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  Last updated: 8/29/2018


Free radicals? are molecules with an unpaired electron, and are a normal by product in all biologic systems. The free radicals arealways in search of another substance to pair with this electron. When they do so, they can produce cellular damage. An example is lipid peroxidation (damage of lipid membranes) which changes a cell's membrane protein structureand has been - proposed as a culprit in the development of heart disease and cancer.

An antioxidant, as the name suggests, can neutralize free radicals before they interact with living tissue, detoxifying them with the formation of water and oxygen.The vitamins (C, E, and beta carotene) arecommon antioxidants in our diet.

Although the discussion of antioxidants is usually focused on cardiovascular health, it has been suggested that free radicals may contribute to a slow recovery after tough workouts, thus antioxidants may speed uprecovery. Many sports drinks tout their antioxidant content.

Studies on free radicals in exercise suggest that althoughexercise does increase the rate of lipid peroxidation (presumablythe result of an increase in the formation of free radicals), there is a parallel increase in the natural antioxidant activity in the blood.And with regular training, our natural antioxidant defense system increases even further.There is little data as to which has the upper hand in this balancing act - the free radicals or the defenses. It has been suggested that "weekend warriors" who do not have a regular training program, might be more susceptible to free radical damage.


Numerous studies have produced conflicting results.

One suggested that the use of antioxidants in the form of vitamins C, E, and beta carotene decreased muscle damage in a group of runners as compared to a control group. The only controlled studies were with 600 IU of vit E for 2 days before exercise (no effect) and a second with 3 grams of vit C per day for 3 days before and 4 days after an exercise bout (reduced soreness). However, none have suggested a beneficial effect of any of the antioxidant vitamins on actual exercise performance or the rate of post-exercise recovery in athletes maintaining a balanced diet.

There is considerable speculation on the long term benefits of antioxidants in general. A study of nurses and male professionals published in 1993 demonstrated a lower rate of heart disease in those taking Vit E supplements. And a study from China indicated that the use of a multivitamin, containing antioxidants among other things, lowered the cancer death rate by 13%. However a more recent study (1996) indicated the opposite, that patients at risk for lung cancer had a HIGHER cancer rate if they took beta carotene supplements, and the study was terminated early because of those results.

How about antioxidants in cardiovascular disease - an area where there has been considerable interest and research? The most recent study demonstrated no benefit of antioxidants over placebo in blunting the effect of atherosclerosis, and indeed even suggested some harm in that antioxidants appeared to blunt the effectiveness of a proven therapy (simvastatin-niacin). As an aside, therehas been interest in the benefits of other vitamins (B vitamins and folate) in the treatment of coronary artery disease - via their effect on homocysteine metabolism. The evidence is strong enough that one of my cardiology partners routinely puts his post angioplasty patients on a multivitamin plus an additional 400 mcg of folic acid and 50 mg of vitamin B6.

The bottom line is that there is little to suggest a short term performance benefitfrom the use of antioxidants in the competitive athlete. And plenty of controversy as to any additional long term health benefits. Although there is no evidence that they will do you any harm in the usual doses, mega-doses have been reported to have side effects and may actually decrease optimum physical performance.

In 2014, a review of antioxidantssuggested that free radicals were important as a cellsignalling mechanism, involved in promoting muscle health. And a paper in2015, investigating the mechanism by which interval training improved performance, concluded "...(these changes) did not occur in muscles exposed to antioxidant, which offersan explanation for why antioxidants blunt effects of endurance training."

And recently the following article suggested that not only do the benefits of reservatol (an antioxidant) NOT translatefrom an animal model to humans, but it actually appears to have a detrimental effect on aerobic training.

So we have very little evidence to support a health or performance benefit with antioxidant supplements,and a suggestion that they may actually have a negative impact on performance improvement.

My take away? As there is general agreement on the health benefits of fruits and vegetables, whichcontain not only vitamins and antioxidants, but also other healthful micronutrients, and no proof thatantioxidant supplements are of any health benefit, increasing the fruits and vegetables in our diet seems to be the best approach.

Following is a list of a few natural sources of antioxidants:


Physical trauma and micro tears are the likely explanation for post exercise muscle pain.But free radicals (oxidative stress) have been suggested as a contributing factor. If so,it makes sense that antioxidants could be a possible treatment. This is aninteresting blog (well referenced although I could only read the abstracts and not thecomplete articles), that suggests you might be able to speed recovery by modifyingyour diet to increase natural antioxidants and reducing exercise related oxidative injury.

It sounds logical. But we now have what I feel is a more powerful study,a meta-analysis of 50 studies.Although there was a small benefit (less muscle discomfort) from antioxidants, it didn't seem to beenough to justify the hassles of a dietary change (just for the DOMS effect).

Eating fruits and vegetables is definitely a plus for your overall health, and there may be other performance benefitsfrom a vegetarian leaning diet (beyond the antioxidant content) via our microbiome. Butantioxidant supplements? I'd avoid wasting my money.

If you want to increase your natural antioxidant intake "just in case", studies show benefits from

And if you would like a recipe to help you get started, I found this one shortly after.Substitute (or add) some cherries or grapes and you will be on your way.

Questions on content or suggestions to improve this page are appreciated.

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