|
OF CARDIOVASCULAR DATA |
 |
| |LEVEL 0| |HOMEPAGE| |
|
OF CARDIOVASCULAR DATA |
|
| |LEVEL 0| |HOMEPAGE| |
Least square approximation of time series using a cosine function of known period.
The following function is approximated to experimental data:
where Mesor (acronym for midline estimating statistic of rhythm)
is the mean of the oscillation, A the amplitude, P the prefixed period
and Acrophase the timing of the cosine maximum. In the analysis
of circadian rhythms, P=24 hours.
References:
Smolensky MH, Tatar SE, Bergman SA, Losman JG, Barnard
CN, Dacso CC, Kraft IA (1976) Circadian rhythmic aspects of human cardiovascular
function: a review by chronobiologic statistical methods Chronobiologia
3, 337-370
Massin
MM et al. (2000) Circadian rhythm of heart rate and heart rate
variability. Arch Dis Child.
Tabata
M et al (2000) Cosinor analysis of heart rate variability
in ambulatory migraineurs. Headache.
Lentz
MJ (1990) Time-series analysis--cosinor analysis: a special case.West
J Nurs Res