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Physiotherapy Theory and Practice
An International Journal of Physical Therapy
Volume 31, 2015 - Issue 5
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Single Subject Research Report

Muscular pre-conditioning using light-emitting diode therapy (LEDT) for high-intensity exercise: a randomized double-blind placebo-controlled trial with a single elite runner

Cleber FerraresiDepartment of Physical Therapy, Laboratory of Electrothermophototherapy, Federal University of São Carlos, São Paulo, Brazil, ;Post-Graduation Program in Biotechnology, Federal University of São Carlos, São Paulo, Brazil, ;Optics Group, Physics Institute of São Carlos, University of São Paulo, São Carlos, Brazil, ;Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA, Correspondence[email protected]
, PhD,
Thomas BeltrameLaboratory of Cardiovascular Physical Therapy, Nucleus of Research in Physical Exercise, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil, ;Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario, Canada,
, MSc,
Fernando FabrizziLaboratory of Biochemical Adaptive, Department of Genetic and Evolution, Federal University of São Carlos, São Carlos, São Paulo, Brazil,
, MSc,
Eduardo Sanches Pereira do NascimentoLaboratory of Inorganic and Analytical Chemistry, Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, Brazil,
, PhD,
Marlus KarstenLaboratory of Cardiovascular Physical Therapy, Nucleus of Research in Physical Exercise, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil,
, PhD,
Cristina de Oliveira FranciscoLaboratory of Cardiovascular Physical Therapy, Nucleus of Research in Physical Exercise, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil,
, MSc,
Audrey Borghi-SilvaLaboratory of Cardiovascular Physical Therapy, Nucleus of Research in Physical Exercise, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil,
, PhD,
Aparecida Maria CataiLaboratory of Cardiovascular Physical Therapy, Nucleus of Research in Physical Exercise, Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil,
, PhD,
Daniel Rodrigues CardosoLaboratory of Inorganic and Analytical Chemistry, Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, Brazil,
, PhD,
Antonio Gilberto FerreiraLaboratory of Nuclear Magnetic Resonance, Department of Chemistry, Federal University of São Carlos, São Carlos, Brazil,
, PhD,
Michael R. HamblinWellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA, ;Department of Dermatology, Harvard Medical School, Boston, MA, USA, and ;Harvard–MIT Division of Health Science and Technology, Cambridge, MA, USA
, PhD,
Vanderlei Salvador BagnatoPost-Graduation Program in Biotechnology, Federal University of São Carlos, São Paulo, Brazil, ;Optics Group, Physics Institute of São Carlos, University of São Paulo, São Carlos, Brazil,
, PhD &
Nivaldo Antonio ParizottoDepartment of Physical Therapy, Laboratory of Electrothermophototherapy, Federal University of São Carlos, São Paulo, Brazil, ;Post-Graduation Program in Biotechnology, Federal University of São Carlos, São Paulo, Brazil,
, PhD show all
Pages 354-361 | Received 23 Jun 2014, Accepted 27 Oct 2014, Published online: 14 Jan 2015
 
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Abstract

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 (1H NMR). A LED cluster with 50 LEDs (λ = 850 nm; 50 mW 15 s; 37.5 J) 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 (∼−9 s), decreased O2 deficit (∼−10 L), increased the VO2 from the slow component phase (∼+348 ml min−1), and increased the time limit of exercise (∼+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.

Acknowledgments

The authors would like to thank the runner athlete who participated of this initial research and all universities and departments involved.

Declaration of interest

The authors declare have no conflict of interest. Cleber Ferraresi would like to thank FAPESP for his PhD’s degree scholarship (number 2010/07194-7). M. R. Hamblin was supported by US NIH grant R01AI050875.

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