اثرات فراصوت پالسي و ممتد در نواحي اطراف ستون مهره اي بر متغيرهاي رفلكس هافمن عضله سه سر ساقي

The Effects of Pulsed and Continuous Ultrasound on the Para-Spinal Regions on Parameters of H. Reflex of Triceps Surae

Background: The thermal and non-thermal effects of ultrasound has been used in physiotherapy of low back pain for a long time. The purpose of this study was to investigate the thermal and non-thermal effects of applying therapeutic ultrasound on the spinal mixed nerves (S 1 - S2) of paravertebral regions on the Parameters of H reflex of triceps surae muscles. Materials and methods: Fourteen healthy women between 20 to 30 years old were participated in 3 sessions of this experiment: Each subject voluntarily shared in 3 sessions of: 1. Continuos ultrasound (intensity: 1.5 w/cm2, for 5 minutes) 2. Pulsed ultrasound (intensity: 1 w/cm2, for 5 minutes) 3. Placebo ultrasound for 5 minutes) At each session 5 maximal, H reflexes and 3-M waves were recorded before (TO), immediately after (Ti) and 5 minutes after (T5) applying the ultrasound. Results: Statistical measurements showed no significant differences in latency and amplitude of H reflex and HIM ratio at TO, T1 and T5 recordings between the three ultrasound groups. Conclusion: This study showed that the thermal and non-thermal properties of ultrasound have no effect on motoneurone pool excitability and conduction through the spinal roots.