BACKGROUND Minorities have an increased incidence of obesity-related cerebrovascular disease. Unf... more BACKGROUND Minorities have an increased incidence of obesity-related cerebrovascular disease. Unfortunately, effective weight management in this vulnerable population has significant barriers. OBJECTIVE Determine feasibility and preliminary treatment effects of using a SmartPhone based weight loss intervention versus food journals to monitor dietary patterns in minority acute stroke patients (Swipe out Stroke). METHODS Swipe out Stroke is a pilot Prospective Randomized Controlled Trial with Open Blinded Endpoint (PROBE) study. After written informed consent was obtained, both patients and their caregivers were screened for vascular risk factors using cluster enrollment at a Joint Commission Comprehensive Stroke Center in Houston Texas. Adaptive randomization was used for assignment to one of two groups – 1) behavior intervention with SmartPhone based self-monitoring, 2) behavior intervention with food journal self-monitoring. Caregivers joined the group of the study participant. The...
Startling acoustic stimulation (SAS), via activation of reticulospinal (RS) pathways, has shown t... more Startling acoustic stimulation (SAS), via activation of reticulospinal (RS) pathways, has shown to increase muscle strength in healthy subjects. We hypothesized that, given RS hyperexcitability in stroke survivors, SAS could increase muscle strength in stroke survivors. The objective was to quantify the effect of SAS on maximal and sub-maximal voluntary elbow flexion on the contralesional (impaired) side in stroke survivors as compared to ipsilesional (non-impaired) side and healthy controls. Thirteen hemiparetic stroke survivors and 12 healthy subjects volunteered for this investigation. Acoustic stimulation was given at rest, during ballistic maximal and sustained sub-maximal isometric elbow contractions using low (80 dB) and high intensity sound (105 dB). The effect of acoustic stimuli was evaluated from EMG and force recordings. Prevalence of acoustic startle reflex with shorter latency in the impaired biceps was greater as compared to the response in the non-impaired side of st...
The objective was to re-evaluate the controversial reports of EMG-torque relation between impaire... more The objective was to re-evaluate the controversial reports of EMG-torque relation between impaired and non-impaired sides using linear electrode array EMG recordings. Ten subjects with chronic stroke performed a series of submaximal isometric elbow flexion tasks. A 20-channel linear array was used to record surface EMG of the biceps brachii muscles from both impaired and non-impaired sides. M-wave recordings for bilateral biceps brachii muscles were also made. Distribution of the slope of the EMG-torque relations for the individual channels showed a quasi-symmetrical "M" shaped pattern. The lowest value corresponded to the innervation zone (IZ) location. The highest value from the slope curve for each side was selected for comparison to minimize the effect of electrode placement and IZ asymmetry. The slope was greater on the impaired side in 4 of 10 subjects. There were a weak correlation between slope ratio and strength ratio and a moderate to high correlation between slo...
ABSTRACT: This paper presents a control of stiffness for an actuator that utilizes the properties... more ABSTRACT: This paper presents a control of stiffness for an actuator that utilizes the properties of shape memory alloy (SMA) wires. The control algorithm is developed based on angular position of the SMA actuated arm. The model for calculation of stiffness is prepared in MATLAB/Simulink environment. In this application, a PID controller is designed to regulate the applied voltage of the SMA wire. For all the experiments, dSPACE hardware-in-the-loop solution is used. Simulation and experimental results are collected to validate system model. Result show good performance and control of stiffness through PID control system. INTRODUCTION:
BACKGROUND Minorities have an increased incidence of obesity-related cerebrovascular disease. Unf... more BACKGROUND Minorities have an increased incidence of obesity-related cerebrovascular disease. Unfortunately, effective weight management in this vulnerable population has significant barriers. OBJECTIVE Determine feasibility and preliminary treatment effects of using a SmartPhone based weight loss intervention versus food journals to monitor dietary patterns in minority acute stroke patients (Swipe out Stroke). METHODS Swipe out Stroke is a pilot Prospective Randomized Controlled Trial with Open Blinded Endpoint (PROBE) study. After written informed consent was obtained, both patients and their caregivers were screened for vascular risk factors using cluster enrollment at a Joint Commission Comprehensive Stroke Center in Houston Texas. Adaptive randomization was used for assignment to one of two groups – 1) behavior intervention with SmartPhone based self-monitoring, 2) behavior intervention with food journal self-monitoring. Caregivers joined the group of the study participant. The...
Startling acoustic stimulation (SAS), via activation of reticulospinal (RS) pathways, has shown t... more Startling acoustic stimulation (SAS), via activation of reticulospinal (RS) pathways, has shown to increase muscle strength in healthy subjects. We hypothesized that, given RS hyperexcitability in stroke survivors, SAS could increase muscle strength in stroke survivors. The objective was to quantify the effect of SAS on maximal and sub-maximal voluntary elbow flexion on the contralesional (impaired) side in stroke survivors as compared to ipsilesional (non-impaired) side and healthy controls. Thirteen hemiparetic stroke survivors and 12 healthy subjects volunteered for this investigation. Acoustic stimulation was given at rest, during ballistic maximal and sustained sub-maximal isometric elbow contractions using low (80 dB) and high intensity sound (105 dB). The effect of acoustic stimuli was evaluated from EMG and force recordings. Prevalence of acoustic startle reflex with shorter latency in the impaired biceps was greater as compared to the response in the non-impaired side of st...
The objective was to re-evaluate the controversial reports of EMG-torque relation between impaire... more The objective was to re-evaluate the controversial reports of EMG-torque relation between impaired and non-impaired sides using linear electrode array EMG recordings. Ten subjects with chronic stroke performed a series of submaximal isometric elbow flexion tasks. A 20-channel linear array was used to record surface EMG of the biceps brachii muscles from both impaired and non-impaired sides. M-wave recordings for bilateral biceps brachii muscles were also made. Distribution of the slope of the EMG-torque relations for the individual channels showed a quasi-symmetrical "M" shaped pattern. The lowest value corresponded to the innervation zone (IZ) location. The highest value from the slope curve for each side was selected for comparison to minimize the effect of electrode placement and IZ asymmetry. The slope was greater on the impaired side in 4 of 10 subjects. There were a weak correlation between slope ratio and strength ratio and a moderate to high correlation between slo...
ABSTRACT: This paper presents a control of stiffness for an actuator that utilizes the properties... more ABSTRACT: This paper presents a control of stiffness for an actuator that utilizes the properties of shape memory alloy (SMA) wires. The control algorithm is developed based on angular position of the SMA actuated arm. The model for calculation of stiffness is prepared in MATLAB/Simulink environment. In this application, a PID controller is designed to regulate the applied voltage of the SMA wire. For all the experiments, dSPACE hardware-in-the-loop solution is used. Simulation and experimental results are collected to validate system model. Result show good performance and control of stiffness through PID control system. INTRODUCTION:
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