Dellagrana Rodolfo André, Rossato Mateus, Sakugawa Raphael Luiz, Lazzari Caetano Decian, Baroni Bruno Manfredini, Diefenthaeler Fernando
Biomechanics Laboratory, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
Human Performance Laboratory, Physical Education and Physical Therapy Faculty, Federal University of Amazonas, Manaus, AM, Brazil.
Lasers Med Sci. 2018 Feb;33(2):329-336. doi: 10.1007/s10103-017-2378-4. Epub 2017 Nov 3.
The purpose of this study was to verify the photobiomodulation therapy (PBMT) effects with different doses on neuromuscular economy during submaximal running tests. Eighteen male recreational runners participate in a randomized, double-blind, and placebo-controlled trial, which each participant was submitted to the same testing protocol in five conditions: control, placebo, and PBMT with doses of 15, 30, and 60 J per site (14 sites in each lower limb). The submaximal running was performed at 8 and 9 km h during 5 min for each velocity. Muscle activation of the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), and gastrocnemius lateralis (GL) was collected during the last minute of each running test. The root mean square (RMS) was normalized by maximal isometric voluntary contraction (MIVC) performed a priori in an isokinetic dynamometer. The RMS sum of all muscles (RMS) was considered as main neuromuscular economy parameter. PBMT with doses of 15, 30, and 60 J per site [33 diodes = 5 lasers (850 nm), 12 LEDs (670 nm), 8 LEDs (880 nm), and 8 LEDs (950 nm)] or placebo applications occurred before running tests. For the statistical analysis, the effect size was calculated. Moreover, a qualitative inference was used to determine the magnitude of differences between groups. Peak torque and RMS during MIVCs showed small effect sizes. According to magnitude-based inference, PBMT with dose of 15 J per site showed possibly and likely beneficial effects on neuromuscular economy during running at 8 and 9 km h, respectively. On other hand, PBMT with doses of 30 and 60 J per site showed possible beneficial effects only during running at 9 km h. We concluded that PBMT improve neuromuscular economy and the best PBMT dose was 15 J per site (total dose of 420 J).
本研究的目的是验证不同剂量的光生物调节疗法（PBMT）在次最大强度跑步测试期间对神经肌肉经济性的影响。18名男性休闲跑步者参与了一项随机、双盲、安慰剂对照试验，每位参与者在五种条件下接受相同的测试方案：对照、安慰剂，以及每部位剂量为15、30和60焦耳的PBMT（每条下肢14个部位）。次最大强度跑步在每个速度下以8和9公里/小时的速度进行5分钟。在每次跑步测试的最后一分钟收集股外侧肌（VL）、股内侧肌（VM）、股直肌（RF）、股二头肌（BF）和腓骨外侧肌（GL）的肌肉激活情况。均方根（RMS）通过事先在等速测力计上进行的最大等长自主收缩（MIVC）进行标准化。所有肌肉的RMS总和（RMS）被视为主要的神经肌肉经济性参数。每部位剂量为15、30和60焦耳的PBMT[33个二极管=5个激光器（850纳米）、12个发光二极管（670纳米）、8个发光二极管（880纳米）和8个发光二极管（950纳米）]或安慰剂应用在跑步测试前进行。对于统计分析，计算效应大小。此外，使用定性推断来确定组间差异的大小。MIVC期间的峰值扭矩和RMS显示出较小的效应大小。根据基于大小的推断，每部位剂量为15焦耳的PBMT分别在8和9公里/小时的跑步过程中对神经肌肉经济性显示出可能和很可能有益的影响。另一方面，每部位剂量为30和60焦耳的PBMT仅在9公里/小时的跑步过程中显示出可能有益的影响。我们得出结论，PBMT可改善神经肌肉经济性，最佳的PBMT剂量为每部位15焦耳（总剂量420焦耳）。
