KP351 Lecture Notes - Lecture 3: Differential Amplifier, Myocyte, Oscilloscope
3 Jan 2018
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Emg signal (emg reading 2 figure 8. 2) Emg = summation of muap (motor unit action potential) Motor units: alpha motorneuron and all muscle fibres activated by it. Muscle fibre action potential is grouped into motor units. Muscle depth: size of ap decreases with increased distance from electrodes. Temporal characteristics: time the signal takes to reach electrodes. Instrumentation setup and considerations (emg reading 2, pages 182-188) Depends on: motor task, research question, muscles being studied. Monopolar: one electrode + one at an electrically neutral site (ex. a bony prominence, m waves, t, h reflexes. Double differential: using these measurements, we can measure fatigue of muscles. Electrodes cable patient unit amplifier recording device (computer, oscilloscope) Dr. stephen d. perry, department of kinesiology & physical education page 2 faculty of. Recorded by oscilloscope or analog digital board (a/d) in computer analog digital = electrical to numbers. Gain factor: multiple by which signal is amplified (500x or 1000x, can change the multiple.
