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Comparison of Baseline-Supine and 60° head-up tilt (HUT) cardiorespiratory dynamics in control and chronic fatigue syndrome (CFS) subjects showing mean blood pressure, heart rate in beats/minute (bpm), respiratory rate, and end-tidal carbon dioxide (ETCO2). Data are shown as means ± SE. *Significantly different comparing Baseline-Supine to HUT (P < 0.05); ‡significantly different comparing control to CFS (P < 0.05).
