New measuring and training method of muscle powerfor elderly seniors has been proposed in this paper ． The method uti ［ lzes not " spring " that is used for conventional measurement instruments for muscle ， but smalI 「 ' generator " that is used for charging battery ． Our previous study clarified that this method can measure not only the muscle power 、 but also refiection time and muscle strength without any physical stress on old − old subject ． This paper describes that another advantage of employing generator 、 The advantage is that generator can work as " regenerating brake " ， This means that the braking force can be used as the load for training or rehabilitation ． If this funct めrl could be realize， total analyzing and rehab litation system would be produced with a compact device body ． Therefore the feasibility ofthe proposed method as a training system is investigated ． Experimental results show the eficiency of the proposed method and system ．