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Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
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Target Cell Response to Hormones01:22

Target Cell Response to Hormones

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Regulation of Metabolism01:19

Regulation of Metabolism

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Related Experiment Video

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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
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Beta-alanine and the hormonal response to exercise.

J Hoffman1, N A Ratamess, R Ross

  • 1Health and Exercise Science, The College of New Jersey, Ewing, New Jersey 08628, United States. hoffmanj@TCNJ.edu

International Journal of Sports Medicine
|June 13, 2008
PubMed
Summary

Beta-alanine supplementation significantly enhances muscular endurance in resistance-trained athletes, increasing total repetitions and power output. However, it does not alter the acute hormonal response to exercise.

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Published on: August 22, 2014

Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Sports Science

Background:

  • Beta-alanine is a popular supplement for athletes seeking performance improvements.
  • Resistance training elicits significant acute endocrine responses, including changes in growth hormone, testosterone, and cortisol.
  • Understanding the combined effects of beta-alanine supplementation and resistance exercise on performance and hormonal markers is crucial for athletes and coaches.

Purpose of the Study:

  • To investigate the effects of 4 weeks of beta-alanine supplementation on resistance exercise performance in experienced male athletes.
  • To examine the impact of beta-alanine on acute endocrine responses (growth hormone, testosterone, cortisol) following a resistance exercise bout.
  • To determine if beta-alanine supplementation influences the hormonal milieu during and after intense resistance training.

Main Methods:

  • Eight experienced resistance-trained men participated in a double-blind, placebo-controlled study.
  • Participants supplemented with 4.8 g/day of beta-alanine or placebo for 4 weeks.
  • An acute resistance exercise protocol (6 sets of 12 reps squat at 70% 1-RM) was performed pre- and post-supplementation.
  • Blood samples were collected at baseline, immediately, 15, and 30 minutes post-exercise to measure hormone concentrations.

Main Results:

  • Beta-alanine supplementation resulted in a 22% increase in total repetitions performed compared to placebo (p < 0.05).
  • Mean power output was significantly greater in the beta-alanine group (98.4 W) versus placebo (7.2 W).
  • Both groups exhibited elevated growth hormone and cortisol levels post-exercise, with no significant differences between beta-alanine and placebo groups.
  • Testosterone levels remained unchanged from baseline in both groups throughout the study.

Conclusions:

  • Four weeks of beta-alanine supplementation effectively enhances muscular endurance and power output during resistance training in experienced athletes.
  • The observed performance improvements with beta-alanine supplementation do not appear to modulate the acute endocrine response to a single bout of resistance exercise.
  • Beta-alanine may be a beneficial ergogenic aid for athletes focused on improving resistance training capacity without significantly altering key hormonal markers.