The Study
Oral hydroxycitrate supplementation enhances glycogen synthesis in exercised human skeletal muscle
This study gave 8 guys a supplement and saw how their muscles stored sugar after working out. It shows the supplement might help muscles store more sugar, but it doesn't prove it works for everyone or makes people stronger or healthier in real life.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
After running or cycling, your muscles need to refill their energy stores. This study tested if a supplement called HCA helps your muscles refill energy faster and use fat instead of sugar.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 559 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—faster glycogen refill could help athletes recover quicker, and lower insulin without higher blood sugar suggests better insulin sensitivity, which is good for metabolic health.
- 2With HCA, muscles refilled glycogen 100% faster, insulin dropped 39%, fat burning increased, GLUT4 protein decreased, and FAT/CD36 gene increased—all while blood sugar stayed the same.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
British Journal of Nutrition
Year
2011
Authors
I-Shiung Cheng, Shih-Wei Huang, Hsang-Chu Lu, Ching-Lin Wu, Ying-Chieh Chu, Shin-Da Lee, Chih-Yang Huang, C. Kuo
Related Content
Claims (5)
Taking 500 mg of hydroxycitrate after endurance exercise increases the body's use of fat for energy during recovery, as shown by a lower respiratory quotient, while free fatty acids and glycerol in the blood remain unchanged in healthy young men.
Taking 500 mg of hydroxycitrate after endurance exercise lowers GLUT4 protein levels in the skeletal muscle of healthy young men, even though glycogen synthesis increases.
Taking 500 mg of hydroxycitrate after endurance exercise increases the amount of FAT/CD36 mRNA in the skeletal muscle of healthy young men.
Taking 500 mg of hydroxycitrate with a high-carbohydrate meal after endurance exercise lowers the insulin response by about 39% in healthy young men without changing blood glucose levels.
Taking 500 mg of hydroxycitrate with a high-carbohydrate meal after endurance exercise doubles the rate at which muscle glycogen is restored in healthy young men.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.