Postgraduate Program in Human Movement Sciences, State University of Northern Paraná (UENP), Jacarezinho, Paraná, Brazil.
Postgraduate Program in Rehabilitation Sciences, Northern University of Paraná (UNOPAR), Londrina, Paraná, Brazil.
Lasers Med Sci. 2024 May 31;39(1):145. doi: 10.1007/s10103-024-04099-8.
Photobiomodulation therapy (PBMT) has been advocated as a potential intervention to improve muscle performance and recovery in the health and sports context. However, the short- and long-term effects of PBMT on endurance running performance remain under-researched and controversial. The purpose of this study was to investigate the acute dose-response effect of PBMT with light-emitting diodes (LEDs) on endurance performance and rating of perceived exertion (RPE; 6-20 Borg) during a 5-km running trial in recreational runners. In a crossover design, eighteen young adult runners (28.7 ± 7.8 years) were randomized to receive 1 of 4 PBMT conditions (placebo, 300, 900, and 1260 Joules [J]) 60 min before the 5-km running trial on four occasions, separated by a 2-wk washout period. The treatments were applied to the quadriceps, hamstrings, and gastrocnemius muscles of both legs using a device containing 200 LEDs (100 red and 100 infrared). The following variables were assessed: endurance performance (i.e. total time, mean velocity, and velocity in the split distances at the initial 200 m and every 400 m lap) and RPE in the split distances at the initial 200 m and every 400 m lap. Data normality and homogeneity were tested using Shapiro-Wilk's and Levene's tests, respectively. Differences between treatment conditions were assessed using the analysis of variance tests (one- or two-way ANOVA, depending on the comparisons), complemented by the Bonferroni post hoc test. There were significant time effects for the running velocity and RPE in the split distances (p < 0.0001), with no significant treatment-by-time interaction (running velocity, p = 0.59; RPE, p = 0.95). The mean velocity (p = 0.997), total time (p = 0.998), and total mean of the RPE (p = 0.91) were similar between treatment conditions. In conclusion, acute PBMT with LEDs at doses of 300, 900, and 1260 J is not recommended for improving endurance performance and RPE in the 5-km running trial in recreational runners.
光生物调节疗法（PBMT）已被提倡作为一种潜在的干预措施，以改善健康和运动环境中的肌肉性能和恢复。然而，PBMT 对耐力跑步表现的短期和长期影响仍未得到充分研究和争议。本研究的目的是在 18 名年轻成年跑步者（28.7±7.8 岁）中，调查使用发光二极管（LED）的 PBMT 的急性剂量反应效应，在 4 次交叉设计的情况下，在 5 公里跑步试验前 60 分钟，随机接受 4 种 PBMT 条件（安慰剂、300、900 和 1260 焦耳[J]）之一，两次冲洗期之间间隔 2 周。该治疗方法应用于双腿的股四头肌、腿筋和小腿肌肉，使用包含 200 个 LED（100 个红色和 100 个红外线）的设备。评估了以下变量：耐力表现（即总时间、平均速度以及初始 200 米和每 400 米圈的速度）和初始 200 米和每 400 米圈的 RPE。数据正态性和同质性分别采用 Shapiro-Wilk 检验和 Levene 检验进行检验。使用方差分析检验（根据比较情况为单向或双向方差分析）评估处理条件之间的差异，并用 Bonferroni 事后检验进行补充。在分割距离的跑步速度和 RPE 上存在显著的时间效应（p<0.0001），但无显著的治疗-时间交互作用（跑步速度，p=0.59；RPE，p=0.95）。在处理条件之间，平均速度（p=0.997）、总时间（p=0.998）和 RPE 的总平均值（p=0.91）相似。总之，在 5 公里跑步试验中，在休闲跑步者中，300、900 和 1260 J 的急性 PBMT 不建议用于提高耐力表现和 RPE。
