For the study, researchers at the University of Ulster and University of Limerick in Ireland reviewed almost three dozen earlier studies of the effects of using ice to combat sore muscles, a practice that many who exercise often employ. Ice is, after all, the “I” in the acronym RICE (rest, ice, compression, elevation), which remains the standard first-aid protocol for dealing with a sports-related injury. Icing is also widely used to deal with muscles that twinge but aren’t formally injured. Watch almost any football, basketball or soccer game, at any level, and you’ll likely see many of the players icing body parts during halftime, preparing to return to play
But there has been surprisingly little science to support the practice. A
2004 review of icing-related studies published to that point concluded that while cold packs did seem to reduce pain in injured tissues, icing’s overall effects on sore muscles had “not been fully elucidated” and far more study was needed.
Last year,
a small-scale randomized trial found no discernible benefits from icing leg muscle tears. The cooled muscles did not heal faster or feel less painful than the untreated tissues. But, as the researchers point out, it is difficult to scientifically study icing, since you can’t blind people to whether they are receiving the therapy or a placebo. People generally can tell if their muscles are getting cold or not.
Which leaves the findings of the new review about icing by athletes as the best overview we may have for now. And the findings are not altogether comforting
The authors write that, in a majority of the studies they looked at, icing was quite effective at numbing soreness. But it also significantly reduced muscle strength and power for up to 15 minutes after the icing had ended. It also tended to lessen fine motor coordination. Some of the reviewed studies found that people experienced impaired limb proprioception, or their sense of where their limb was in space after it had been iced
The result was frequently, at least in the short term, poorer athletic performance. Volunteers were not able to jump as high, sprint as fast, or throw or strike a ball as well after 20 minutes of icing
“The current evidence base suggests that the performance of athletes will probably be adversely affected should they return to activity immediately after cooling,” the authors conclude.
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