Heart Rate Variability and performance

In the latest study using HRV4Training to look at the relationship between acute changes in HRV (your daily value, with respect to your normal range) and performance, Justin DeBlauw and co-authors have found that "Daily HRV monitoring provides valuable insight that an individual’s peak power and speed may be compromised during cycling performance"

In particular, performance metrics such as peak power and speed, were lower when performing time trials on a day in which HRV was outside of the participant's normal range

Check out the full study, titled "Association of Heart Rate Variability and Simulated Cycling Time Trial Performance", at this link