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This paper presents our experience with developing a portable wireless medical sensor device. We use National Instruments (NI) devices and LabView for measurements studying fatigue of patients suffering multiple sclerosis (MS). Fatigue is a very frequent symptom perceived by MS patients, but the disease mechanism is poorly understood. Many efforts have been made to increase the understanding of this...
Muscle fatigue is an unavoidable problem when electrical stimulation is applied to paralyzed muscles. The detection and compensation of muscle fatigue is essential to avoid movement failure and achieve desired trajectory. This work aims to predict ankle plantar-flexion torque using stimulus evoked EMG (eEMG) during different muscle fatigue states. Five spinal cord injured patients were recruited for...
Prolonged static standing caused less freedom to move around and rest the muscles. This lack of flexibility in choosing body position contributes to health problems. It will accelerate fatigue besides discomfort, aching feet and swelling on leg. The aim of this study is to investigate the muscle activity and body discomfort while standing. Twelve subjects (seven females and five males) participated...
We undertake the study of the chaotic nature of mechanomygraphy (MMG) signal by recourse to the recent developments in the field of nonlinear dynamics. The MMG signals were measured from biceps brachii muscle of 5 subjects during fatigue of isometric contraction at 80% maximal voluntary contraction (MVC) level. Deterministic chaotic character was detected in all data by using the Volterra-Wiener-Korenberg...
Mechanomyogram is the recording of the acoustic activity associated with the muscle contraction. While discovered nearly a decade ago with the intention of providing an alternate to the surface electromyogram, it has not yet been investigated thoroughly and there are no current applications associated with MMG. This paper reports an experimental study of MMG against force of contraction and muscle...
Spectral compression of surface electromyogram (sEMG) is associated with onset of localized muscle fatigue. The spectral compression has been explained based on motor unit synchronization theory. According to this theory, motor units are pseudo randomly excited during muscle contraction, and with the onset of muscle fatigue the recruitment pattern changes such that motor unit firings become more synchronized...
Long-time exposure to repetitive or monotonous work is associated with increased risk for musculoskeletal disorders that are due to muscle fatigue. Previously, researchers reported that muscle fatigue can be estimated using a low-frequency band of an SEMG signal. However, these studies were performed exclusively during static contraction tasks. The objective of the present study was to evaluate and...
Aim of the present study was to describe a multipurpose system to be used in oral physiology research, which has been developed in order to simultaneously acquire multiple signals from the masticatory muscles (i.e. bite force, EMG activity, and muscle pain). A preliminary study was carried out to test the performance of this system in ten subjects. We investigated the effect of prolonged isometric...
Information relevant to back-pain treatment planning and outcome can be formulated by measuring the fatigue process of lumbar musculature. The clinical validation of an EMG median frequency technique for identifying lumbar muscle insufficiency in back patients and control subjects is presented. The results from two-group, stepwise discriminant analyses to identify low-back pain and non-low-back pain...
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