What Is Heart Rate Exertion (HRE)
HRE (Comparable with Training Impulse) is a parameter to assess Cardiovascular Load. It multiplies time spent in consecutive Heart Rate bands by a weighting factor, where time in higher Heart Rate bands will be weighted more heavily. The Heart Rate bands can be absolute or (more common) relative, meaning calculated as a percentage of the individual’s maximum heart rate.
Internal load (Cardiovascular and Metabolic stresses placed on the body during a bout of work) can determine the overall outcome of an athlete’s subsequent adaptation to stress. Whereas External load represents the work completed. An example of External load would be how much distance they have covered in a session.
In order to calculate HRE, Heart Rate Bands must be set up in the OpenField Cloud, under Bands:
The factor Value then links to each band,
Band 1 - 1
Band 2 - 1.122
Band 3 - 1.322
Band 4 - 1.554
Band 5 - 2.037
Band 6 - 3.252
Band 7 - 5.439
Band 8 – 9.0
To calculate HRE, OpenField multiples the time spent in seconds in each Heart Rate band by the scaling factor.
We must then create a Widget displaying HRE and HR bands and total duration:
From the Cloud Widget, time spent in each HR zone can be altered to seconds from changing the table options into ‘Seconds’:
This will break down the time spent in each HR zone into seconds, the sum of each HR zone Duration will be multiplied against the scaling factor to give the overall HRE.