Abstract: This study evaluates different wavelengths of LED therapy in Wistar rats skin injuries. LEDs (Light Emitting Diodes) are phototherapeutic resource nowadays, since it is considered a good alternative to Low Level Laser Therapy in injury healing because of the lower cost. Twenty-five male Wistar rats were divided in five groups: Control, Red LED (630-780 nm), Green LED (490-565 nm), Blue LED (440-490 nm) and Yellow LED (590-630 nm). It´s a experimental research that it was performed during 4 weeks. Twenty-four hours after surgical injury (1cm²) was applied LED therapy for 6 minutes during five days. Red LED presented best anti-edematous effects in comparison to the other wavebands. The perimeters were reduced in all groups, but in Green and Red LED groups were significantly diminished (p<0,05) when compared to control and Blue LED groups. The best result of area was with Green LED and worst results with Blue LED. The use of non collimated phototherapy with Red, Green, Yellow and Blue LEDs improves the wounds healing process, mainly with Red wavelength. The non collimated phototherapy with LEDs could be included in Physiotherapy practice for wound healing improvement because of the lower cost in comparison with Low Level Laser Therapy and the benefits of irradiate a bigger area.
Keywords: Phototherapy, wound healing, LED, Physiotherapy, Wistar rat.