I have been running seriously for about 6 years now and have done 10 HM races. My age is 54 and my max HR is about 175 and RHR sits as low as 32 when I am relaxed. I tend to run 75% of the time at an aerobic pace with HR in the 130 - 135 range. Once a week I go with a younger colleague and its more high intensity. between 5 - 9 mile runs usually at a much quicker pace than my more relaxed runs, but you need some high intensity right?
Last night we did a 5 miler and I averaged sub 8 min miles (good for me) but HR was averaging 159 over the whole run and peaking out at 175. I am training for a HM in spring and would love to be able to average sub 8 min miles but am worried that doing 13.1 miles at this sort of pace could be to much. Is it?
I have done HMs as I said but its only recently that I have had the luxury of being able to monitor HR regularly.
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But there's no reason that with training you could improve on your HM PB. Lots of slow aerobic training runs and some faster work too. You don't say what your weekly mileage is, you may need to increase that to improve your endurance.
And if you train properly then you train your heart too and you are more likely to reach your goal time without any distress.
I just put on the RW race calculator your 5 mile run, with a time of 39 minutes and it forecasts that you could do a half in 1:48, so that's a very achievable target for you.
https://www.runnersworld.co.uk/rws-race-time-predictor
If your are healthy as said train and enjoy.
I didn't realise you had a wrist sensor HRM, they are not as accurate as a chest strap and you will get random readings. They are accurate at rest but not during exercise.
That's a good run on the treadmill, you can certainly get that HM PB next year
Enjoy your running, you're doing really well.