Abstract
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial. On the first day, the participants performed an incremental cycling test to exhaustion to determine maximal oxygen uptake (VO2MAX) and maximal power output (POMAX), as well as a familiarization with the time-to-exhaustion test. In the following days (2 to 5), all participants performed time-to-exhaustion tests at POMAX. Before the exhaustion test, different doses of LLLT (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh, respectively) or placebo were applied bilaterally to the quadriceps muscle. All exhaustion tests were monitored online by an open-circuit spirometry system in order to analyze the VO2 amplitude, VO2 delay time, time constant (tau), and O2 deficit. Tau and O2 deficit were decreased with LLLT applications compared to the placebo condition (p < 0.05). No differences (p > 0.05) were found between the experimental conditions for VO2 amplitude and VO2 delay time. In conclusion, LLLT decreases tau and O2 deficit during time-to-exhaustion tests in competitive cyclists, and these changes in VO2 kinetics response can be one of the possible mechanisms to explain the ergogenic effect induced by LLLT.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee, approved by the Ethics Committee of Human Research where the study was conducted (number 708.362) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Renata L. Krüger is a researcher sponsored by the Brazilian National Research Council (CNPq), Brazil.
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Lanferdini, F.J., Krüger, R.L., Baroni, B.M. et al. Low-level laser therapy improves the VO2 kinetics in competitive cyclists. Lasers Med Sci 33, 453–460 (2018). https://doi.org/10.1007/s10103-017-2347-y
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DOI: https://doi.org/10.1007/s10103-017-2347-y