Results have recently been published from a study of collegiate athletes at the University of Connecticut's Korey Stringer Institute.
The study examined resting heart rate (RHR), heart rate variability (HRV) and percentage of time in slow-wave sleep (SWS) in female cross-country runners over the course of an entire season, looking at the changes in each metric and the relationships between them.
To collect the data, the participating athletes wore WHOOP 24/7.
Findings indicated a correlation between higher resting heart rate, lower heart rate variability, and a greater percentage of time spent in slow-wave sleep.
What does this mean? When the athletes’ bodies were run down physically during the more strenuous parts of their season, as indicated by an increase in RHR and a decrease in HRV, they spent more time in the restorative stage of sleep, SWS.
The study’s findings show the ability of WHOOP to accurately measure these metrics, as well as how we can use them to promote recovery and improve athletic performance.