Muscle Strength Clinical Trial
Official title:
Effects of Photobiomodulation Therapy in Strength Training and Detraining in Humans
In last years it has been demonstrated that photobiomodulation therapy (PBMT) has ergogenic effects, improving muscular performance and accelerating post-exercise recovery. However, many aspects related to these effects and its' clinical applicability remain unknown. Therefore, the aim of this project is to evaluate the ergogenic effects of PBMT in detraining after a strength training protocol.
It will be carried out a randomized, triple-blind, placebo-controlled trial.
Forty-eight volunteers will be randomly allocated to four experimental groups:
1. PBMT before the strength training sessions and PBMT during the detraining period;
2. PBMT before the strength training sessions and placebo during the detraining period;
3. Placebo before the strength training sessions and PBMT during the detraining period;
4. Placebo before the strength training sessions and placebo during the detraining period .
The individuals randomly allocated to the different groups will be subjected to 12
consecutive weeks of dynamic strength training involving leg-press and knee extension
exercises in leg-press and leg-extension machines, respectively, 2 times a week.After the
12-week training period, the volunteers will receive the application of PBMT or placebo
depending on the group to which they are allocated for 4 weeks (2 times a week) without
training.
The data will be collected by a blind assessor. It will be analyzed the muscular strength and
the structural properties of quadriceps before starting the study (baseline), at 4, 8, and 12
weeks after starting the training period, and at 4 weeks after completing the training
(detraining period), in both lower limbs.
The findings will be tested for their normality using the Shapiro-Wilk test. Parametric data
will be expressed as mean and standard deviation and non-parametric data as median and
respective upper and lower limits. Parametric data will be analyzed by two-way repeated
measures analysis of variance (ANOVA; time versus experimental group) with post-hoc
Bonferroni correction. Non-parametric data will be analyzed using the Friedman test and,
secondarily, the Wilcoxon signed-rank test. Data will be analyzed in terms of both their
absolute values and their relationship to the percentage change based on the values
established in the baseline tests. The significance level will be set at p<0.05.
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