Haslerud Sturla, Naterstad Ingvill Fjell, Bjordal Jan Magnus, Lopes-Martins Rodrigo Alvaro Brandão, Magnussen Liv Heide, Leonardo Patrícia Sardinha, Marques Ricardo Henrique, Joensen Jon
1 NorPhyPain Research Group, Faculty of Health and Social Sciences, Centre for Evidence Based Practice, Bergen University College , Bergen, Norway .
2 Physiotherapy Research Group, Department of Global Public Health and Primary Care, University of Bergen , Bergen, Norway .
Photomed Laser Surg. 2017 Oct;35(10):567-575. doi: 10.1089/pho.2017.4269. Epub 2017 Jun 30.
There is a lack of knowledge about the influence tissue temperature may have on laser light penetration and tendon structure. The purpose of this study was to investigate whether penetration of laser energy in human Achilles tendons differed before and after ice pack application.
The Achilles tendons (n = 54) from 27 healthy young adults were irradiated with two class 3B lasers (810 nm 200 mW continuous mode laser and a 904 nm 60 mW superpulsed mode laser). The optical energy penetrating the Achilles area was measured before and after 20 min of ice application. Measurements were obtained after 30, 60, and 120 sec irradiation with the 904 nm laser and after 30 and 60 sec irradiation with the 810 nm laser. Achilles tendon thickness was measured with ultrasonography.
Optical energy penetration increased significantly (p < 0.01) after ice application for both lasers and at all time points from 0.34% to 0.39% of energy before ice application to 0.43-0.52% of energy after ice application for the 904 nm laser and from 0.24% to 0.25% of energy before ice application to 0.30-0.31% of energy after ice application for the 810 nm laser. The energy loss per centimeter of irradiated tissue was significantly higher (p < 0.05) at all time points after ice application. Ultrasonography imaging of skin-to-skin and transversal tendon thickness was significantly reduced after ice application at p = 0.05 and p = 0.03, respectively. Achilles tendon thickness in the longitudinal plane remained unchanged (p = 0.49).
The penetration of laser light increased significantly through healthy Achilles tendons subjected to 20 min of cooling. These findings occurred in the presence of a significant reduction in skin temperature and Achilles tendon thickness.
对于组织温度对激光穿透及肌腱结构的影响，目前仍缺乏了解。本研究旨在探究冰敷前后激光能量在人体跟腱中的穿透情况是否存在差异。
对27名健康年轻成年人的54条跟腱进行两种3B级激光照射（810nm 200mW连续模式激光和904nm 60mW超脉冲模式激光）。在冰敷20分钟前后测量穿透跟腱区域的光能。使用904nm激光照射30、60和120秒后以及使用810nm激光照射30和60秒后进行测量。用超声测量跟腱厚度。
两种激光在冰敷后，所有时间点的光能穿透均显著增加（p<0.01），904nm激光从冰敷前能量的0.34%至0.39%增加到冰敷后能量的0.43 - 0.52%，810nm激光从冰敷前能量的0.24%至0.25%增加到冰敷后能量的0.30 - 0.31%。冰敷后所有时间点每厘米受照射组织的能量损失百分比显著更高（p<0.05）。冰敷后，皮肤到皮肤的超声成像和横向肌腱厚度分别在p = 0.05和p = 0.03时显著减小。纵向平面的跟腱厚度保持不变（p = 0.49）。
经过20分钟冷却的健康跟腱，激光穿透显著增加。这些发现是在皮肤温度和跟腱厚度显著降低的情况下出现的。
