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Figure 4c: (a,b) Scatter plot of rest period duration of (a) LCA and (b) RCA plotted against individual heart rate. Only weak linear correlation was found for the LCA, as well as for the RCA. Dashed lines are heart rate limits for patient subgroups. The tendency for longer rest periods in patients with lower heart rates and for shorter rest periods with higher heart rates can be appreciated. However, the majority of patients with heart rates of 60–90 beats per minute showed no obvious correlation between heart rate and rest period duration. (c,d) Box-and-whisker plots show relationship between individual heart rate and duration of (c) LCA and (d) RCA rest periods. If heart rate was less than 60 beats per minute, LCA and RCA rest periods were significantly prolonged (*) (P < .01). If heart rate was more than 90 beats per minute, a tendency toward shorter rest periods was recognized.
