I would like an approach to use the data heart rate + pace from a run to give me a factor that will help me see my improvements on different runs. For example, if I have run at a pace of 5:30 with an average heart rate of 160, I think it is better than if I have run at a pace of 5:14 with an average heart rate of 185. And a pace of 5:14 with a heart rate of 160 would be the best of the three.
Is there any formyla or do you have any suggestion on how to assess this? Something more elaborate than 1/(pace+(heart rate*2))?