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Low-level laser therapy improves the VO2 kinetics in competitive cyclists
Fábio J Lanferdini1,2, Renata L Krüger3,4, Bruno M Baroni5
1Laboratório de Pesquisa do Exercício, Escola de Educação Física, Fisioterapia e Dança, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. fabiolanferdini@gmail.com.
Low-level laser therapy (LLLT) improved oxygen uptake kinetics in cyclists by reducing the time constant (tau) and oxygen deficit during intense exercise. These findings suggest LLLT may enhance athletic performance through improved physiological responses.
Area of Science:
- Sports Medicine
- Exercise Physiology
- Biophotonics
Background:
- Low-level laser therapy (LLLT) shows potential for reducing neuromuscular fatigue and enhancing sports performance.
- Previous research indicated increased exercise tolerance in cyclists treated with LLLT.
- The specific effects of LLLT on oxygen uptake (VO2) kinetics during exhaustive exercise require further investigation.
Purpose of the Study:
- To evaluate the impact of varying LLLT doses on VO2 kinetics in competitive cyclists during time-to-exhaustion tests.
- To determine if LLLT influences VO2 amplitude, delay time, time constant (tau), and oxygen deficit.
Main Methods:
- A randomized, double-blind, placebo-controlled, crossover trial involving 20 male competitive cyclists.
- Participants underwent incremental and time-to-exhaustion cycling tests.
- LLLT (3, 6, or 9 J/diode) or placebo was applied to the quadriceps before exhaustion tests, with VO2 kinetics analyzed via open-circuit spirometry.
Main Results:
- LLLT significantly decreased the time constant (tau) and oxygen deficit compared to placebo (p < 0.05).
- No significant differences were observed in VO2 amplitude or VO2 delay time between LLLT and placebo conditions (p > 0.05).
Conclusions:
- LLLT effectively reduces the time constant (tau) and oxygen deficit during maximal effort cycling tests in competitive cyclists.
- These alterations in VO2 kinetics represent a potential physiological mechanism underlying the ergogenic effects of LLLT on athletic performance.
