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Effects of low level laser therapy (808 nm) on physical strength training in humans. 2011

Cleber Ferraresi, and Taysa de Brito Oliveira, and Leonardo de Oliveira Zafalon, and Rodrigo Bezerra de Menezes Reiff, and Vilmar Baldissera, and Sérgio Eduardo de Andrade Perez, and Euclides Matheucci Júnior, and Nivaldo Antônio Parizotto
Laboratory of Electrothermophototherapy, Department of Physical Therapy, Federal University of São Carlos, Rodovia Washington Luís, km 235, 13565-905, São Carlos, SP, Brazil. cleber.ferraresi@gmail.com

Recent studies have investigated whether low level laser therapy (LLLT) can optimize human muscle performance in physical exercise. This study tested the effect of LLLT on muscle performance in physical strength training in humans compared with strength training only. The study involved 36 men (20.8±2.2 years old), clinically healthy, with a beginner and/or moderate physical activity training pattern. The subjects were randomly distributed into three groups: TLG (training with LLLT), TG (training only) and CG (control). The training for TG and TLG subjects involved the leg-press exercise with a load equal to 80% of one repetition maximum (1RM) in the leg-press test over 12 consecutive weeks. The LLLT was applied to the quadriceps muscle of both lower limbs of the TLG subjects immediately after the end of each training session. Using an infrared laser device (808 nm) with six diodes of 60 mW each a total energy of 50.4 J of LLLT was administered over 140 s. Muscle strength was assessed using the 1RM leg-press test and the isokinetic dynamometer test. The muscle volume of the thigh of the dominant limb was assessed by thigh perimetry. The TLG subjects showed an increase of 55% in the 1RM leg-press test, which was significantly higher than the increases in the TG subjects (26%, P = 0.033) and in the CG subjects (0.27%, P < 0.001). The TLG was the only group to show an increase in muscle performance in the isokinetic dynamometry test compared with baseline. The increases in thigh perimeter in the TLG subjects and TG subjects were not significantly different (4.52% and 2.75%, respectively; P = 0.775). Strength training associated with LLLT can increase muscle performance compared with strength training only.

UI MeSH Term Description Entries
D008297 Male Males
D008954 Models, Biological Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment. Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293 Adolescent A person 13 to 18 years of age. Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths
D052097 Quadriceps Muscle The quadriceps femoris. A collective name of the four-headed skeletal muscle of the thigh, comprised of the rectus femoris, vastus intermedius, vastus lateralis, and vastus medialis. Quadriceps Femoris,Rectus Femoris,Vastus Intermedius,Vastus Lateralis,Vastus Medialis,Muscle, Quadriceps,Muscles, Quadriceps,Quadriceps Muscles
D053580 Muscle Strength The amount of force generated by MUSCLE CONTRACTION. Muscle strength can be measured during isometric, isotonic, or isokinetic contraction, either manually or using a device such as a MUSCLE STRENGTH DYNAMOMETER. Arthrogenic Muscle Inhibition,Arthrogenic Muscle Inhibitions,Inhibition, Arthrogenic Muscle,Muscle Inhibition, Arthrogenic,Strength, Muscle
D053581 Muscle Strength Dynamometer A device that measures MUSCLE STRENGTH during muscle contraction, such as gripping, pushing, and pulling. It is used to evaluate the health status of muscle in sports medicine or physical therapy. Dynamometer, Muscle Strength,Dynamometers, Muscle Strength,Muscle Strength Dynamometers
D055070 Resistance Training A type of strength-building exercise program that requires the body muscle to exert a force against some form of resistance, such as weight, stretch bands, water, or immovable objects. Resistance exercise is a combination of static and dynamic contractions involving shortening and lengthening of skeletal muscles. Strength Training,Weight-Bearing Strengthening Program,Weight-Lifting Strengthening Program,Weight-Bearing Exercise Program,Weight-Lifting Exercise Program,Exercise Program, Weight-Bearing,Exercise Program, Weight-Lifting,Exercise Programs, Weight-Bearing,Exercise Programs, Weight-Lifting,Strengthening Program, Weight-Bearing,Strengthening Program, Weight-Lifting,Strengthening Programs, Weight-Bearing,Strengthening Programs, Weight-Lifting,Training, Resistance,Training, Strength,Weight Bearing Exercise Program,Weight Bearing Strengthening Program,Weight Lifting Exercise Program,Weight Lifting Strengthening Program,Weight-Bearing Exercise Programs,Weight-Bearing Strengthening Programs,Weight-Lifting Exercise Programs,Weight-Lifting Strengthening Programs
D055815 Young Adult A person between 19 and 24 years of age. Adult, Young,Adults, Young,Young Adults
D028022 Low-Level Light Therapy Treatment using irradiation with light of low power intensity so that the effects are a response to the light and not due to heat. A variety of light sources, especially low-power lasers are used. LLLT,Laser Biostimulation,Laser Irradiation, Low-Power,Laser Therapy, Low-Level,Photobiomodulation,Laser Phototherapy,Laser Therapy, Low-Power,Low-Level Laser Therapy,Low-Power Laser Irradiation,Low-Power Laser Therapy,Photobiomodulation Therapy,Biostimulation, Laser,Irradiation, Low-Power Laser,Laser Irradiation, Low Power,Laser Therapies, Low-Level,Laser Therapies, Low-Power,Laser Therapy, Low Level,Laser Therapy, Low Power,Light Therapies, Low-Level,Light Therapy, Low-Level,Low Level Laser Therapy,Low Level Light Therapy,Low Power Laser Irradiation,Low Power Laser Therapy,Low-Level Laser Therapies,Low-Level Light Therapies,Low-Power Laser Therapies,Photobiomodulation Therapies,Photobiomodulations,Phototherapy, Laser,Therapies, Low-Level Light,Therapies, Photobiomodulation,Therapy, Low-Level Light,Therapy, Photobiomodulation

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