Clinical trial NCT02474602: Phototherapy Applied in Association With Strength Training
Official title: Phototherapy Applied in Association of Muscle Training: Evaluation of Different Irradiation Protocols
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Muscle Development in Association to Phototherapy
Keywords: phototherapy
strength training
photobiostimulation
muscle development
Lead sponsor: University of Nove de Julho
Sponsor class: OTHER
Collaborators: name: Fundação de Amparo à Pesquisa do Estado de São Paulo
First posted: 2015-06-18
Enrollment: 48
Sex: MALE
Minimum age (years): 18
Maximum age (years): 35
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: SINGLE_GROUP
Primary purpose: SUPPORTIVE_CARE

Brief summary: The effects of phototherapy has been widely studied by some research groups. The investigators know that there are positive results with light application to improve muscle performance and delay fatigue. However, there are few studies showing its´ effects on muscular training. Therefore, the aim of this study was to assess the effects of phototherapy applied at different times during 12 weeks of strength training. For such, 48 volunteers, healthy male, from 18 to 35 years old were recruited to perform a strength training protocol for the anterior muscle of the thigh development. Volunteers performed the training protocol twice a week for 12 weeks. There were assessed isometric peak torque in isokinetic dynamometer, 1-repetition maximum test in the leg extension and leg press machines and bilateral thigh perimetry.

Detailed description: This is a clinical, randomized, controlled placebo and double-blind study. Forty-eight participants performed strength training protocol. Subjects practiced a protocol training with 80% of the load, measured through 1-repetition maximum test. The training protocol consisted in performing 5 sets of 10 repetitions, twice a week, employing leg extension and leg press machines.

Phototherapy, active or placebo, were applied in 6 different points of anterior muscle of the thigh before and after each training session. Only one investigator, that did not participate in any phase of the assessments and trainings sessions, knew about what program is active or placebo in phototherapy device. Randomisation carried out by a simple drawing of lots (A, B, C, or D) in the first visit. The phototherapy unit emitted the same sound regardless of the program used, active or placebo. Either strength training lasted 12 weeks and assessments were performed at baseline, 4, 8 and 12 weeks. There were evaluated maximal voluntary contraction (MVC), bilateral thigh perimetry and 1-repetition maximum test (1-RM).

Eligibility criteria: Inclusion Criteria:

There were included in the study

* healthy individuals,
* active,
* aged between 18 and 35 years old,
* male,
* presenting no history of musculoskeletal injury in the regions of the hip and knee in the two months prior to the study.
* that are not making use of pharmacological agents and / or nutritional supplements, and
* that have at least 80% of attendance to training.

Exclusion Criteria:

The participants were excluded if they

* present some musculoskeletal injury during the study

Primary outcomes:
measure: Maximum voluntary contraction in the isokinetic dynamometer (MVC)
timeFrame: 12 weeks
Secondary outcomes:
measure: 1-Repetition Maximum test in the leg press and leg extension machines (1-RM)
timeFrame: 12 weeks
measure: Thigh perimetry
timeFrame: 12 weeks
Other outcomes:
Locations:
city: São Paulo
country: Brazil
facility: Nove de Julho University
state: SP
Study officials:
affiliation: University of Nove de Julho
name: Ernesto Cesar P Leal Junior, PhD
role: STUDY_DIRECTOR
References:
citation: Leal-Junior EC, Vanin AA, Miranda EF, de Carvalho Pde T, Dal Corso S, Bjordal JM. Effect of phototherapy (low-level laser therapy and light-emitting diode therapy) on exercise performance and markers of exercise recovery: a systematic review with meta-analysis. Lasers Med Sci. 2015 Feb;30(2):925-39. doi: 10.1007/s10103-013-1465-4. Epub 2013 Nov 19.
citation: Seynnes OR, de Boer M, Narici MV. Early skeletal muscle hypertrophy and architectural changes in response to high-intensity resistance training. J Appl Physiol (1985). 2007 Jan;102(1):368-73. doi: 10.1152/japplphysiol.00789.2006. Epub 2006 Oct 19.
citation: Antonialli FC, De Marchi T, Tomazoni SS, Vanin AA, dos Santos Grandinetti V, de Paiva PR, Pinto HD, Miranda EF, de Tarso Camillo de Carvalho P, Leal-Junior EC. Phototherapy in skeletal muscle performance and recovery after exercise: effect of combination of super-pulsed laser and light-emitting diodes. Lasers Med Sci. 2014 Nov;29(6):1967-76. doi: 10.1007/s10103-014-1611-7. Epub 2014 Jun 19.