title: Immediate effects of low-intensity laser (808 nm) on fatigue and strength of spastic muscle.
abstract: The cerebrovascular accident (CVA), high-impact disease II, affects the basic functions of the limbs, leading to changes of sensory, language, and motor functions. The search for resources that minimize the damage caused by this disease grows every day. The clinical use of low-intensity laser therapy (LILT) has provided major breakthroughs in the treatment of muscular disorders and prevention of muscle fatigue. Thus, the objective of the present study is to analyze the answers and immediate adaptations of the rectus femoris and vastus medialis of spastic hemiparetic patients, facing the increase in peak torque and triggering muscle fatigue, after application of LILT. Double-blind clinical trials were conducted with 15 volunteers post-CVA with spasticity, of both genders, between 40 and 80 years old. To this end, the volunteers went through three consecutive stages of rating (control, placebo, and laser). All performed tests of isometric contraction on the patient's hemiparetic side. Significant differences were observed with regard to the increase in muscle performance (p = 0.0043) and the reduction in blood lactate concentration (p < 0.0001) of the post-LILT muscles. The LILT (diode laser, l100 mW 808 nm, 4.77 J/cm(2)/point, 40 s/AP) can be employed during and after spastic muscle-strengthening exercises, contributing to the improvement of motor function of the patient. After application of LILT, we found increased torque as well as decreased in lactate level in patients with spasticity.
authors.affiliation: Laboratório de Engenharia de Reabilitação Sensório Motora, Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, Urbanova, SP, 12244-000, Brazil, mah.crr@gmail.com.
authors.forename: Mariana César Ribeiro
authors.initials: MC
authors.lastname: dos Reis
authors.forename: Eliana Aparecida Fonseca
authors.initials: EA
authors.lastname: de Andrade
authors.forename: Ana Carolina Lacerda
authors.initials: AC
authors.lastname: Borges
authors.forename: Djenifer Queiroz
authors.initials: DQ
authors.lastname: de Souza
authors.forename: Fernanda Pupio Silva
authors.initials: FP
authors.lastname: Lima
authors.forename: Renata Amadei
authors.initials: RA
authors.lastname: Nicolau
authors.forename: Adriano Oliveira
authors.initials: AO
authors.lastname: Andrade
authors.forename: Mário Oliveira
authors.initials: MO
authors.lastname: Lima
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D054023:Lasers, Semiconductor / Q000627:therapeutic use*; D028022:Low-Level Light Therapy; D008297:Male; D008875:Middle Aged; D009128:Muscle Spasticity / Q000097:blood / Q000532:radiotherapy*; D053580:Muscle Strength; D052097:Quadriceps Muscle / Q000503:physiopathology / Q000528:radiation effects; D020521:Stroke / Q000503:physiopathology
chemical_list: D019344:Lactic Acid