CIRCANNUAL VARIATION IN HUMAN DIASTOLIC BLOOD PRESSURE DURING CONSECUTIVE SOLAR CYCLES.

Putative circadecadal modulations of a circannual variation in diastolic blood pressure are explored in a still accumulating 35 year record of self-measurements by a clinically healthy man. Analyses of monthly means by gliding spectra, one-way analysis of variance (ANOVA), and cosinor were carried out after removing data collected during travel across time zones or during illness. An about yearly change in diastolic blood pressure may or may not be detected with statistical significance by cosinor or ANOVA, apparently as a function of solar cycle number and/or stage.

MOVING LEAST SQUARES SPECTRA SCRUTINIZE CHRONOMICS IN AND AROUND US.

As an extension of the chronobiological serial section, gliding spectra illustrate the changing time structure (chronome) of physiological, physical and/or other variables in a given frequency range. For this purpose, least squares spectra are computed over a specified interval (much shorter than the observation span) that is progressively displaced by a given increment throughout the entire record. Results can be displayed either as 3D charts or as surface charts, displaying the estimated amplitudes, percentage rhythms or ordering P-values at each trial period for each interval.

Chronomics of tree rings for chronoastrobiology and beyond.

Gliding spectral windows illustrate the changes as a function of time in the relative prominence of signals in a given frequency range, viewed in 3D or as surface charts. As an example, the method is applied to a 2,189-year series of averages of ring measurements on 11 sequoia trees published by Douglass. Analyses of the original data and after filtering reveal, among others, components with periods of about 10.