The method and system for assessing nervous disorders by using at least one motion sensor, a memory and a processor is disclosed, wherein the motion sensor is configured to attach to body appendages The memory is then associated with sensor periodically to record exercise data during defined exercise session The processor changes with time for analyzing exercise data to assess the progress of nervous disorders. In one embodiment, the nervous disorders are ALS, and use at least four motion sensor, so that the every arm and every leg of patient all have associated sensor. Sensor can be accelerometer, and displacement, the velocity and acceleration of relevant limb are measured during defined exercise session. Such as, patient repeat a series of ability of limbs lifting practice variation or can be associated with standard with the measurement of the related limb tremor of progress of the practice, and can also be analyzed and be classified with the stage to patient ALS and/or predicted evolution speed.
