That’s where pulse oximeters come in. These small devices measure your heart rate and SpO₂. They give you another way to understand how your body responds during exercise and recovery. Also, they may ...

Pulse oximeters were a critical part of life-saving care during the COVID-19 pandemic, shaping treatment by measuring oxygen levels in the blood. The devices, which became common in the 1980s, have ...

Over-the-counter pulse oximeters, available online for as little as $14.99, use similar technology but are largely unregulated. So, too, are Apple Watches and other fitness gizmos that often include ...