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Heart rate variability in deep breathing. The maximal heart rate differences between inspiration and expiration in PASC, POTS, and control patients are presented in box-and-whisker plots (PASC n = 12; POTS n = 6; control n = 7). There was no statistical significance between PASC vs. POTS, PASC vs. control, and POTS vs. control in the t-tests. PASC stands for post-acute sequelae of SARS-CoV-2 syndrome; POTS stands for postural orthostatic tachycardia syndrome.
