Acute Effect of Photobiomodulation with LED in Apparatus on Power in Hip Muscles in Classical Ballerinas

Classical Ballet generates mechanical stress on the musculoskeletal structure, with the hip joint being one of the most requested. This study aimed to evaluate the acute effect of photobiomodulation on the hip abductor muscles in classical dancers using a Light Emitting Diode (LED) device at a wavelength of 850 nm (infrared). Twenty-three classical dancers aged 18 and 30 participated in two days: the control group (CG), without LED irradiation, and the Infrared Group (GI), with one week between collections. The participants evaluated the power in the concentric phase of the abductor and adductor muscles in the Isokinetic Dynamometer, performing 05 repetitions of abduction and adduction of the hip with an amplitude of 30 degrees and angular velocity of 120°/s. Data processing using Matlab software showed significant improvement (p < 0.05) in the power of the abductor muscles of the right and left lower limbs with Infrared LED intervention. Most of the literary findings did not recommend a total delivered energy of 17.5 J and an energy density of 4.46 J/cm2, suggesting the reason why there was no increase in power also in the hip adductors. However, research has shown results effective with a density of 5 J/cm2 but in muscle groups with a smaller area. It was concluded that even with a significant result with infrared LED on muscle power, further studies are necessary with variation in parameters for irradiation, such as the area of coverage of the LED apparatus or an increase in photobiomodulation sessions.