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Photobiomodulation Therapy on Physiological and Performance Parameters During Running Tests: Dose-Response Effects.
Rodolfo A Dellagrana1, Mateus Rossato1,2, Raphael L Sakugawa1
1Biomechanics Laboratory, Center of Sports, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
Journal of Strength and Conditioning Research
|February 27, 2018
Summary
Photobiomodulation therapy (PBMT) enhances running performance. A 30 J dose of PBMT significantly improved running economy, perceived exertion, and time to exhaustion in recreational runners compared to placebo.
Area of Science:
- Sports Medicine
- Exercise Physiology
- Biomedical Engineering
Background:
- Photobiomodulation therapy (PBMT) utilizes light energy to stimulate cellular processes.
- Its effects on physiological and performance parameters in runners require dose-response investigation.
Purpose of the Study:
- To investigate the dose-response effects of PBMT on physiological and performance metrics during running tests.
- To compare different energy doses (15, 30, and 60 J) of PBMT against control and placebo conditions.
Main Methods:
- A randomized, double-blind, placebo-controlled crossover trial involving 15 male recreational runners.
- PBMT was applied to 14 sites on each lower limb across five sessions with varying doses (0, 15, 30, 60 J) or placebo.
- Physiological (e.g., running economy, RPE) and performance (e.g., time to exhaustion) variables were assessed during submaximal and maximal running tests.
Main Results:
- PBMT at 30 J significantly improved running economy (RE) at 8 and 9 km/h, reduced rate of perceived exertion (RPE) at 8 km/h, increased velocity at VO2max, peak velocity (PV), and total time to exhaustion (TTE) compared to placebo.
- A 15 J dose also enhanced RE, RPE, PV, TTE, and total distance.
- A 60 J dose showed a smaller effect, primarily on RE at 9 km/h.
- The 30 J dose demonstrated the most beneficial effects overall.
Conclusions:
- PBMT positively influences physiological and performance parameters in runners.
- A 30 J dose appears optimal for improving running economy, perceived exertion, and endurance.
- Further research can explore optimal PBMT protocols for different athletic populations.
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