Department of Physical Education, Brigham Young University, Provo, UT 84602.
J Athl Train. 1998 Apr;33(2):141-4.
With respect to increasing ankle dorsiflexion range of motion, our objective was to examine the influence, if any, of preheating the triceps surae with ultrasound before stretching.
Subjects were assigned to either group A (ultrasound and stretch) or group B (stretch alone). Group A received 3-MHz ultrasound (1.5 W/cm(2), 4 times effective radiating area) for 7 minutes to the musculotendinous junction of the triceps surae before stretching. Group B rested for 7 minutes before stretching. Both groups then performed identical calf stretches for 4 minutes. Treatment for both groups was conducted at the Brigham Young University Sports Injury Research Laboratory twice daily for 5 days with at least 3 hours between procedures. We analyzed the data with a 2 x 3 x 10 factorial analysis of variance with repeated measures. A Tukey post hoc test was used to identify significant differences in range of motion.
Forty college students (male = 18, female = 22, age = 20.4 +/- 2.5 years) volunteered for the study.
Maximal ankle dorsiflexion range of motion was measured using an inclinometer before and after each treatment.
Immediate effects were that ultrasound and stretch increased mean dorsiflexion range of motion in all sessions significantly more than stretch alone in three treatment sessions. Residual effects were that dorsiflexion range of motion increased 3 degrees in both groups after nine treatment sessions; however, neither group significantly outperformed the other.
As studied, an ultrasound and stretch routine may increase immediate range of motion more than stretch alone, possibly enhancing performance in practice and competition. This increased range of motion, however, is not maintained over the long term and is not more than the range of motion gained from stretching alone. A similar study using subjects with decreased range of motion after immobilization or injury should be conducted to see if the ultrasound and stretch regimen would produce lasting range-of-motion increases.
为了增加踝关节背屈活动度，我们的目的是研究在拉伸前使用超声对跟腱肌腹进行预热是否有影响。
将受试者分为 A 组（超声加拉伸）或 B 组（单独拉伸）。A 组在拉伸前用 3MHz 超声（1.5W/cm2，4 次有效辐射面积）对跟腱肌腹进行 7 分钟治疗。B 组在拉伸前休息 7 分钟。然后两组都进行 4 分钟相同的小腿拉伸。两组均在杨百翰大学运动损伤研究实验室每天两次进行治疗，每次间隔至少 3 小时，共进行 5 天。我们使用 2x3x10 析因方差分析和重复测量来分析数据。Tukey 事后检验用于确定运动范围的显著差异。
40 名大学生（男性=18 名，女性=22 名，年龄=20.4±2.5 岁）自愿参加了这项研究。
使用测角器在每次治疗前后测量最大踝关节背屈活动度。
即时效应是，在所有三次治疗中，超声加拉伸比单独拉伸显著增加了平均背屈活动度。残留效应是，在九次治疗后，两组的背屈活动度都增加了 3 度；然而，两组都没有明显优于另一组。
在本研究中，超声加拉伸方案可能比单独拉伸更能增加即时活动范围，可能会提高实践和比赛中的表现。然而，这种增加的活动范围并不能长期维持，也不会超过单独拉伸所获得的活动范围。应该对因固定或受伤而活动范围减小的受试者进行类似的研究，以确定超声和拉伸方案是否会产生持久的活动范围增加。
