Polar HRM question

ls_66

when I plug in my HRM and upload the results I see something like this:
Duration: 00:58:41, HR Avg: 141, HR Max: 169, Calories: 807 Cal, Training Load: 149
what does training load means?

ls_66

no one???

janf15

This may help
http://www.polar.fi/about_polar/press_room/press_releases/training_load_calculation_introduced_in_polarpersonaltrainer_com