HRMs can be great tools, but you don't need one to lose weight. Here's the thing, most people want the "calorie burn" feature in an HRM. That is only available on the higher end models.
You could buy a lower end model, but it might not give you a calorie burn. It might just tell you where your HR is. Which is what it was intended to do. HRMs were primarily used by athletes as a way to increase their fitness levels by tracking their heart rate.
The model I have does not track calories. Which is fine since I never wanted to track them anyway.
In using the HRM, I found my heart rate is all over the places. So, I rarely wear it anymore. These days, I tend to favor rate of perceived exertion over an HRM. it's certainly cheaper. LOL !!!
RPE is a much easier way to track how your heart rate is during exercise.
Example, if you can talk and run at the same time, you're working in the 60-70% of max range. It means you're working aerobically i.e. getting plenty of air.
Now, if you're working out so hard that you can't talk, that you are a bit breathless, then you're working anaerobically i.e. without air. those are your short bursts of power and speed.
That's all an HRM really does i.e. measure your heart rate. the fancy ones with the extra bells and whistles will measure calorie burn.
Is it necessary ? it's nice to have, but it's not necessary to lose. I lost all my weight without one.
I love the 'fitness' test on it that is supposed to be similar to a Vo2 reading. It seems to work. When I was doing really well, it kept (every few months) telling me I was doing better and better. Then after a major (long.....long) relapse, it now tells me I such again -- LOL
"All things can be done for the one who believes." Mark 9:23
“Even if you are on the right track, you’ll get run over if you just sit there.” --Will Rogers
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