Brigham Young University, Provo, UT.
J Athl Train. 2000 Jan;35(1):50-5.
To compare tissue temperature rise and decay after 20-minute diathermy and ultrasound treatments.
We inserted 3 26-gauge thermistor microprobes into the medial aspect of the anesthetized triceps surae muscle at a depth of 3 cm and spaced 5 cm apart. Eight subjects received the diathermy treatment first, followed by the ultrasound treatment. This sequence was reversed for the remaining 8 subjects. The diathermy was applied at a frequency of 27.12 MHz at the following settings: 800 bursts per second, 400-microsecond burst duration, 850-microsecond interburst interval, peak root mean square amplitude of 150 W per burst, and an average root mean square output of 48 W per burst. The ultrasound was delivered at a frequency of 1 MHz and an intensity of 1.5 W/cm(2) in the continuous mode for 20 minutes over an area of 40 times the effective radiating area. The study was performed in a ventilated research laboratory.
Sixteen (11 men, 5 women) healthy subjects (mean age = 23.56 +/- 4.73 years) volunteered to participate in this study.
We recorded baseline, final, and decay temperatures for each of the 3 sites.
The average temperature increases over baseline temperature after pulsed short-wave diathermy were 3.02 degrees C +/- 1.02 degrees C in site 1, 4.58 degrees C +/- 0.87 degrees C in site 2, and 3.28 degrees C +/- 1.64 degrees C in site 3. The average temperature increases over baseline temperature after ultrasound were only 0.17 degrees C +/- 0.40 degrees C, 0.09 degrees C +/- 0.56 degrees C, and -0.43 degrees C +/- 0.41 degrees C in sites 1, 2, and 3, respectively. The temperature dropped only 1 degrees C in 7.65 +/- 4.96 minutes after pulsed short-wave diathermy.
We conclude that pulsed short-wave diathermy was more effective than 1-MHz ultrasound in heating a large muscle mass and resulted in the muscles' retaining heat longer.
比较 20 分钟热疗和超声治疗后的组织温升和衰减。
我们在麻醉后的三头肌内侧插入 3 个 26 号热敏微探头，深度为 3 厘米，间隔 5 厘米。8 名受试者先接受热疗，然后接受超声治疗。其余 8 名受试者的顺序相反。热疗频率为 27.12 MHz，设置如下：每秒 800 个脉冲，脉冲持续时间 400 微秒，脉冲间隔 850 微秒，每个脉冲的峰值均方根幅度为 150 W，平均均方根输出为 48 W。超声以 1 MHz 的频率在连续模式下以 1.5 W/cm2 的强度作用 20 分钟，作用面积为有效辐射面积的 40 倍。研究在通风的研究实验室进行。
16 名（11 名男性，5 名女性）健康受试者（平均年龄=23.56 +/- 4.73 岁）自愿参加本研究。
我们记录了每个部位的基线、终值和衰减温度。
脉冲短波热疗后平均体温升高超过基础体温分别为 3.02 摄氏度 +/- 1.02 摄氏度（部位 1）、4.58 摄氏度 +/- 0.87 摄氏度（部位 2）和 3.28 摄氏度 +/- 1.64 摄氏度（部位 3）。超声后平均体温升高仅为 0.17 摄氏度 +/- 0.40 摄氏度、0.09 摄氏度 +/- 0.56 摄氏度和-0.43 摄氏度 +/- 0.41 摄氏度（部位 1、2 和 3）。脉冲短波热疗后仅 7.65 +/- 4.96 分钟，温度下降 1 摄氏度。
我们得出结论，脉冲短波热疗在加热大块肌肉方面比 1 MHz 超声更有效，并且使肌肉保持热量的时间更长。
