Adenosine triphosphate (ATP) is the biochemical way to store and use energy. F or your muscles -- in fact, for every cell in your body -- the source of energy that keeps everything going is called ATP.
An approximate blood oxygen level can also be estimated using a pulse oximeter â a small device that clips on your finger. Though the pulse oximeter actually measures the saturation of oxygen in your blood, the results are often used as an estimate of blood oxygen levels.Normal pulse oximeter readings range from 95 to 100 percent, under most circumstances. Values under 90 percent are considered low.1  Causes.n approximate blood oxygen level can also be estimated using a pulse oximeter â a small device that clips on your finger. Though the pulse oximeter actually measures the saturation of oxygen in your blood, the results are often used as an estimate of blood oxygen levels.
Pulse Oximeters are devices that are typically slipped onto the finger to read a persons heart rate and measure oxygen blood levels. They may also be slipped onto the toes, nose or earlobes.A pulse oximeter works by shining an infrared light through your body tissue onto a photo sensor. Pulse Oximeter will also display a heart rate reading. Healthy heart rate readings depend on your age. For elderly persons over the age of 70, a heart rate in the region of 90 beats per minute is considered a normal level. A healthy pulse rate for adults aged 18-70 falls anywhere between 60 and 80 beats per minute.