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: 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.