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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergstr&#246;m Technique
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Published on: September 10, 2014

Post-eccentric exercise blunted hGH response.

J-S Kim1, C Ugrinowitsch, B W Craig

  • 1The Florida State University, Department of Nutrition, Food and Exercise Sciences, Tallahassee, FL 32306-1493, USA. jkim6@fsu.edu

International Journal of Sports Medicine
|March 12, 2010
PubMed
Summary
This summary is machine-generated.

A prior concentric exercise session may reduce the human growth hormone (hGH) anabolic response following eccentric exercise. This finding impacts exercise programming for muscle growth.

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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergstr&#246;m Technique
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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Sports Science

Background:

  • Eccentric exercise is known to stimulate anabolic hormone release, crucial for muscle adaptation.
  • The impact of preceding exercise types on subsequent hormonal responses requires further investigation.

Purpose of the Study:

  • To determine if a prior acute concentric exercise bout attenuates the human growth hormone (hGH) response to a subsequent eccentric exercise bout.
  • To compare physiological markers including hGH, creatine kinase (CK), and lactate between concentric and eccentric exercise protocols.

Main Methods:

  • Nine healthy, untrained male university students participated in a controlled study.
  • Participants completed both a concentric and an eccentric exercise bout on separate occasions, one week apart.
  • Serum hGH, CK, and lactate levels were measured pre-exercise and at multiple time points up to 32 hours post-exercise.

Main Results:

  • Lactate levels were significantly higher immediately after concentric exercise compared to eccentric exercise.
  • While both exercise types elevated hGH, the response reached statistical significance only after the concentric bout.
  • Peak serum creatine kinase (CK) effect size was greater following concentric exercise (1.3) than eccentric exercise (0.9).

Conclusions:

  • A preceding concentric exercise bout may blunt the expected anabolic human growth hormone (hGH) response after eccentric exercise.
  • This suggests a potential interference effect of exercise modality order on hormonal adaptations.
  • Findings have implications for optimizing exercise sequencing to maximize training-induced anabolic responses.