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Salbutamol intake and substrate oxidation during submaximal exercise.

A Arlettaz1, B Le Panse, H Portier

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Salbutamol did not alter overall energy expenditure or substrate oxidation during 1-hour exercise. However, it did affect substrate balance and decrease adrenocorticotropic hormone (ACTH) levels in trained men.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Pharmacology

Background:

  • Salbutamol, a beta-2 agonist, is investigated for potential ergogenic effects.
  • Substrate oxidation changes are hypothesized as a mechanism for salbutamol's ergogenic potential during exercise.

Purpose of the Study:

  • To determine if salbutamol ingestion alters substrate oxidation during submaximal exercise.
  • To examine the hormonal and metabolic responses to salbutamol during endurance exercise.

Main Methods:

  • Eight recreationally trained men completed a 1-hour submaximal exercise test at 60% VO(2) peak.
  • Participants ingested either a placebo or 4 mg of salbutamol before exercise.
  • Gas exchange and blood samples (for GH, ACTH, insulin, glucose, lactate) were analyzed.

Main Results:

  • No significant differences in total energy expenditure or substrate oxidation were observed between salbutamol and placebo conditions.
  • Salbutamol significantly altered substrate oxidation balance after 40 minutes of exercise.
  • Adrenocorticotropic hormone (ACTH) levels were significantly decreased with salbutamol during the final 10 minutes of exercise, with no other hormonal or metabolic differences noted.

Conclusions:

  • The hypothesis that salbutamol enhances endurance exercise via altered substrate oxidation lacks strong support for shorter durations.
  • Potential ergogenic effects of salbutamol may require longer exercise durations to manifest through substrate oxidation changes.