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Arousal from sleep is a normal physiologic event during normal sleep, which produces a tachycardia-bradycardia pattern on the heart rate variability (HRV) signal, which testifies the involvement of the autonomic nervous system related to a central nervous system event. Repetitive arousals may be associated to excessive sleep fragmentation (for example in respiratory pathologies such as obstructive...
Few authors have used spectral analysis of heart rate variability to characterize cardiovascular control mechanisms during isometric exercise. This technique requires stationary signals and long exercise protocols for different loads, using at least three minutes per load. In this work we explore the use of cardiovascular time-variant spectral indexes during a continuous incremental isometric exercise...
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