Abstract: Gradually strengthening electric stimulation impulses are sent to the median nerve at the wrist. Thereby an action potential caused on some level of the stimulation signal proceeds along the sensory nerve to the spinal cord, from where the nerve impulse (Hoffmann's reflex) returns via the alpha motor neuron pool along a motor nerve to a muscle and causes the movement of the muscle. This movement is detected by an accelerometer. The intensity of the stimulation signal and the time from the stimulation signal to the motoric response are saved, and by means of these the level of fatigue is evaluated. A device comprises a cuff with two electrodes and a current generator for forming impulses for the electrodes. The cuff can be placed on the wrist such that at least one of the electrodes is on the volar side of the hand at the point of the median nerve. The measuring device further comprises an accelerometer, that is provided to produce a signal, when the accelerometer detects a movement.

Abstract: A method and device arrangement are for indicating a state of overstress in a nervous muscular system. An interference current, the frequency and current strength of which can be adjusted, is fed into a part of the nervous muscular system. Those adjustment values of the interference current are stored, which cause one of a set of predetermined physical sensations in the examined part of the nervous muscular system. A measurement-specific average of the strength of the interference current is calculated for each predetermined physical response or sensation in the examined part of the examined nervous muscular system. The measurement-specific average of the interference current for each physical sensation is normalised and a state of overstress of the nervous muscular system is indicated, if the measurement-specific normalised average of the interference current of the physical sensation does not fulfil a set statistical criteria.

Abstract: Gradually strengthening electric stimulation impulses are sent to the median nerve at the wrist. Thereby an action potential caused on some level of the stimulation signal proceeds along the sensory nerve to the spinal cord, from where the nerve impulse (Hoffmann's reflex) returns via the alpha motor neuron pool along a motor nerve to a muscle and causes the movement of the muscle. This movement is detected by an accelerometer. The intensity of the stimulation signal and the time from the stimulation signal to the motoric response are saved, and by means of these the level of fatigue is evaluated. A device comprises a cuff with two electrodes and a current generator for forming impulses for the electrodes. The cuff can be placed on the wrist such that at least one of the electrodes is on the volar side of the hand at the point of the median nerve. The measuring device further comprises an accelerometer, that is provided to produce a signal, when the accelerometer detects a movement.

Abstract: A method and device arrangement are for indicating a state of overstress in a nervous muscular system. An interference current, the frequency and current strength of which can be adjusted, is fed into a part of the nervous muscular system. Those adjustment values of the interference current are stored, which cause one of a set of predetermined physical sensations in the examined part of the nervous muscular system. A measurement-specific average of the strength of the interference current is calculated for each predetermined physical response or sensation in the examined part of the examined nervous muscular system. The measurement-specific average of the interference current for each physical sensation is normalised and a state of overstress of the nervous muscular system is indicated, if the measurement-specific normalised average of the interference current of the physical sensation does not fulfil a set statistical criteria.