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The EMG signal above 50 Hz were recorded at 4 kHz sampling frequency. The experiments were conducted to have the same 2-s inspiration, 2-s expiration, 5-s pause cycle breathing pattern from diaphragm location (a–c) and the EIM location (d–f): (a) 500 mL tidal volume; (b) 750 mL tidal volume; (c) 1000 mL tidal volume; (d) 500 mL tidal volume; (e) 750 mL tidal volume; (f) 1000 mL tidal volume.
