Terms Related to Biological Rhythm, Mesor

Term/Abbreviation	Description
CORRELATION: r	Indicates the degree of linear relationship
(Coefficient of Correlation)	between two variables. It ranges from +1 to
	-1. A correlation of +1 means that there is a
	perfect positive linear relationship between
	variables.
Sys – dia	In the plotted 24-hour blood pressure data,
	indicates high blood pressure using the limits
	of the systolic and diastolic blood pressures.
Sys – pul	In the plotted 24-hour blood pressure data,
	indicates the degree to which the pulse and
	the systolic blood pressure are related.
Reg. Line (Regression Line)	A line drawn through a scatterplot of two
	variables so that the line comes as close to
	the points as possible.
Histogram	A graphical representation of a frequency
	distribution by means of rectangles.
	The widths represent intervals. The heights
	represent the number of observations
	occurring in each interval.
F	Full analysis
P	Partial analysis

5-3 Terms Related to Biological Rhythm

Term/Abbreviation	Description
Cosinor (Cosine Vector)	Circadian	rhythm	analysis	method
	introduced by Halberg et al (1967).
	In Cosinor, twenty-four hours are plotted
	on. Acrophase and Amplitude of Acrophase
	are indicated on an r-axis.
	95% confidence interval is used. If the
	interval does not include the origin, the data
	is interpreted that a statistically meaningful
	rhythm exists. If the interval includes the origin,
	the data is interpreted that the significance level
	is 5% and the rhythm is rejected.
MESOR	Indicates the objectively-expressed mean
(Midline Estimating Statistic of Rhythm)	value of the circadian rhythm, with no bias
	due to the considerations on the difference
	of the day and night sampling numbers,
	and the difference of the day and night
	sampling intervals.
	More accurate ABPM mean value when the
	sampling intervals are not constant.
Amp. Amplitude	Amplitude of a cosine curve best fitted to
	the biological rhythm data.
Acrophase	Phase that represents the maximum value
	of a cosine curve best fitted to the biological
	rhythm data. For example, an acrophase
	indicates a time duration in which the
	highest systolic blood pressure is obtained.
			Continued