[Performance modification in sports by beta receptor blockers].

Area of Science:

• Exercise Physiology
• Pharmacology

Context:

• Beta-adrenoceptor-blockers are commonly used medications with known effects on cardiovascular function.
• Their influence on physical performance, particularly in athletes, is a subject of ongoing research.
• Understanding these effects is crucial for optimizing training and competition strategies.

Purpose:

• To elucidate the multifaceted effects of beta-adrenoceptor-blockers on human physical performance.
• To detail the hemodynamic, metabolic, and thermoregulatory alterations induced by these drugs.
• To differentiate the impact of selective versus non-selective beta-blockade on exercise capacity.

Summary:

• Beta-blockade reduces heart rate and cardiac output, limiting muscular blood flow and slightly decreasing oxygen uptake and maximal aerobic capacity.
• Metabolically, acute beta-blockade restricts lipolysis and, during maximal exercise, reduces glycogenolysis (especially with non-selective agents), while serum potassium may slightly increase.
• Sweat production is enhanced, and arterial lactate concentration is typically diminished post-beta-blockade.

Impact:

• Beta-adrenoceptor-blockers significantly influence athletic performance across various sports due to their diverse physiological effects.
• The findings are relevant for sports medicine professionals, coaches, and athletes considering or using these medications.
• This knowledge aids in managing potential performance decrements and understanding physiological adaptations.