Digifit Nation is a curious bunch, and we have had several users wanting to know how Digifit creates the heart rate zones used in the app.
Digifit Nation is a curious bunch, and we have had several users eager to know how Digifit creates the heart rate zones used in the app.
Digifit uses the most common method for determining max heart rate and the corresponding heart rate zones. The method is the Fox and Haskell formula, named after Dr. William Haskell and Dr. Samuel Fox who devised the formula in the early 1970s. The formula is:
HRmax = 220 − age
Therefore, if you are 35 years old your max HR will be 185. Once you have a max heart rate, construction of the the zones comes down to simple math. Each zone consists of a 10% range of your max heart rate. The five zones are:
Zone 1: Warm up/Cool Down= 50-60%
Zone 2: Fitness (Fat Burn)= 60-70%
Zone 3: Aerobic (Endurance)= 70-80%
Zone 4: Anaerobic (Hardcore)= 80-90%
Zone 5: VO2 Max (Max Effort)= 90-100%