[Development of the new power-spectrum measuring system and its use in masseter muscle EMG].
D004576:Electromyography / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D007537:Isometric Contraction; D008406:Masseter Muscle / Q000502:physiology*; D008410:Masticatory Muscles / Q000502:physiology*; D010474:Percussion; D014070:Tooth / Q000502:physiology