Fig 6.

Scaling analysis of heartbeat time series in health, aging, and disease. Plot of log F(n) vs. log n for data from a healthy young adult, a healthy elderly subject, and a subject with congestive heart failure. Compared with the healthy young subject, the heart failure and healthy elderly subjects show alterations in both short and longer range correlation properties. To facilitate assessment of these scaling differences, the plots are vertically offset from each other. Adapted from ref. 19.