The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We investigated muscle activation levels or patterns determined during two-joint arm movements. Twelve subjects were instructed to move their right (dominant) wrists in a horizontal plane. Surface electromyographic activities were recorded from the brachioradialis, biceps brachii, and triceps brachii. The muscle activation level was demonstrated as a function of both the elbow and shoulder torque...
The non invasive and in vivo assessment of the active and passive properties of the musculoskeletal system remains today a great challenge for the understanding of muscular diseases. In a previous paper, we showed that the transient contraction of a muscle fiber bundle triggered by electrostimulation can be followed in space and time by an ultrafast ultrasound system. On the one hand, this experiment...
Although numerous techniques are commonly used to study muscular or neuromuscular diseases, in vivo muscle contraction remains a difficult event to image in real time. On one hand, time accurate techniques such as for example, mechanomyography, electromyography, or acceleromyography; allow only the assessment of global parameters of musculo-tendinous complex. These estimated parameters are classically...
This paper describes an original system to provide a communication and control tool for people who are disabled. The mechanomyogram (MMG) is used as a control signal to operate an alphabet board. The MMG is the mechanical signal observable at the surface of a muscle due to vibration of the motor units underneath. Contraction of the muscle increases the amplitude of the vibrations. The system described...
The myoelectric signals from the biceps brachii and triceps brachii were recorded during stepwise and linearly increasing flexion and extension. The power density spectrum of each signal was determined for different force levels and the median frequency was calculated to track the average conduction velocity, which in turn reflects motor unit recruitment or de-recruitment, and thereby the control...
This work deals with motor control of simple motor acts. In a horizontal circular movement of the forearm involving only triceps and biceps brachii, the authors measured the muscular activity by surface electromyography. They have studied the reaction which takes place in the first 100 ms following the torque perturbation, regarding it as a long latency response. The authors rectified and smoothed...
A back analysis system has been used to assess the occurrence of low back pain by evaluating the fatigue characteristics of back muscle during a sustained, constant-force trunk extension. A study was made to compare the median frequency values simultaneously obtained from six back muscles of patients (in remission, but having a history of chronic back pain) and normal control subjects. The median...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.