Doing a LT test will give you the information you need. In a number of weeks re-evaluate.Yeah Lt is a better gauge though I am only using HR at the moment.
I will eventually move to Lt but right now HR is my best gauge. I am coming off a decent time of been very sedentary so i don't want to go out 100% with a LT test. But in 6 weeks I will re-evaluate where Im at and will more than likely do a LT test.