Muscle and plasma coenzyme Q10 concentration, aerobic power and exercise economy of healthy men in response to four weeks of supplementation

Zhou, Shi and Zhang, Yong and Davie, A. and Marshall-Gradisnik, S. and Hu, H. and Wang, Jianxiong and Brushett, D. (2005) Muscle and plasma coenzyme Q10 concentration, aerobic power and exercise economy of healthy men in response to four weeks of supplementation. Journal of Sports Medicine and Physical Fitness, 45 (3). pp. 337-346. ISSN 0022-4707

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Aim. To investigate whether 4 weeks of oral supplementation with coenzyme Q10 (CoQ10) would increase its concentration in skeletal muscle, and affect aerobic power (V̇O2max) and oxygen consumption during submaximal exercise in healthy, physically active men.
Methods. Six volunteers with an average (±SD) age of 29.7±7.2 years and V̇O2max of 39.4±8.5 mL·kg -1·min-1, participated in a single-blind trial. The experiment consisted of 4 2-week phases, in the order of placebo run-in, CoQ10 supplementation (150 mg daily), CoQ10 (150 mg) plus vitamin E (1 000 IU daily), and placebo wash-out. A three-stage cycle economy test (4 minutes at each of 50, 100, and 150 watts), followed by a V̇O 2max test (25 watts increment every minute till exhaustion), were performed prior to the supplementation and at the end of each phase. Blood samples were taken pre and post each V̇O2max test, and biopsy samples were obtained from the vastus lateralis muscle pre and post the 4 weeks of CoQ10 supplementation. Results. The plasma CoQ10 concentration was significantly elevated by the supplementation (P<0.05), however, it did not vary significantly pre and post each exercise test (P>0.05). The muscle CoQ10 concentration, V̇O2max ventilatory threshold, exercise economy and oxygen deficit showed no significant changes in response to the supplementation. Conclusion. It was speculated that the non-significant effects of supplementation in healthy, non CoQ 10-deficient men could be due to either that the mitochondrial membrane is normally saturated with CoQ10, or that the selected exercise testing protocol and variables were not sensitive enough to detect the effects.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 13 May 2010 07:51
Last Modified: 18 Sep 2013 01:05
Uncontrolled Keywords: oxidative phosphorylation; oxygen consumption; ubiquinol; ventilatory threshold
Fields of Research : 11 Medical and Health Sciences > 1111 Nutrition and Dietetics > 111101 Clinical and Sports Nutrition
11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110602 Exercise Physiology
06 Biological Sciences > 0601 Biochemistry and Cell Biology > 060107 Enzymes
Socio-Economic Objective: C Society > 92 Health > 9204 Public Health (excl. Specific Population Health) > 920411 Nutrition

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