Cardio Peak Zone

[Rephael14]

Hi, I've started to increase my distance while running every week earlier this March, but the thing is that my peak zone is starting to increase along with it. I've started to run 4 miles for 5 times a week and I'm slowly transitioning it to 6. I feel fine after every time I run, but today, I've reached my peak zone for 46 minutes. Should I be concerned?

[Dominique]

Training in every time zone has specific benefits. What would be worrying would be having a higher HR over time when performing the same activity at the same intensity level (e.g. running 4 miles at 6 mph). If you’re now fitter and able to run longer distances and/or faster, then you would have to reason to worry.

[skylineg35]

Should keep track of your resting hart rate.  It should not increase.  It should get lower as you get better.  Otherwise you may not be getting enough rest.  Better to be little under train then over doing it imo.