum hormone concentrations after the NR and WR regimens showed that the NR regimen induced strong lactate, growth hormone (GH), epinephrine (E), and norepinephrine (NE) responses, whereas the WR regimen did not. Both regimens failed to cause significant changes in testosterone. After 12 wk of resistance training, the NR regimen caused greater increases in 1RM (P < 0.01), maximal isometric strength (P < 0.05), and muscular endurance (P < 0.05) with knee extension than the WR regimen. The NR group showed a marked increase (P < 0.01) in muscle cross-sectional area, whereas the WR and CON groups did not. CONCLUSION: These results suggest that exercise-induced metabolic stress is associated with acute GH, E, and NE responses and chronic muscular adaptations following resistance training. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/15947720/The_impact_of_metabolic_stress_on_hormonal_responses_and_muscular_adaptations_ L2 - https://Insights.ovid.com/pubmed?pmid=15947720 DB - PRIME DP - Unbound Medicine ER -