Heart rate correlates strongly with exercise intensity.Most middle-age adults have a resting heart rate of about 70 to 75 per minute and a maximum of around 180.Athletes often have much lower resting heart rates -- in the 40s is not unusual -- because their hearts pump more blood with each beat, allowing the same cardiac output at a lower pulse rate.How fast your pulse returns to normal after exercise depends on your fitness, age and genetics.Determinants of Resting Heart Rate
Adult men have slightly lower resting heart rates, or RHRs, than adult women, according to a 1999 study in "The European Heart Journal." For both sexes, people with higher blood pressure tend to have higher RHRs.Shorter people have higher RHRs than taller people.Men who smoke more cigarettes or consume more alcohol have higher RHRs than more moderate users of these substances.Men with lower phosphorus levels, higher protein levels and higher alkaline phosphatase levels all tend to have slightly higher RHRs.Thus a 44-year-old man near the median in all of these categories would be expected to have a RHR close to 73.
Maximum Heart Rate and Age
You can measure your maximum heart rate, or MHR, directly if you have a heart rate monitor, or you can estimate it using any number of formulas.According to Brian MacKenzie, a coach with UK Athletics, the cla*sic formula, 220 - age, is more accurate for men than it is for women, and has been supplanted by more reliable formulas.In 2007, U.S.researchers identified the formula 206.9 - (0.67 x age) as the best predictor, while U.K.scientists settled on 202 - (0.55 x age).In any event, a 44-year-old man's predicted MHR lies in the range of 175 to 180.
Heart Rate Immediately After Exercise
Whatever the values of your maximum and resting heart rates, how quickly your heart rate declines after stopping exercise depends on your fitness, overall health and how hard you exercise.A 1999 study in "The New England Journal of Medicine" found that in the first minute after subjects exercising on a treadmill stopped, their heart rates dropped by an average of 17 beats per minute.Therefore, a typical 44-year-old male exercising at 85 percent of maximum intensity, as measured by heart rate, would be expected to have a heart rate of about 136 after one minute of rest, based on the calculation of 0.85 x 180 - 17.
Heart Rate in the Hours After Exercise
Although heart rate declines quickly in the seconds and minutes following a bout of exercise, a full return to RHR can take up to an hour after light or moderate exercise, four hours after sustained aerobic exercise, and one full day after intense or all-out exercise, such as running a marathon.A faster return to RHR is typical of physically fit people, whereas a slower return to RHR is a*sociated with diseases such as diabetes and a higher risk of mortality from adverse cardiac events.
Daftar 47 Merek Susu yang Bebas Bakteri E.sakazakii
