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. 2016 Jan 22;6:19947. doi: 10.1038/srep19947

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Copyright © 2016, Macmillan Publishers Limited

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Frequency obtained by using the fast Fourier transform (FFT). The graphs (a–e) correspond to the data shown in Fig. 7a–e, respectively: no one on the tatami (a), the examinee on the tatami in a prone position with 10-s periodic breathing (~4 s for suction, ~2 s for delivery, and 4 s for apnoea) (b), a prone position with 6-s periodic breathing (~3 s for suction and ~3 s for delivery) (c), a supine position with 10-s periodic breathing (~4 s for suction, ~2 s for delivery, and ~4 s for apnoea) (d) and a supine position with 6-s periodic breathing (~3 s for suction and ~3 s for delivery) (e).