I'm in my mid-40s and I do cardio 3x weekly, and during my sessions, it's basically HIIT training. I try to keep my HR above 150 during my sessions, but it peaks in the low 180s intermittently.
Is this okay? My doctor noted potential concerns with getting my HR up that high, but it could be fine, she wasn't sure. I don't get any dizziness or anything (generally that happens if I sustain a heart rate above 185 for a bit). I'm not staying at 180 bpm, that's just the peak, I'm targeting an average HR of around 150-155 for my workouts.
In a 60 minute workout, I'll probably spend 10-15 minutes with my HR between 166 and 182 range.
Not sure if I should scale it down a bit or take it easier, or if this is fine.
I'm curious what your resting heart rate is?
I'm not sure which is the correct measurement.
According to my Garmin watch, my resting heart rate is 49 bpm over the last year average, and 48 bpm in the past month.
You're fine with that resting. One thing to note is that if you're low carb or exercising fasted, the heart runs better on ketones (cleaner fuel) but has more work to do (fat->liver->ketones->muscles and direct fat->muscles instead of in-situ glycogen->muscles) so runs about +10BPM in cardio. Known phenomena and actually a good sign heart health wise.
Good to know. I'm not doing keto, but I have a relatively low carb diet because I'm a type 2 diabetic (well controlled, IIRC my last A1c was 5.7). I exercise in the afternoon/evenings, so never fasted.
If you want the nitty gritty (or feel the need to convince a doctor) check out "The Art and Science of Low Carbohydrate Performance" by Phinney and Volek. Pretty much the bible on the subject. Fair warning, technical, but a good reference.
Thanks for making me look, turns out there's a "The Art and Science of Low Carbohydrate Living" now that I'll be checking out, might be more accessible. Ignore the overheated blurb on the back, these guys are serious scientists, seems their publishers are not.
Your resting hr looks good. Do you keep track of your blood work I.e. cholesterol, triglycerides, a1c, salt intake, highly processed foods, ldl and hdl levels. If you're concerned consult a cardiologist. Your primary should be tracking all of that, but if not request a lipid panel. Also how are your stress levels, do you practice any meditation? Do you get enough sleep? All of these can affect your heart health.
I do, but not all frequently. I'm a T2 diabetic, so I'm generally on top of my glucose levels, but the lipids I only check annually. LDL is good, HDL is usually slightly lower than I'd like, triglycerides have varied, sometimes good, sometimes really bad, seems entirely dependent on what I've eaten before my blood work. I have a lipid panel and other stuff coming up this week.
Salt intake is low, I don't avoid it or seek it in my diet. Most of the seasonings we cook with are salt free.
Sleep is fine. I have sleep apnea, but use a CPAP without issues and my numbers are great, and I generally get around 7 hours a night, sometimes more on weekends. Stress levels... uh, probably worse than normal given *gestures wildly at everything* but generally good. I'm a somewhat high-strung individual, but I've worked a lot on my anxiety and triggers over the years.
It sounds like you're doing the right stuff. The only other advice I can give is to work on stress and try not to keep it inside. Also keep track of blood pressure. I brought all of this stuff up because I didn't pay attention to my stress and paid the price last year when I had a heart attack. All of my numbers were good, but I keep my stress inside and have a lot of anxiety and it caught up to me. If you have any chest pain even if it seems minor, talk to your doctor about it and if you have any kind of indigestion issues that are persistent also talk to your doctor. We're all different and my issues may not be yours, but if something isn't feeling right talk to your doctor.