# Polar

The Polar system is used for monitoring heart rate. After data acquisition the data can be transferred to a computer (not available with all Polar systems). The data is stored in a HRM file. These HRM files can be directly imported into EthoVision XT.

EthoVision XT cannot be connected to the Polar system. Therefore, Polar heart rate data and EthoVision tracking data always need to be synchronized manually.

To facilitate manual synchronization of Polar heart rate data and tracking data you can do the following:

▪If the Polar software is running on the EthoVision XT computer: Synchronize the Polar watch with the clock of the EthoVision XT computer.

Please see the Polar Precision Performance software Reference Manual for a description of how to do this. Please note that this is not possible for all Polar systems.

▪If the Polar software is not running on the EthoVision XT computer: Synchronize the EthoVision XT computer and the Polar computer. Synchronize the Polar watch with the clock of the Polar computer.

The settings on the Polar receiver determine what header information is written to the HRM file. Please refer to you Polar manual for a detailed description of the settings.

Below: An example of part of a Polar HRM file.

The file header contains information about date and time, the length of the recording period (00:12:54:08) and the sample interval (5 sec). It also contains information about settings of the upper and lower limit of the heart rate.

Depending on the settings of the receiver, the HRM file can contain additional information. This does affect subsequent import of HRM files acquired with different type of receivers.

The HRData column show the mean heart rate (in beats per minute) over a 5-s period.

Polar Precision Performance 4.01 (no date - time)

This is an example of the Import Profile Definition window in EthoVision XT for the profile Polar Precision Performance 4.01 (no date - time) obtained with the Polar file described above.

Note that in the Data definition section the cells under Start Date and Start Time are empty, meaning that the import profile does not read date and time information in the Polar file.

Polar Precision Performance 4.01

This is an example of the Import Profile Definition window in EthoVision XT for the profile Polar Precision Performance 4.01 obtained with the Polar file described above. This profile reads the date and time information contained in the export file header.

Note that in the Data definition section the cells under Start Date and Start Time contain the information read from the Header section (the corresponding cells in the Header section are grayed out).

Interbeat interval data

Interbeat interval data obtained with a Polar system have the same format as HRM data. However, the file does not contain the time stamps that EthoVision XT needs for time information.