【最新2019】雅思阅读的真题机经：磁疗word版本 (2页)

【最新2019】雅思阅读的真题机经：磁疗word版本

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雅思阅读的真题机经：磁疗

Magnet Therapy

Magnet therapy , magnetic therapy , or magnotherapy is an alternative medicine practice involving the use of static magnetic fields . Practitioners claim that subjecting certain parts of the

body to magnetostatic fields produced by permanent magnets has beneficial health effects . These pseudoscientific physical and biological claims are unproven and no effects on health or healing have been established . Although hemoglobin , the blood protein that carries oxygen , is weakly diamagnetic and is repulsed by magnetic fields , the magnets used in magnetic therapy are many orders of magnitude too weak to have any measurable effect on blood flow .

Methods of application

Magnet therapy is the application of the magnetic field of electromagnetic devices or permanent static magnets to the body for purported health benefits . Some practitioners assign different

effects based on the orientation of the magnet ; under the laws of physics , magnetic poles are symmetric .

Products include magnetic bracelets and jewelry ; magnetic

straps for wrists , ankles , knees , and the back ; shoe insoles ; mattresses ; magnetic blankets ; magnetic creams ; magnetic supplements ; plasters / patches and water that has been magnetized . Application is usually performed by the patient .

Purported mechanisms of action

Perhaps the most common suggested mechanism is that magnets

might improve blood flow in underlying tissues . The field

surrounding magnet therapy devices is far too weak and falls off with distance far too quickly to appreciably affect hemoglobin , other blood components , muscle tissue , bones , blood vessels , or organs .

A 1991 study on humans of static field strengths up to 1 T found no