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Quercetin improved isometric strength

Earlier exercise studies using antioxidants have had inconsistent muscle-damage results.

In this study, 12 moderately active men, average age 26, took a placebo or 500 mg of quercetin at breakfast and again 12 hours later over two weeks. After a three week nontreatment period, the men switched groups. Putting muscles under load while lengthening them is the fastest way to induce damage.

At the start and end of the study, the men did 10 sets of 10 maximal muscle-lengthening contractions. While the placebo group had not changed, men taking quercetin saw a 4.7 percent increase in isometric strength, and muscle fiber decay was significantly lower.

Doctors also saw fewer biochemical signs of damage, and observed better muscle function, commenting that quercetin seems to be a suitable nutritional supplement to reduce discomfort, maintain strength, and may improve overall fitness.

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