Muscle Development in Association to Phototherapy Clinical Trial
Official title:
Phototherapy Applied in Association of Muscle Training: Evaluation of Different Irradiation Protocols
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.
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).
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Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Supportive Care