Wavelet analysis of circadian and ultradian behavioral rhythms

Wavelet analysis of circadian and ultradian behavioral rhythms

: We review time-frequency methods that can be useful in quantifying circadian and ultradian patterns in behavioral records. These records typically exhibit details that may not be captured through commonly used measures such as activity onset and so may require alternative approaches. For instance, activity may involve multiple bouts that vary in duration and magnitude within a day, or may exh...

Circadian and Ultradian Clocks/Rhythms

Glossary Circadian biological rhythms of approximately 24 h in duration. Clock something that is used to measure time. Chronotherapeutics treatment protocol for cancer whereby the time of day that chemotherapy is administered is chosen in order to be maximally effective in treating the tumor, but have minimal effects on the patient. Entrainment the process by which an environmental stimulus reg...

Circadian and Ultradian Rhythms Modulating the Sensory Processing

The present review analyzes sensory processing during sleep and wakefulness from a single neuronal viewpoint. Our premises are that processing changes throughout the sleep– wakefulness cycle may be at least partially evidenced in single neurons by (a) changes in the discharge rate and firing pattern of the response to sound, (b) changes in the phase locking of the response to the hippocampal th...

Normative values for circadian and ultradian cardiovascular rhythms in childhood.

To assess the prevalence and characteristics of physiological circadian (24-hour) and ultradian (12-, 8-, and 6-hour) rhythms of mean arterial blood pressure (BP) and heart rate (HR), we analyzed 24-hour ambulatory BP profiles from 938 healthy school children aged 5 to 18 years. Cosine harmonics were fitted by Fourier analysis, and an amplitude and acrophase (time of peak) were calculated for e...

Ultradian Rhythms Underlying the Dynamics of the Circadian Pacemaker