Load-Deformation Changes in Plantaris Muscle after Exposure to Different Ultrasonic Frequencies

The purpose of this study: was to investigate the load-deformation response of skeletal muscle under the effect of different frequencies of continuous ultrasound. Thirty New-Zealand rabbits weighting 2-2.5 kg and aging 5-6 months were used and divided into three groups. Group A: were treated with 1-MHz continuous ultrasound for single dose, Group B: were treated with 3-MHz continuous ultrasound for single dose and Group C: control group. Then a dissection of plantaris muscle in rabbits was done and taken for the mechanical testing experiment. A tensile testing machine (Instron instrument serial no.53479) was used to measure the load subjected to the specimen at high yielding point and its corresponding deformation. The result of the study showed that deformation of the samples in response to the applied load at the high yielding point revealed a significant difference between group (A) and control group (C), non statistical significant difference between group(B) and control group (C). Non statistical significant difference between group (A) and group (B). Conclusion: it can be concluded that application of ultrasound prior to stretching (regardless its frequency) has significantly influence on the extensibility of the muscle.