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. 2022 Jul 13;10(13):e15389. doi: 10.14814/phy2.15389

FIGURE 2.

FIGURE 2

Normal‐to‐normal (NN) beat intervals in the control and sleep deprivation (SD) groups before and after 4‐7‐8 breathing control. Data are presented as mean ± standard deviation. *Significant difference compared with before 4‐7‐8 breathing control (p < 0.05).