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Int J Sports Med 2010; 31(2): 95-100
DOI: 10.1055/s-0029-1242809
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Post-Eccentric Exercise Blunted hGH Response

J-S. Kim1 , C. Ugrinowitsch2 , B. W. Craig3
  • 1The Florida State University, Nutrition, Food, and Exercise Sciences, Tallahassee, United States
  • 2School of Physical Education and Sport, University of São Paulo, Sao Paulo, Brazil
  • 3Ball State University, Human Performance Laboratory, Muncie, United States
Further Information

Publication History

accepted after revision October 1, 2009

Publication Date:
17 December 2009 (online)

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Abstract

The purpose of the present study was to test if a previous acute concentric exercise bout blunts hGH response after an eccentric exercise bout. Nine healthy untrained male university students (25.4±0.5 yr, 176.5±1.2 cm, and 79.4±2.0 kg) performed a concentric exercise bout followed by an eccentric exercise bout one week later. Serum human growth hormone (hGH), creatine kinase (CK), and lactate were measured before, immediately and up to 32 h after both exercise bouts. Higher lactate values were observed immediately, 5 and 10 min after the concentric bout (70%, 119%, and 142%, respectively, p<0.05) than the eccentric bout. There was a CK main time effect at 8 and 32 h after the exercise bouts compared to baseline values (p<0.002). However, peak serum CK effect size was higher after the concentric than the eccentric exercise bout, 1.3 and 0.9, respectively. hGH increased after both exercise bouts, however it reached significance only at immediately (207%), 5 min (256%), 10 min (276%), 20 min (300%), and 40 min (168%) after the concentric exercise bout (p<0.05). Our findings suggest that a previous concentric exercise bout may blunt the anabolic response expected after an eccentric exercise bout.

Key words

repeated bout effect - muscle damage - relative torque - muscle regeneration

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Correspondence

Jeong-Su KimPhD 

Assistant Professor

Department of Nutrition, Food and Exercise Sciences

The Florida State University

432 Sandels Building

Tallahassee, FL 32306-1493

USA

Phone: (850) 644-4795

Fax: (850) 645-5000

Email: jkim6@fsu.edu

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