Abstract
Clinical signals are obtained when human activity is monitored, usually electronically. Typical examples are brain activity via the EEG, and heart activity from the ECG. Other signals include blood pressure and measures of lung function. The signals can be sampled at short time intervals, such as 0.1 s for measuring autonomic function, or a longer periods such as every 2 hrs for measuring circadian activity. Techniques of analysis include spectral analysis, and time-varying spectral analysis. Examples are given for heart rate and blood pressure variability, the EEG, and human luteinizing hormone levels.
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