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Researchers Say Stretching Before or After Exercise Has Little or No Effect on Soreness

Oct. 17, 2007 -- Stretching before or after vigorous exercise won't spare you the agony of sore muscles, according to a new review.

Researchers from the University of Sydney in Australia arrived at the conclusion after reviewing the results of 10 published studies.

The review "showed very clear results that stretching is not effective in avoiding muscle soreness," says study researcher Marcos de Noronha, a PhD candidate at the university. The study is published in the latest issue of The Cochrane Database of Systemic Reviews.

Debates about what stretching can or can't do have gone on for years; advocates claim it not only reduces muscle soreness but also improves performance and reduces injury risk.

The Australian researchers focused only on the ability of stretching to reduce soreness. And if your only reason to stretch is to avoid soreness, de Noronha says the review proves "you don't need to go through the hassle because it does not actually work."

"However, if you stretch because you feel good when you do so, then go for it since there is no evidence that stretching before or after exercise is harmful," he says.

While de Noronha says this review should lay to rest the long-running debate about the effect of stretching the major muscle groups on muscle soreness, another expert tells WebMD he still believes it works and that the debate is not over yet.

A Closer Look at the Study

The Sydney researchers focused on what is known as delayed-onset muscle soreness, which usually occurs within the first day after extensive exercise and then peaks at about 48 hours. Nine of the studies were done in laboratory settings in which participants came in and exercised and then reported how sore they were later; one study looked at football players who reported their soreness after playing.

Three studies zeroed in on pre-exercise stretching, while the others assessed post-exercise stretching. Six studies compared participants assigned randomly to either stretch or not.

Participants stretched for 40 seconds to 600 seconds per session. De Noronha and researcher Robert Herbert, PhD, a senior research fellow at the university, used a 100-point scale to assess stiffness after exercise.

Pre-exercise stretching reduced soreness one day after exercise by, on average, less than 0.5 on a 100-point scale. Post-exercise stretching reduced soreness a day later by 1 point." Similar effects were evident between half a day and three days after exercise," the researchers write.

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