One of the simplest body functions to measure is the heart rate or pulse, which is the number of times the heart beats per minute. The normal heart rate, also called the resting rate, can be measured after the patient has rested for 10 minutes. Factors such as age, gender and fitness level come into play when determining a person's normal pulse. Typically, however, an adult should have a resting heart rate of 60 to 100 beats per minute.

The normal heart rate for fetuses is higher than that. Fetal movement can raise the heart rate temporarily. When the mother experiences contractions, the fetus may show a drop in pulse. A range of 120 to 160 beats per minute is considered a normal heart rate while in utero. This can indicate that the fetus is growing well and is not in distress.

During the first year of life, the normal heart rate range expands to 100 to 160 beats per minute. A slightly lower heart rate of 60 to 140 is typical in children aged one through 10 years. Deviations from the normal heart rate for children can be caused by anemia, fever or breathing problems.

Beginning at approximately 11 years of age and continuing into adulthood, the normal heart rate settles at 60 to 100 beats per minute. Athletes often have pulses below this range, with anything from 40 to 60 beats per minute acceptable. If a person is not a well-trained athlete and has a heart rate in this range, however, it could indicate a serious health problem.

The typical resting heart rate is the same for men and women. Gender does come into play in determining the maximum heart rate, which is used to monitor the intensity of physical workouts. To calculate the normal heart rate for men during exercise, subtract the man's current age from 220. The result is the pulse he should strive to maintain while working out. Subtract 88 percent of a woman's age from 206 to determine her maximum heart rate.

Factors such as physical activity, stress and extreme heat can temporarily raise the pulse above the normal range. Excessive weight, smoking and use of certain medications can cause a long-term increase in heart rate. A long-term elevation in heart rate can be cause for concern, just as an exceptionally low heart rate may be. Patients who notice a continued or extreme change in their heart rates should consult their doctors as soon as possible to rule out health issues such as anemia, infection or inflammatory disease.