David O. Draper is Associate Professor and Associate Coordinator of Athletic Training at Brigham Young University, Provo, UT 84602. He is also Athletic Trainer at BYU football team.
J Athl Train. 1993 Fall;28(3):246-50.
One benefit of ultrasound over infrared modalities is its ability to penetrate subcutaneous fat. The purpose of this study was to compare tissue temperature rise during ultrasound treatments in humans with various thicknesses of subcutaneous fat in the medial gastrocnemius. Twenty males served as subjects. A 23-gauge hypodermic needle microprobe was inserted 3-cm deep into the medial portion of the anesthetized gastrocnemius, and connected to a thermocouple temperature gauge. We applied 15 ml of ultrasound gel, preheated to body temperature (37 degrees C), to a 10-cm-diameter target area. Continuous ultrasound was delivered topically at 1.5 W/cm(2) for 10 minutes. During this time, the soundhead was moved at a speed of 4 cm per second, and the temperature was recorded every 30 seconds. The mean baseline temperature for all subjects was 35.4 degrees C. The mean temperature increase was 4.9 degrees C. We performed a regression analysis to test for correlation between fat thickness and tissue temperature rise of subjects. There was a small positive but insignificant correlation (r=.128). This supports the claim of Grotthus and Draper. Since subcutaneous fat does not serve as a barrier to therapeutic ultrasound, athletic trainers and physical therapists can expect comparable increases in muscle temperature when using this modality on people with varying thicknesses of adipose tissue.
超声相较于红外模式的一个优势在于其能够穿透皮下脂肪。本研究旨在比较人体不同厚度的皮下脂肪在接受超声治疗时组织温度的上升情况。20 名男性作为研究对象。将一根 23 号皮下注射用微探头插入麻醉后的腓肠肌内侧 3cm 深处，并与热电偶温度计相连。我们将 15 毫升预先加热至体温（37°C）的超声凝胶涂敷在 10cm 直径的目标区域。连续超声以 1.5 W/cm²的强度局部应用 10 分钟。在此期间，声头以 4cm/秒的速度移动，每 30 秒记录一次温度。所有研究对象的平均基线温度为 35.4°C。平均温度升高 4.9°C。我们进行了回归分析，以测试脂肪厚度与研究对象组织温度升高之间的相关性。存在一个小的但无统计学意义的正相关（r=.128）。这支持了 Grotthus 和 Draper 的说法。由于皮下脂肪不会成为治疗性超声的障碍，运动训练师和物理治疗师可以预期在使用这种模式治疗不同脂肪厚度的人群时，肌肉温度会有类似的升高。
