Photobiomodulation Therapy in a Field Test With High-level Rugby Players

University of Nove de Julho

Status: Completed

Conditions: Performance; High-level Rugby Athletes; Recovery

Treatments: Device: Photobiomodulation therapy (Phototherapy)

Study type: Interventional

Funder types: Other; Industry

Identifiers

NCT02588768

CEP-665.347

Details and patient eligibility

About

Background/Aim: While growing evidence supports the use of photobiomodulation therapy (PBMT) for performance and recovery enhancement, there have only been laboratory-controlled studies. Therefore, the aim of this study was to analyze the effects of PBMT in performance and recovery of high-level rugby players during an anaerobic field test.

Methods: It is a randomized, crossover, double-blinded, placebo-controlled trial. Twelve male high-level rugby athletes were recruited in this study. No intervention was performed before the Bangsbo Sprint Test (BST) at familiarization phase (week 1). At weeks 2 and 3, pre-exercise PBMT or placebo were randomly applied to each athlete. PBMT/placebo irradiation was performed at 17 sites of each lower limb, employing a cluster with 12 diodes (4 laser diodes of 905nm, 4 LED diodes of 875nm, and 4 LED diodes of 640nm, 30J per site - manufactured by Multi Radiance Medical™). Average time of sprints, best time of sprints, and fatigue index were obtained from BST. Blood lactate levels were assessed at baseline, and at 3, 10, 30 and 60 minutes after BST. Athletes' perceived fatigue was also assessed through a questionnaire.

Full description

All exercise tests were conducted in an enclosed soccer/rugby field. The three test phases, administered one week apart, were performed on the same day of the week (Tuesday) and time (1-5pm). The average temperature inside the building during the trials ranged from 26°C to 28°C. At first stage (exercise test 1) all athletes performed the Bangsbo Sprint Test (BST) to familiarization with the procedure. No interventions or comparators were applied before this test. However, at the second and third stages (exercise tests 2 and 3, respectively) either a placebo or active PBMT was applied according to randomization. Blood samples were collected from the athlete's fingertips prior to stretching and warming-up (baseline), and at 3, 10, 30 and 60 minutes after BST at each of the three study stages/phase (exercise tests). After blood sample collection (to establish baseline), a warm-up comprised of low-intensity activities such as dynamic stretches and low-intensity short running were performed by each athlete. Following the warm-up and cool down period, either the active or placebo comparator was applied to the athlete according to the randomization procedure for the second test. For the third test, the other comparator was utilized to complete the cross over design. A quick perception of fatigue survey was administered following each test.

Enrollment: 12 patients

Sex: Male

Ages: 18 to 35 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• high-level athletes from São José Rugby Club (Brazil)

Exclusion criteria

• Athlete would be excluded if the participant presented any skeletal muscle injury
• if athlete took any nutritional supplement or pharmacological agent
• if the athlete presented signs and symptoms of any disease (i.e., neurological, inflammatory, pulmonary, metabolic, oncologic), and
• if the athlete had history of cardiac arrest that could limit performance of high-intensity exercises

Trial design

Primary purpose: Health Services Research

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Triple Blind

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12 participants in 2 patient groups, including a placebo group

Active PBMT

Active Comparator group

Description:

Active PBMT was applied employing MR4 Laser Therapy Systems outfitted with LaserShower 50 4D emitters (both manufactured by Multi Radiance Medical, Solon - OH, USA). The cluster style emitter contains 12 diodes comprising of four super-pulsed laser diodes (905 nm, 0.3125 mW average power, and 12.5 W peak power for each diode), four red LED diodes (640 nm, 15 mW average power for each diode), and four infrared LEDs diodes (875 nm, 17.5 mW average power for each diode).

Treatment:

Device: Photobiomodulation therapy (Phototherapy)

Placebo PBMT

Placebo Comparator group

Description:

Placebo PBMT was applied using the same device that emitted the same sounds and light, but with no effective irradiation.

Treatment:

Device: Photobiomodulation therapy (Phototherapy)