Pulse oximeters are widely used in hospitals and clinics to monitor blood oxygen levels. These small, noninvasive devices ...

While most people mark their age by the number of birthdays they've celebrated, scientists have long known that the body's organs do not all age at ...

How low can a human resting heart rate go? A low resting heart rate is often a sign of good cardiovascular health, but just how low can it drop?

You probably don't think all that much about how quickly you breathe, but it can actually tell you quite a lot about your overall health. Respiratory rate is considered one of four main vital signs, ...

For 540 million years, Earth’s magnetic field has correlated with fluctuations in atmospheric oxygen, according to a newly released study.