A decreasing trend can be observed for cluster −/+ in Figure 6 c.
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Unsupervised Clustering of Heartbeat Dynamics Allows for Real Time and Personalized Improvement in Cardiovascular Fitness.
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In Figure 6 d,e, frequencies for both +/− and +/+ clusters present an increasing trend from the “start” section to the “end” section: cluster frequencies in the “end” section are significantly higher than “start” and “middle” section.