The liquid is applied on the mother s belly that would let the sound waves to travel from the heart of the baby across the belly through the monitor. The doppler fetal heart rate monitor can be used on expectant mothers carrying as early as 10-12 weeks old fetus to the moment you are about to give birth. This is not bad of course, especially if we only need is a device that would tell us the time. But for runners, athletes, and trainers, a simple time-telling device wrapped around the wrist would not do. Because for them wristwatches are not enough. They need something that could give them the exact status of their heart while on training. This would mean that the heart rate monitor determines how fast, how long, how hard and how much effort the user should exert in order to meet the targeted workout program. And no other exercise equipment could do that except a heart rate monitor. Another unique feature of a heart rate monitor that surpasses the ability of a private fitness instructor is its capability to count the number of calories burned during the whole exercise plus the capacity to estimate the percentage of the fat burned. Treadmill and the Treadmill Heart Rate Monitor With the increasing concerns to stay fit, many Americans would give their body the chance to shake those sleeping reactivated and shred some pounds every time they tip their weight. This is the reason why people exercise and the first type of exercise they do is running. There are two components of a heart rate monitor: the wrist display and the chest strap. Both should fit to your body well and both should be able to work together by properly submitting data from the chest strap to the wrist display. Some are heart rate monitors are coded some are not. A good heart rate monitor is coded for it does not interfere or is not prone to interference to other monitors which could result to inaccurate readings. Accuracy: If you are using your fingers to know what is your current heart rate, you are probably having a difficult time determining your precise heart rate. With the heart rate monitor, you can determine your current heart rate more effectively plus the ease of eliminating the hassle of counting your heart rate with your fingers against time.