Why does my heart rate vary drastically day-to-day during cardio?
April 19, 2006 9:10 AM Subscribe
Why does my heart rate vary drastically day-to-day during cardio? 120 one day then 160 the next under same conditions.
posted by wolfkult to health & fitness (12 answers total)
I go to the gym around 3 days a week and always use the elliptical machine for 25-40 minutes. It has one of the usual hand heart rate monitors. I typically use the same resistance/incline/strides-per-min, but some days my heart rate is much higher. For example, it is usually around 110-120/min, however, today it was 150-160/min. I'm not really complaining, on days like this it is a lot easier to break a sweat, but why does heart rate vary so much day to day?
I can think of a few reasons like diet (but what?) or drugs (nothing illegal, caffeine or ephedrine, but I'm not sure those would make it so drastic).
Just for the record, I'm a 25 year old male.