Exactly! However if you aren't going to do an individual max, remember that the 220-age formula has a standard deviation of about 10-12 beats per minute. Thus if you took a 40 year old (age predicted max 180) then about 95% (2 std. Dev.) would fall between 160-200; Quite a large range. Take a look at the American College of Sports Medicine (ACSM) or an exercise phys. Textbook e.g. McArdle WD, Katch FI, Katch VL (2001): Exercise Physiology. Energy, Nutrition and Human Performance. 5 ed. Lippincott Williams and Wilkins Dave r -----Original Message----- From: - for physiotherapists in education and practice [mailto:[log in to unmask]] On Behalf Of Robert Stålebring Sent: 05 September 2003 22:02 To: [log in to unmask] Subject: Re: heart rate calculation Martin! All "calculations" for MHR are of course inaccurate. MHR has to be tested for individually, but this is a max-test and it is not suitable for everyone to perform (obviously). Robert Sweden