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【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
