Several studies have examined whether coenzyme Q10 (CoQ10) supplementation influences muscle stress and performance during intense physical activity. CoQ10 plays a central role in mitochondrial energy production and also functions as an antioxidant, which has led researchers to explore its effects in athletic settings.
A double-blind, placebo-controlled study published in the British Journal of Nutrition (2008; 100:903–909) investigated CoQ10 supplementation and markers of muscle damage following strenuous exercise. The study involved 18 trained athletes who received either 300 mg/day of CoQ10 or a placebo for 20 days. During the final six days of the study, participants engaged in approximately 5½ hours of intense exercise per day.
Blood markers associated with muscle damage—including myoglobin and creatine kinase—were measured throughout the study. While these markers increased in both groups as expected, the increases were significantly lower in the athletes receiving CoQ10, suggesting reduced exercise-related muscle damage.
Another double-blind, placebo-controlled study published in the Journal of the International Society of Sports Nutrition (2008; 5(1):8) examined CoQ10 supplementation and exercise performance. This study included 22 trained athletes and 19 untrained individuals. Participants were randomly assigned to receive either a placebo or 200 mg of CoQ10 one hour before a battery of exercise tests. Blood samples and muscle biopsies were collected before and after exercise.
Following this initial testing, participants continued supplementation with either placebo or 100 mg of CoQ10 twice daily for two weeks. At the end of the supplementation period, the exercise tests and measurements were repeated. After two weeks of CoQ10 supplementation, researchers observed a trend toward increased time to exhaustion, although the results did not reach strong statistical significance.
Together, these studies suggest that CoQ10 supplementation may influence muscle stress responses during intense exercise and could modestly affect exercise tolerance. However, the small sample sizes and short study durations mean that further research is needed to clarify the magnitude and consistency of these effects.
