Results and Data

VO2 max is the best measure we currently have for cardiovascular fitness. It quantifies how many milliliters of oxygen you can extract from the air per kilogram of body weight per minute during intense exercise. See Exercise for more information.

Max HR represents the highest possible number of heartbeats per minute one can achieve during maximal exertion. For most, a higher max HR indicates a higher fitness level. It also can be a valuable tool to gauge workouts are sufficiently intense.

RHR represents the number of heartbeats per minute at complete relaxation. A lower RHR indicates a more efficient heart, in part due to increased stroke volume and improved oxygen utilization.

HRV refers to the variation in time intervals between consecutive heartbeat, measured in milliseconds. A higher HRV indicates a more adaptable and resilient heart. 

I do this test 1-2 times a month on a treadmill. I wish I had more historical data, as I distinctly remember struggling to run an 9 minute mile in high school.

I am somewhat skeptical of the precision of this measurement and very skeptical of it's accuracy (what's the difference?). I suspect it uses my body weight and a simple formula to calculate this value. 

These values exclude the time I'm trying to fall asleep (not sure how long this is on average) and the duration of time I'm awake during the night (usually within 0-20 minutes).

Deep sleep is the stage of sleep where the body experiences the most restorative processes. Higher amounts of deep sleep are associated with improved sleep quality.

REM (Rapid Eye Movement) sleep is the stage of sleep where dreaming occurs and the brain processes memories and emotions. There is no clear answer on how much REM sleep is inherently best; we know that values that are too high or too low may be problematic.