Cardiovascular autonomic function analysis using approximate entropy from 24-h heart rate variability and its frequency components in patients with type 2 diabetes.

Both ApEn curves from the LF component of the two groups showed a trend of first rising then decreasing during the daytime period, which is in line with what would be expected in human physiology: during daytime hours, activity levels are greater, the sympathetic nervous system is dominant and cardiovascular system activity is more complicated.

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