A Static Bioimpedance and Dynamic Acoustic Myography Preliminary Assessment of Low Frequency Therapeutic Ultrasound Treatment of the Shoulder Muscle Trapezius: An Equine Study

摘要

Background: In horses, therapeutic ultrasound has been shown to be beneficial for suspensory ligament injuries, and more generally to stimulate tissue repair and reduce localized pain. However, it has yet to be examined in relation to soft tissue injuries sustained during competition or in connection with rider/saddle interactions. Aim: The aim of the present study was to examine the efficacy of topical low-frequency therapeutic ultrasound on the shoulder muscles of injured horses. Methods: Muscle mass and cellular health was assessed for M. trapezius using non-invasive multi-frequency bioimpedance, and dynamic improvements in M. trapezius and M. latissimus dorsi were examined using acoustic myography (AMG). A total of 8 injured horses (painful to palpation and atrophied) were treated using an style="font-family:;" "=""> style="font-family:;" "="">EQ Pro Therapy unit, following a set protocol that comprised treatment every other day for 10 treatments. Pre-treatment values were then compared with post-treatment measurements (1 & 6 months later). style="font-family:;" "="">Results: style="font-family:;" "=""> style="font-family:;" "="">The mfBIA results for M. trapezius showed a significant improvement (P style="font-family:;" "=""> style="font-family:;" "="">/span> style="font-family:;" "=""> style="font-family:;" "="">0.05) of EQ Pro Therapy treatment for the membrane capacitance (Mc) and phase angle (PA) parameters when comparing the Pre >vs Post style="font-family:;" "=""> style="font-family:;" "="">1 and Post style="font-family:;" "=""> style="font-family:;" "="">1 >vs Post style="font-family:;" "=""> style="font-family:;" "="">2 measurements. Similar improvements were seen for the AMG measurements for M. trapezius and M. latissimus dorsi where statistically significant improvements in the muscle efficiency (E-score) and temporal summation (T-score) as well as the spatial summation (S-score) and mean of the ST-scores were noted style="font-family:;" "=""> style="font-family:;" "="">(P style="font-family:;" "=""> style="font-family:;" "="">/span> style="font-family:;" "=""> style="font-family:;" "="">0.05 to P style="font-family:;" "=""> style="font-family:;" "="">/span> style="font-family:;" "=""> style="font-family:;" "="">0.01). style="font-family:;" "=""> style="font-family:;" "="">Conclusion: style="font-family:;" "=""> The present findings suggest that style="font-family:;" "="">EQ Pro Therapy treatment is efficacious in terms of equine cases involving soft tissue shoulder muscle injuries ( style="font-family:;" "="">painful to palpation and atrophied). style="font-family:;" "=""> style="font-family:;" "="">The main improvements noted were not only increased muscle mass and cellular health style="font-family:;" "=""> style="font-family:;" "="">but also style="font-family:;" "="">improved force production, better coordination style="font-family:;" "="">, style="font-family:;" "=""> and lateral balance, which persisted for at least six months after treatment.