Acute L-Carnitine Supplementation Does Not Improve CrossFit^® Performance: A Randomized, Double-Blind,...

Area of Science:

• Exercise Physiology
• Nutritional Science
• Sports Performance

Background:

• L-carnitine supplementation is theorized to enhance exercise performance, particularly in high-intensity activities.
• Evidence for L-carnitine's ergogenic effects remains inconclusive.
• This study investigated L-carnitine tartrate's impact on CrossFit performance.

Purpose of the Study:

• To determine if acute L-carnitine tartrate supplementation improves performance in a high-intensity CrossFit workout.
• To assess secondary outcomes including perceived exertion and physiological markers.

Main Methods:

• Randomized, double-blind, placebo-controlled crossover trial with 20 trained male recreational CrossFit athletes.
• Participants ingested 3g L-carnitine tartrate or placebo 90 minutes before performing the

Main Results:

• L-carnitine tartrate supplementation did not significantly alter total repetitions completed during the

Conclusions:

• Acute 3g L-carnitine tartrate supplementation does not enhance performance in recreational CrossFit athletes.
• Further research with larger sample sizes and diverse populations is warranted.
• Investigating factors like sex and carbohydrate co-ingestion may clarify L-carnitine's role in exercise performance.