Journal
PHYSIOTHERAPY THEORY AND PRACTICE
Volume 31, Issue 5, Pages 354-361Publisher
TAYLOR & FRANCIS INC
DOI: 10.3109/09593985.2014.1003118
Keywords
Fatigue; LEDT; LLLT; muscle damage; NMR; oxygen uptake; photobiomodulation
Categories
Funding
- NIAID NIH HHS [R01AI050875, R01 AI050875] Funding Source: Medline
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Recently, low-level laser (light) therapy (LLLT) has been used to improve muscle performance. This study aimed to evaluate the effectiveness of near-infrared light-emitting diode therapy (LEDT) and its mechanisms of action to improve muscle performance in an elite athlete. The kinetics of oxygen uptake (VO2), blood and urine markers of muscle damage (creatine kinase - CK and alanine), and fatigue (lactate) were analyzed. Additionally, some metabolic parameters were assessed in urine using proton nuclear magnetic resonance spectroscopy (H-1 NMR). A LED cluster with 50 LEDs (lambda = 850 nm; 50 mW 15s; 37.5J) was applied on legs, arms, and trunk muscles of a single runner athlete 5 min before a high-intense constant workload running exercise on treadmill. The athlete received either Placebo-1-LEDT; Placebo-2-LEDT; or Effective-LEDT in a randomized double-blind placebo-controlled trial with washout period of 7 d between each test. LEDT improved the speed of the muscular VO2 adaptation (similar to-9 s), decreased O-2 deficit (similar to-10 L), increased the VO2 from the slow component phase (similar to+348 ml min(-1)), and increased the time limit of exercise (similar to+589 s). LEDT decreased blood and urine markers of muscle damage and fatigue (CK, alanine and lactate levels). The results suggest that a muscular pre-conditioning regimen using LEDT before intense exercises could modulate metabolic and renal function to achieve better performance.
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