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NASA have researched the advantages of using light therapy in space. Due to the fact that astronauts do not have access to extensive medical care when in space, light therapy would enable them to access some health care to improve quality of life in space (Whelan et al., 2001). Whelan et al., (2001) highlights the importance of LEDs on humans. It is discussed that users of LED therapy saw a 40% improvement in musculoskeletal injuries in navy seal participants. Not only did the review see benefits in healing musculosketal injuries the review also stated that the US Salt Lake City submarine crew saw a 50% faster healing rate in wounds (7days) compared to the 14-day average that the control group experienced. This evidence further suggests to us that Light therapy is beneficial for all living tissues and would indicate the beneficial use to astronauts in space, but also for animals on earth. Laser therapy was first used in 1963 (Choy, 1988) and has since been a vital piece of veterinary and human medicine. Laser therapy is often confused with light therapy when discussing light therapy due to its popularity however they are not the same. An article was written debating whether light or laser therapy was more beneficial and through the pros and cons were weighted for each argument. It was concluded that light therapy is more beneficial than laser therapy as it had only one disadvantage according to the study, which were less precise wavelengths. When compared to the disadvantages caused by laser therapy which were: potential eye hazards to both the patient/client and the practitioner, the higher costs of devices, the fact that laser therapy cannot be used on the whole body and then the most important factor, Laser therapy was responsible for causing an unnatural response in the body (Starwynn, n.d.). It seems that the use of light therapy is safer and has better outcomes for both practioners and animals. Further investigating the comparisons between LED and Laser were Chaves et al., (2014), they concluded that the light therapy is as effective as laser therapy since they both have similar biological effects, with the differences being non-significant (Chaves et al., 2014). According to Karu (2008) the property of coherence is lost during the process of interaction of light with body tissue this not being a prerequisite for the process of photostimilation or photoinhibitation. 7PDF Image | THE EFFECT OF LIGHT THERAPY ON HEART RATE, HORSES
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