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Selectivity Of Conventional Electrodes For Recording Motor Evoked Potentials: An Investigation With High‐Density Surface Electromyography, Alessio Gallina, Sue Peters, Jason L. Neva, Lara A. Boyd, Jayne Garland

Physical Therapy Publications

Introduction

The objective of this study was to determine whether motor evoked potentials (MEPs) elicited with transcranial magnetic stimulation and measured with conventional bipolar electromyography (EMG) are influenced by crosstalk from non-target muscles.

Methods

MEPs were recorded in healthy participants using conventional EMG electrodes placed over the extensor carpi radialis muscle (ECR) and high-density surface EMG (HDsEMG). Fifty MEPs at 120% resting and active motor threshold were recorded. To determine the contribution of ECR to the MEPs, the amplitude distribution across HDsEMG channels was correlated with EMG activity recorded during a wrist extension task.

Results

Whereas the conventional EMG identified …

Constraining Kinematics During Single-Leg Squats And Step-Ups Can Reduce Quadratus Lumborum Activation And Facilitate Gluteal Activation, Shaylyn Kowalchuk

Electronic Thesis and Dissertation Repository

Increased quadratus lumborum activation and decreased gluteal activation may lead to lateral pelvic drop and increased hip adduction and internal rotation during single-leg exercises. These activation patterns and motions are associated with low back pain or lower extremity injuries. The purpose of this study was to evaluate if mechanically restricting hip adduction and internal rotation of the femur affected muscle activation. Twenty female track and field athletes performed single-leg squats and step-ups, and the quadratus lumborum, gluteus medius and maximus muscles activations were measured with surface electromyography. This study tested the hypothesis that mechanically restricted exercises would decrease quadratus lumborum …

Electromyographic Analysis Of Hip Muscle Activity Comparing Maximal Voluntary Contraction To Manual Muscle Test Grades, Ty Bommersbach, Anthony Charbonneau,, Holly Koch, Braidy Solie

Physical Therapy Scholarly Projects

Introduction: The purpose of this study was to investigate the relationship between muscle activity during three manual muscle tests (MMT) and muscle activity during a maximal voluntary contraction (MVC) of the same muscle.

Subjects: Eleven female subjects voluntarily participated in this study. All participants were physical therapy students under the age of 30, nonpregnant, and without recent history of musculoskeletal injury.

Methods: Electromyographic (EMG) data was collected by placing surface electrodes over each participant's right tensor fasciae latae (TFL) and gluteus medius (GM) muscle. The EMG data from each muscle was transmitted by Noraxont TeleMy02400 G2 telemetry …