Maybe you've seen plastic "performance-boosting" bracelets (with brand names Power Balance, EFX, iRenew, Trion:Z, and others) being sold at fitness events or worn by pro and amateur athletes. The manufacturers claim that the bracelets are programmed with special energy frequencies to improve strength, flexibility, and balance. Salespeople will "test" your balance without and then wearing the bracelet to demonstrate these claims.
Exercise scientists from the American Council on Exercise created tests using the Power Balance and sham bracelets in randomized trials. Subjects performed two tests each of flexibility, balance, strength, and jumping height. No benefit was found from the "performance" bracelets; rather, the researchers observed that subjects invariably did better on the second trial, regardless of which bracelet they were wearing, possibly due to the effects of muscular learning and warm-ups.
In addition, the Australian government has pressured the Australian Power Balance manufacturer to publicly admit that there is no scientific backing to their claims. In the U.S., we may see a similar outcome as several class action suits have been filed citing false advertising and unfair business practices.
Source: American Council on Exercise
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