Antioxidants, carnitine, and choline as putative ergogenic aids

Area of Science:

• Sports Nutrition
• Exercise Physiology
• Nutritional Biochemistry

Background:

• Nutritional supplements like antioxidant vitamins, carnitine, and choline are often promoted for enhancing athletic performance.
• These supplements are believed to act through different mechanisms, including free radical scavenging, lipid oxidation, and neurotransmitter synthesis.

Purpose of the Study:

• To critically evaluate the scientific evidence supporting the ergogenic effects of antioxidant vitamins, carnitine, and choline.
• To determine if current research justifies the use of these supplements for improving physical performance.

Main Methods:

• Review of existing scientific literature on antioxidant vitamins, carnitine, and choline.
• Analysis of studies investigating the impact of these supplements on exercise physiology markers and physical performance.

Main Results:

• Antioxidant vitamins show no direct performance benefits in well-fed individuals, though they may mitigate exercise-induced oxidative stress.
• Evidence supporting carnitine's ergogenic potential (e.g., increased VO2max, reduced lactate) is generally weak and inconclusive.
• Choline supplementation lacks definitive human studies to support claims of preventing acetylcholine decline and improving muscular work capacity.

Conclusions:

• The efficacy of antioxidant vitamins, carnitine, and choline as ergogenic aids remains largely theoretical and unsupported by robust scientific data.
• Contradictory and equivocal findings necessitate further rigorous research before recommending these supplements for performance enhancement.