Readiness Score

The score is built from two signals: your resting heart rate and how long you sleep. Both were chosen because a large meta-analysis has measured how each one relates to mortality, so the arithmetic can be traced to a paper rather than to a weighting we picked. Pooled cohorts covering 1,246,203 people put every 10 beats per minute of resting heart rate at 1.09 times all-cause mortality (Zhang 2016). Pooled cohorts put sleep at its lowest risk around 7 hours, rising 1.06 times for each hour below and 1.13 times for each hour above (Yin 2017). A score of 100 means these signals sit at the reference; a lower number means they carry that much more. Heart rate variability and deep sleep are shown next to the score but do not move it. Resting HRV has been found to rise both when fitness improves and when someone is overreaching, so one reading cannot tell those apart, and there are no population norms for wearable HRV to place you against. Deep sleep has normative values by age but no link to a health outcome to weight it by. Each value is the median of your most recent days with data rather than a single night.

— PaceSovereign Glossary