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Full-Text Articles in Medicine and Health Sciences
Impaired Regulation Post-Stroke Of Motor Unit Firing Behavior During Volitional Relaxation Of Knee Extensor Torque Assessed Using High Density Surface Emg Decomposition, Spencer A. Murphy, Reivian Berrios, P. Andrew Nelson, Francesco Negro, Dario Farina, Brian D. Schmit, Allison Hyngstrom
Impaired Regulation Post-Stroke Of Motor Unit Firing Behavior During Volitional Relaxation Of Knee Extensor Torque Assessed Using High Density Surface Emg Decomposition, Spencer A. Murphy, Reivian Berrios, P. Andrew Nelson, Francesco Negro, Dario Farina, Brian D. Schmit, Allison Hyngstrom
Physical Therapy Faculty Research and Publications
The purpose of this study was to use high density surface EMG recordings to quantify stroke-related abnormalities in motor unit firing behavior during repeated sub-maximal knee extensor contractions. A high density surface EMG system (sEMG) was used to record and extract single motor unit firing behavior in the vastus lateralis muscle of 6 individuals with chronic stroke and 8 controls during repeated sub-maximal isometric knee extension contractions. Paretic motor unit firing rates were increased with subsequent contractions (6.19±0.35 pps vs 7.89±0.66 pps, P
Muscle Fatigue And Motor Output Variability With Acute Stress In Healthy Young Adults And Veterans With Posttraumatic Stress Disorder, Manda Linea Keller
Muscle Fatigue And Motor Output Variability With Acute Stress In Healthy Young Adults And Veterans With Posttraumatic Stress Disorder, Manda Linea Keller
Dissertations (1934 -)
Acute stress can alter motor performance differently for men and women. The first aim of this dissertation addresses possible causes for the sex difference in the motor response of a low-intensity fatiguing contraction of the elbow flexor muscles to an acute stressor (difficult mental math) in young, healthy adults. Muscle fatigue increased for men and women when exposed to the stressor, but impairment was more prominent for the women. This work showed that fatigue in the central nervous system, specifically in cortical motor and premotor areas, as well as relaxation rates of the muscle (quantified with cortical stimulation) were not …