for someone in their 40s, because maximum heart rate declines as we get older. The rough rule of thumb for estimating your age-predicted maximum heart rate is to subtract 0.8 times your age from 214 for men, or subtract 0.9 times your age from 209 for women
be lower than 60 per cent. In my own laboratory weve measured heart rates at the lactate threshold ranging between 140 and 185 in a group of male athletes in their 20s; this ranged from 70 per cent to 90 per cent of their MHR. I suspect that the reason
