Ah, helpful clarification, thanks. Haven’t come across the MAFF/Maffetone perspective.
180 minus age seems like fairly light fare. I haven’t read the MAFF material (yet) but am assuming he recommends longer training periods of lower stress exercise?
My understanding is that max heart rate (subject to wide individual variations around population averages) approximates 220 BPM minus one’s age. Separately, most trainers seem to suggest reaching 80% of your individual max as a “training zone” for cardio improvement and maintenance.
For me, in my mid-60s, my “max” HR ought to be around 155 … but when I engage in bursts of HIIT cardio (e.g., 3 bursts of 20 second duration interspersed within a 10 minute gentle cardio segment as per a number of research papers I’ve read), I typically reach around 140-145 bpm - appreciably higher than 80% of 155.
In short, we’re all different n=1 sample points and population averages are merely that. Will try to make time to learn more about MAFF approach and see if I can learn something. Thanks.