Could relative movement between the adductor muscles and the skin invalidate surface electromyography measurement?

Elsais, WM; Preece, SJ; Jones, R; Herrington, LC

Abstract

The superficial hip adductor muscles are situated in close proximity to each other. Therefore, relative movement between the overlying skin and the muscle belly could lead to a shift in the position of surface electromyography (EMG) electrodes and contamination of EMG signals with activity from neighboring muscles. The aim of this study was to explore whether hip movements or isometric contraction could lead to relative movement between the overlying skin and 3 adductor muscles: adductor magnus, adductor longus, and adductor gracilis. The authors also sought to investigate isometric torque–EMG relationships for the 3 adductor muscles. Ultrasound measurement showed that EMG electrodes maintained a position which was at least 5 mm within the muscle boundary across a range of hip flexion–extension angles and across different contraction levels. The authors also observed a linear relationship between torque and EMG amplitude. This is the first study to use ultrasound to track the relative motion between skin and muscle and provides new insight into electrode positioning. The findings provide confidence that ultrasound-based positioning of EMG electrodes can be used to derive meaningful information on output from the adductor muscles and constitute a step toward recognized guidelines for surface EMG measurement of the adductors.

Citation

Elsais, W., Preece, S., Jones, R., & Herrington, L. (2020). Could relative movement between the adductor muscles and the skin invalidate surface electromyography measurement?. Journal of Applied Biomechanics, 36(5), 319-325. https://doi.org/10.1123/jab.2019-0299

• Journal Article Type: Article
• Acceptance Date: Jul 7, 2020
• Online Publication Date: Aug 14, 2020
• Publication Date: Oct 1, 2020
• Deposit Date: Aug 17, 2020
• Publicly Available Date: Aug 17, 2020
• Journal: Journal of Applied Biomechanics
• Print ISSN: 1065-8483
• Electronic ISSN: 1543-2688
• Publisher: Human Kinetics
• Volume: 36
• Issue: 5
• Pages: 319-325
• DOI: https://doi.org/10.1123/jab.2019-0299
• Publisher URL: https://doi.org/10.1123/jab.2019-0299
• Related Public URLs: https://journals.humankinetics.com/view/journals/jab/aop/article-10.1123-jab.2019-0299/article-10.1123-jab.2019-0299.xml
• Additional Information: Access Information : Accepted author manuscript version reprinted, by permission, from Journal of Applied Biomechanics, 2020, https://doi-org.salford.idm.oclc.org/10.1123/jab.2019-0299. © Human Kinetics, Inc.