Apple Watch Series 9 VO2 Max and Respiratory Health Review: Cardio Fitness Tracking for the General Population
Apple’s most popular wearable brings VO2 max estimation and respiratory rate tracking to hundreds of millions of wrists, democratizing a longevity metric that once required a laboratory visit. The challenge of population health has always been reach. A clinical VO2 max test costs $150 to $300, requires a specialized facility, and takes 30 to 45…
