We are giving this program away without any charge, in order to support other researchers who work in the same field of research. But in return we appreciate to be cited if you publish any results calculated with the program.

Please cite as follows:

P. Zuther, S. Gorbey and B. Lemmer, Chronos-Fit 1.06,, 2009.


Chronos-Fit is a program for detection of rhythmic organisation in arbitrary data, which are recorded over a period in time. Originally it was developed for the evaluation of Ambulatory Blood Pressure Monitoring (ABPM) data. However, it has now been expanded to other fields of rhythm research: e.g. measurements of activity in humans, radiotelemetric data of blood pressure, heart rate, activity, temperature etc. in animals and data collected otherwise around the clock. Now it can process any type of data. The program performs a Linear Analysis and a Rhythm Analysis. Linear Analysis consists of conventional parameters like Mean, Standard deviation and AUC. Rhythm Analysis performs a partial Fourier analysis of the data. Moreover, modules for group analysis, power spectrum analysis and actograms are implemented.


Chronos-Fit is distributed in two different ways. An EXE installation file or a ZIP file. Depending on your version you need to do the following.

>Installing the program with the “Chronos-Fit_1.06_Setup.exe” file simply run the EXE file and follow the instructions.

>Installing the program with the ZIP-file open the file with an unzipping program (e.g. UltimateZip or WinZip), then create your desired installation directory (e.g. “C:\Program Files\Chronos-Fit”) and copy all files in the ZIP file to this installation directory. You can also create a link from “Chronos-Fit.exe” to your Windows Start button (e.g. by dragging “Chronos-Fit.exe” to the desired location).

After installing the program and starting it for the first time you will be asked to fill out a registration form. Your details will be send to us and you will receive the registration file needed to run the program via email.

A manual can be downloaded separately.


We would like to keep track of people using the program. Therefore a free registration of Chronos-Fit is mandatory. In order to register the program send an e-mail with your name, company, city, country and e-mail adress to You will receive an e-mail with the file 'abpm.cfg' attached. Copy this file to the installation directory of Chronos-Fit (e.g. 'C:\Programs\Chronos-Fit'). Chronos-Fit will start without reminding you to registrate the software.