Skeletal Muscle Performance
Conditions
Keywords
Photobiomodulation Therapy, Static Magnetic Field, Subsequent performance
Brief summary
There is evidence about the effects of photobiomodulation therapy (PBMT) alone and combined with static magnetic field (PBMT-sMF) on skeletal muscle fatigue, physical performance and post-exercise recovery in different types of exercise protocols and sports activity. However, it is unknown the effects of PBMT-sMF to improve the subsequent performance after a first set of exercise. Therefore, the aim of this study was to investigate the effects of PBMT-sMF, applied between two sets of exercises, on the subsequent physical performance.
Detailed description
A randomized, crossover, triple-blinded (assessors, therapist and volunteers), placebo-controlled trial was carried out. Healthy non-athletes' male volunteers were randomized and treated with a single application of PBMT-sMF and placebo between two sets of an exercise protocol performed on isokinetic dynamometer. The order of interventions was randomized. The primary outcome was fatigue index, measured by isokinetic dynamometer during the exercise protocol. The secondary outcomes were total work and peak torque measured by isokinetic dynamometer during the exercise protocol; and blood lactate, measured by blood samples collected before, 3 minutes after the first set of the exercise protocol, 3 minutes after the application of the intervention and 3 minutes after the second set of the exercise protocol. Statistical analysis: The findings were tested for normality using the Kolmogorov-Smirnov test and were determined to have a normal distribution. Data were expressed as the mean and standard deviation, and a two-way repeated measures ANOVA was performed to test between-group differences at each timepoint (treatment effects), mean difference (MD) and 95% confidence intervals (CI), followed by the Bonferroni post hoc test. The significance level was set at p \< 0.05.
Interventions
DEVICEActive PBMT-sMF
PBMT-sMF was applied employing the Multi Radiance Medical Super Pulsed Laser MR4 console (Solon, Ohio, USA) with a LaserShower cluster probe as emitter. Six different sites of the knee extensor muscles (two medial, two lateral and two central points) were irradiated at the same time.
DEVICEPlacebo PBMT-sMF
Placebo PBMT-sMF was applied employing the Multi Radiance Medical Super Pulsed Laser MR4 console (Solon, Ohio, USA) with a LaserShower cluster probe as emitter, but without any emission of therapeutic dose. Placebo PBMT-sMF was applied at six different sites of the knee extensor muscles (two medial, two lateral and two central points).
Sponsors
University of Nove de Julho
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
PREVENTION
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Masking description
A researcher programmed the device (placebo or PMBT-sMF) and was instructed not to inform the volunteers or other researchers as to the type of treatment (placebo or PBMT-sMF). Therefore, the researcher responsible for the treatment was blinded to the type of treatment administered to the volunteers. The sounds and signals emitted from the device as well as the information displayed on the screen was identical, regardless of the type of treatment (placebo or PBMT).
Eligibility
Sex/Gender
MALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* Male healthy volunteers; * Non-athletes or those who practiced physical activity up to once a week; * Aged 18-35 years.
Exclusion criteria
* History of musculoskeletal injuries in the hip and knee regions in the two months prior to the study; * Use of pharmacological agents and nutritional supplements; * Chronic joint disease in the non-dominant lower limb.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Fatigue index | 1 minute after the end of exercise protocol. | Variable provided directly by the isokinetic dynamometer during the exercise protocol. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Total work | 1 minute after the end of exercise protocol. | Variable provided directly by the isokinetic dynamometer during the exercise protocol. |
| Peak torque | 1 minute after the end of exercise protocol. | Variable provided directly by the isokinetic dynamometer during the exercise protocol. |
| Blood lactate | 3 minutes after the first set of the exercise protocol, 3 minutes after the application of the intervention and 3 minutes after the second set of the exercise protocol. | Measured by blood samples. |
Countries
Brazil
Outcome results
None listed