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Figure 1 Differences in the circadian pattern of systolic and diastolic blood pressure, heart rate, and activity between the first and the second day of a 48-h ambulatory blood pressure monitoring (ABPM) in untreated patients with mild-to-moderate hypertension measured for the first time. Each graph shows the hourly means and standard errors of data collected during the first (continuous line) and second (dashed line) day of monitoring. The nonsinusoidal-shaped curve represented for each day corresponds to the best-fitted waveform model determined by population-multiple-component analysis (with corresponding characteristics given in the table below each graph). The arrows descending from the upper horizontal axis point to the circadian orthophase (rhythm’s crest time) for each day of monitoring.