| Full text | |
| Author(s): |
Pinto Leal Junior, Ernesto Cesar
[1, 2]
;
Brandao Lopes-Martins, Rodrigo Alvaro
[3]
;
Rossi, Rafael Paolo
;
De Marchi, Thiago
;
Baroni, Bruno Manfredini
;
De Godoi, Vanessa
;
Marcos, Rodrigo Labat
[3]
;
Ramos, Luciano
[3]
;
Bjordal, Jan Magnus
[1, 4]
Total Authors: 9
|
| Affiliation: | [1] Univ Bergen, Sect Physiotherapy Sci, Dept Publ Hlth & Primary Hlth Care, N-5009 Bergen - Norway
[2] UCS, LMH, Sports Med Inst IME, BR-95070560 Caxias Do Sul, RS - Brazil
[3] Univ Sao Paulo, Dept Pharmacol, Lab Pharmacol & Expt Therapeut, Inst Biomed Sci, BR-05508000 Sao Paulo - Brazil
[4] Bergen Univ Coll, Inst Phys Therapy, N-5009 Bergen - Norway
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Lasers in Surgery and Medicine; v. 41, n. 8, p. 572-577, OCT 2009. |
| Web of Science Citations: | 82 |
| Abstract | |
Background and Objectives: There are some indications that low-level laser therapy (LLLT) may delay the development of skeletal muscle fatigue during high-intensity exercise. There have also been claims that LED cluster probes may be effective for this application however there are differences between LED and laser sources like spot size, spectral width, power output, etc. In this study we wanted to test if light emitting diode therapy (LEDT) can alter muscle performance, fatigue development and biochemical markers for skeletal muscle recovery in an experimental model of biceps humeri muscle contractions. Study Design/Materials and Methods: Ten male professional volleyball players (23.6 {[}SD +/- 5.6] years old) entered a randomized double-blinded placebo-controlled crossover trial. Active cluster LEDT (69 LEDs with wavelengths 660/850 nm, 10/30 mW, 30 seconds total irradiation time, 41.7J of total energy irradiated) or an identical placebo LEDT was delivered under double-blinded conditions to the middle of biceps humeri muscle immediately before exercise. All subjects performed voluntary biceps humeri contractions with a workload of 75% of their maximal voluntary contraction force (MVC) until exhaustion. Results: Active LEDT increased the number of biceps humeri contractions by 12.9% (38.60 {[}SD +/- 9.03] vs. 34.20 {[}SD +/- 8.68], P = 0.021) and extended the elapsed time to perform contractions by 11.6% (P = 0.036) versus placebo. In addition, post-exercise levels of biochemical markers decreased significantly with active LEDT: Blood Lactate (P = 0.042), Creatine Kinase (P = 0.035), and C-Reative Protein levels (P = 0.030), when compared to placebo LEDT. Conclusion: We conclude that this particular procedure and dose of LEDT immediately before exhaustive biceps humeri contractions, causes a slight delay in the development of skeletal muscle fatigue, decreases post-exercise blood lactate levels and inhibits the release of Creatine Kinase and C-Reative Protein. Lasers Surg. Med. 41:572-577, 2009. (C) 2009 Wiley-Liss, Inc. (AU) | |
| FAPESP's process: | 05/02117-6 - Effect of therapies of inhaled nitric oxide and low power laser on the experimental model fo tendonitis induced by collagenase in rats |
| Grantee: | Rodrigo Alvaro Brandão Lopes Martins |
| Support Opportunities: | Regular Research Grants |