Chronomics: circadian effects of magnetic storms in rabbits' circulation and transannual variations

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Chronomics circadian effects of magnetic storms
in rabbits' circulation and transannual
variations?

• Sergei Chibisov,
• Germaine Cornélissen,
• Franz Halberg
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  10-12 ??????? 2005 ?., ?. 416-418

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Background

• Biological variables sampled mostly daily with
  variable density (from half-hourly sampling to
  once or twice a day) for 6 or more (up to 36)
  years longitudinally, on the same individual,
  exhibit reproducibly changing chronomes
  (structures in time).

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Background

• Chronomes consist of
• probabilistic and other chaos,
• trends and
• a broad spectral element.

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Background

• Components in the spectral region of about 1.3
  years correspond roughly to the periodicity of
  about 1.3- and/or about 1.6-year length in the
  solar wind, herein called the transyear.

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Background

• Transyears are defined as spectral components
  with 95 confidence intervals for the period
  between 1 and 2 years that overlap neither of
  these two trial periods, nor one another when
  there is more than one transyear (such as in
  human urinary 17-ketosteroid excretion).

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Background

• Thus, there can be two or more distinct
  components in the about-yearly region of
  biological spectra, one or several transyears
  and/or another component of about 1-year length.

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Methods

• The left and right ventricular pressures of
  rabbits were measured at intervals around the
  clock in different seasons.
• The data were analyzed by linear-nonlinear
  rhythmometry for an assessment of any circadian,
  circannual and transyearly variations.

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Methods

• We here summarize two kinds of information, one
  event-related, the other cycle-related.
• The event-related findings consist of the
  statistically significant alteration of the
  circadian acrophase of intracardiac pressure by
  magnetic storms.
• The cycle-related findings consist of the
  detection of a transannual vs. circannual cycle
  in intracardiac pressure of different comparable
  groups of rabbits sampled in four seasons under
  comparable conditions in the laboratory.

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Results

• The circadian acrophase differs with statistical
  significance, with a near-antiphase during a
  3-day span with stormy geomagnetic activity
  versus similar spans during relatively quiet
  conditions in 3 other seasons as well as in the
  same season 4 years earlier, when data collected
  over a single day also differ in terms of MESOR
  and circadian amplitude.

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Results

• Differences in MESOR and circadian amplitude from
  season to season are part of an about-yearly
  variation.
• Acrophases are numerically more tightly clustered
  at the 1.3-year than at the 1.0-year trial
  period, covering 36 vs. 46, respectively (360
  being equated to each of these periods).

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Rhythmometric Summaries
Plt0.001 in all cases for zero-amplitude test of
1.0 and 1.3-year components.
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Discussion

• Data collected over several years will be needed
  to distinguish between the circannual and
  transannual components, notably since the tighter
  clustering of acrophases of the transyear needs
  to be qualified by a larger standard error as
  compared to that of the calendar year.

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Discussion

• Associations of magnetic activity with the
  rabbits' circulation at the circadian and
  transannual frequencies have their precedent in
  the circulation of babies and in human adults'
  blood pressure and heart rate studied
  longitudinally by studies of cross-spectral
  coherence.
• The results await scrutiny by time-varying
  coherence and phase synchronization.

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Conclusions

• The solar wind now and in an evolutionary past
  competed with the seasons in the circulation of
  rabbits and humans.
• Effects of the cosmos can be quantified by
  chronomics.