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present in ATP molecules. This inner membrane is very sensitive to light, and stimulating it with certain wavelengths of light causes it to accelerate its activity making more energy available to the cell (Johnson, 2003). One theory that attempts to explain effects of LT is that when an injury occurs, the energy state of a cell is changed which alters the electromagnetic communication between cells. LT is thought to influence this communication favorably (de Bie, 1998). Light in the electromagnetic spectrum has a well- established role in medicine. Sunlight was used by the ancient Greeks to heal and strengthen (Basford, 1999). The use of laser irradiation to speed wound healing in the human first appeared in literature in 1971 (Moore, 2005). In present day ultraviolet and visible light are used as bactericidal agents as well as for treatment of psoriasis and mood disorders. Short wave diathermy, which uses a longer wavelength portion of the electromagnetic spectrum, is a common physical therapy modality (Basford, 1999). LT is based on the belief that laser irradiation is able to alter cellular and tissue function in a manner dependent on the characteristics of light itself. Initial work began in Europe some thirty years ago, but with poor results. However, this did not stop the attention that LT received. Europe and the Soviet Union have continued to work with this concept and interest has spread, research has continued, and clinical use has grown (Basford, 1999). As a result of the interest in LT, the US Food and Drug Administration gave its approval for LT to be used in the clinical setting in 2002 for use on many types of injuries and conditions. There are many different types of lasers that the medical community uses. I focused my research on lasers that used low energy or energy that had no heating effect 8PDF Image | Light Therapy on Pain and Swelling vs Collegiate Athletes
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