Document Detail


Effects of low-level laser therapy (LLLT) in the development of exercise-induced skeletal muscle fatigue and changes in biochemical markers related to postexercise recovery.
MedLine Citation:
PMID:  20436237     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
STUDY DESIGN: Randomized crossover double-blinded placebo-controlled trial. OBJECTIVE: To investigate if low-level laser therapy (LLLT) can affect biceps muscle performance, fatigue development, and biochemical markers of postexercise recovery. BACKGROUND: Cell and animal studies have suggested that LLLT can reduce oxidative stress and inflammatory responses in muscle tissue. But it remains uncertain whether these findings can translate into humans in sport and exercise situations. METHODS: Nine healthy male volleyball players participated in the study. They received either active LLLT (cluster probe with 5 laser diodes; lambda = 810 nm; 200 mW power output; 30 seconds of irradiation, applied in 2 locations over the biceps of the nondominant arm; 60 J of total energy) or placebo LLLT using an identical cluster probe. The intervention or placebo were applied 3 minutes before the performance of exercise. All subjects performed voluntary elbow flexion repetitions with a workload of 75% of their maximal voluntary contraction force until exhaustion. RESULTS: Active LLLT increased the number of repetitions by 14.5% (mean +/- SD, 39.6 +/- 4.3 versus 34.6 +/- 5.6; P = .037) and the elapsed time before exhaustion by 8.0% (P = .034), when compared to the placebo treatment. The biochemical markers also indicated that recovery may be positively affected by LLLT, as indicated by postexercise blood lactate levels (P<.01), creatine kinase activity (P = .017), and C-reactive protein levels (P = .047), showing a faster recovery with LLLT application prior to the exercise. CONCLUSION: We conclude that pre-exercise irradiation of the biceps with an LLLT dose of 6 J per application location, applied in 2 locations, increased endurance for repeated elbow flexion against resistance and decreased postexercise levels of blood lactate, creatine kinase, and C-reactiveprotein. LEVEL OF EVIDENCE: Performance enhancement, level 1b.
Authors:
Ernesto Cesar Pinto Leal Junior; Rodrigo Alvaro Brandão Lopes-Martins; Lucio Frigo; Thiago De Marchi; Rafael Paolo Rossi; Vanessa de Godoi; Shaiane Silva Tomazoni; Daniela Perin Silva; Maira Basso; Pedro Lotti Filho; Francisco de Valls Corsetti; Vegard V Iversen; Jan Magnus Bjordal
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of orthopaedic and sports physical therapy     Volume:  40     ISSN:  0190-6011     ISO Abbreviation:  J Orthop Sports Phys Ther     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-16     Completed Date:  2010-11-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7908150     Medline TA:  J Orthop Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  524-32     Citation Subset:  IM    
Affiliation:
Center for Research and Innovation in Laser, Nove de Julho University (UNINOVE), São Paulo, SP, Brazil. ernesto.leal.junior@gmail.com
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Arm
Biological Markers / blood
C-Reactive Protein / analysis
Creatine Kinase / blood
Cross-Over Studies
Double-Blind Method
Exercise Test*
Humans
Lactic Acid / blood
Laser Therapy, Low-Level*
Male
Muscle Fatigue*
Muscle, Skeletal / radiation effects*
Physical Exertion
Recovery of Function
Young Adult
Chemical
Reg. No./Substance:
0/Biological Markers; 50-21-5/Lactic Acid; 9007-41-4/C-Reactive Protein; EC 2.7.3.2/Creatine Kinase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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