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Motor Unit Firing Rates. Firing rate = frequencyNo. of cycles (firings) per unit of timeExample: 175 cps = 175 Hertz (Hz)Range of frequencies = the (Power) Spectrum = the BandwidthSlow twitch motor units (tonic - Type I)Frequency range = (20) 70 - 125 HzFast twitch motor units (phasic - Type II)Frequency range = 126 - 250 Hz.
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