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The Pulse
The pulse is felt in the body’s blood vessels and reflects the heart’s beat. The heart rate and the pulse are the same rate in most instances. The pulse is felt with a slight delay after the heart rate, with those pulses farther from the heart, such as in the foot, taking longer to pulsate. In abnormal situations, the heartbeats are ineffective and don’t pump as much blood, such as in some arrhythmias, giving a different heart and pulse rate. In other cases, such as a condition called atrial fibrillation, the heart’s electrical system produces a “beat” in the heart without causing a mechanical beat felt in a pulse, also giving different measures.
The pulse can be measured from your fingertip or earlobe with a pulse meter. These devices contain a photoelectric cell sensor. Because indoor and outdoor light and body movement can interfere with these devices, pulse meters are often not as reliable (as direct assessment of the heart rate from the chest) during physical activity but are useful during rest or on stationary devices. However, quick reductions in heart rate occur when physical activity is stopped, giving inaccurate training rates.
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Taking a patient’s pulse is one of the first clinical tools taught to all healthcare professionals. Its primary purpose is to assess the heart rate, reflected in various pulses felt on the body, to ascertain whether the rate is too rapid or too slow, the quality of the rhythm, its strength, and, of course, whether the patient is alive. In Chinese medicine, pulse diagnosis is a very important component in evaluating overall body function. As a student, I also learned various other important uses for taking a pulse, including measuring the body’s response to certain stimuli. For example, placing your hands in cold ice water, a long-standing evaluation used in Western medicine and research—called the cold pressor test—usually raises the pulse rate, much like when you watch an action or adventure movie, walk a flight of stairs, or are exposed to other forms of stimulation. These typically raise the pulse rate in some predictable fashion, while resting without the same stimulation lowers it.
From my first day in practice, I tested patients’ pulses as part of my initial evaluations. This was also important during exercise tests of various types in my office and when monitoring the pulse rates of athletes before, during, and after their workouts.
Question:I have a lot of trouble with my Polar heart-rate monitor. I often get “00” as a reading. It comes and goes during my workouts. As I have really improved my fitness, I want to continue using the monitor. Polar is no help at all. They won’t even answer my e-mail.
Answer: I can sympathize with you on companies not responding. Sometimes moistening the monitor strap where it contacts your chest is helpful. And sometimes making it a bit tighter can help too. It almost sounds like there’s a technical problem in the watch. You might ask the folks at Running Ahead: www.Running-Ahead.com/groups/LOWHRTR/Forum. This is an open online forum of athletes; they are knowledgeable about heart-rate monitors, use all different kinds, and are very responsive.
