Effect of Light-Emitting Diode on the Strenght and Resistence Capacities of Cycling Athletes

Summary

Phototherapy is a therapeutic resource of increasing use in the last decade. The photobiomodulatory effects are commonly produced by means of low intensity lasers or LED emitting diodes, and can be used at different wavelengths. These light sources are divergent as to coherence, but produce equivalent tissue effects. The application of laser or LED light is able to induce biochemical changes in tissues, allowing for inhibitory or stimulating effects. These responses are associated to a cascade of cellular reactions, which favor the absorption of enzymes by cytochrome c oxidase, generating physiological responses that lead to decreased production of reactive oxygen species and increased synthesis of adenosine triphosphate (ATP). The application of this therapeutic resource brings ergogenic and protective benefits in muscular performance. The use of LED as a light source is promising because of its low cost, but there are no enough studies that support this use in athletes, with a focus on performance improvement. In addition to the deficiency of the sample, there is also no consensus regarding the use of different wavelengths for LED in the literature, thus opening gaps for the best protocol for the application of this technique. Therefore, a study that evaluates the use of LED in athletes, with different wavelengths, to improve performance is necessary. Hypothesis: It is hypothesized that the LED application is capable of improving athletes performance in terms of increased fatigue resistance, increased strength and power, increased muscle recruitment, and optimized oxygen demand. It is also expected that the results generated in this study can contribute to and increase the resources used by physiotherapists within the clinical-sports field, contributing to the post-training recovery, as well as the more effective physical performance in competitive activities.

Conditions

• Athletes

Interventions

DEVICE

Light-Emitting Diode Device

The therapy will be applied on the second, third and fourth day of collection using a 25x40 cm2 LED blanket, with an equidistant distribution, with total energy per area of 180 J bilaterally on the quadriceps femoris muscle. All LEDs will be calibrated prior to the start of applications in the Laboratory of Photobiophysics of the Faculty of Sciences and Letters of Ribeirão Preto, University of São Paulo, in which the wavelengths will be checked, the angle of radiation, power and power density.

DEVICE

Sham Light-Emitting Diode Device

The Sham Light-Emitting Diode Device will be applied on the second, third and fourth day of collection using a 25x40 cm2 LED blanket, with an equidistant distribution, with total energy per area of 0 J bilaterally on the quadriceps femoris muscle. At the time of application the device will not be activated

Sponsors & Collaborators

• University of Sao Paulo

  lead OTHER

Principal Investigators

• Rinaldo RJ Roberto de Jesus Guirro, Dr · University of Sao Paulo

Study Design

Allocation

RANDOMIZED

Purpose

OTHER

Masking

TRIPLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

45 Years

Sex

MALE

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2018-01-25

Primary Completion

2018-12-25

Completion

2019-03-12

Countries

• Brazil

Study Locations