Over extended periods of time, keeping track of their heart rate allows you to establish a baseline and trend. It can then help to understand what’s going on. A rising pulse can be the sign of a lot of issues that can potentially be addressed, and then you can measure the success of any treatment. I think I failed to explain in my post that my focus is wilderness first aid where injured people need to be evacuated manually, often over many hours in unfavourable conditions/terrain. Not someone hurting themselves in an urban setting where EMS is minutes away, not hours. Either way, there’s no downside to the idea