Glossary
Acrophase |
Phase angle corresponding to the maximal value of the rhythmic parameter studied |
Circadian |
Period of oscillation is 24 ± 4 hours |
Cosinor-analysis |
Nonlinear regression procedure (applying a parameterised cosinus equation to the raw data series) |
Degree of Functional Coupling |
Percentage of the circadian component and harmonic ultradian components in relation to all significant rhythmic components of a spectrum based on the respective relative parts of their assigned variance |
Harmonic periods |
Period lengths are integer dividers of 24 h |
Harmonic portion |
Percentage of the number of the circadian and their harmonic ultradian components in relation to the number of all significant periods smaller or equal to the circadian rhythm |
Infradian |
Period length of oscillation is more than 28 hours |
MESOR |
Mean of oscillation of cosinor analysis |
Motility |
Swimming velocity in video-pixels per second |
Number of turns |
Number of changes of the direction per second |
Phase-shift |
Displacement of an oscillation along the time axis |
Polar Plots |
Graphical presentation of amplitude and acrophase |
Power spectral analysis |
Fourier transformed autocorrelation function for quantification of the harmonic frequency structure of activity rhythms |
Ultradian |
Period length of oscillation is less than 20 hours |
Zeitgeber (time trigger ) |
Forcing oscillation which entrains a biological rhythm |
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