The Crickles Navigator has a new Summary tab giving headline figures for the athlete and a comparison of each with peers. Currently, there are six figures shown in the Value column:
Period CSS shows the total Cardiac Stress Score for the period defined by the Date range. This period defaults to the last six weeks but can easily be changed in the side panel.
Period XSS extends this measure to cover also activities on Strava for which there is no heart rate data. The estimate of cardiac stress is less good than CSS, which requires a heart rate monitor, but better than assuming that it’s zero. If you always wear a heart rate monitor CSS and XSS will be equal (though not for the peer group). If you never wear a heart rate monitor, CSS will always be zero but XSS will usually be positive.
Current LTHR is the latest Crickles estimate of your Lactate Threshold Heart Rate. (Occasionally this estimate may lag one activity behind your last effort.) This only appears if you use a heart rate monitor.
Current Fitness, Fatigue and Form are as described here. Since they are current estimate, neither these values nor Current LTHR change as you change the Date Range.
The numbers alongside these in the Crickles Percentile column show how you compare to the Group chosen in the side panel (by default, the entire Crickles population). If the Crickles Percentile is 100 you have the highest value. If the Crickles Percentile is 50 you’re on the median.
By design, this tab works particularly well on the iPhone.
Over time, we may add more information to this tab.
NB: There is a known bug that the Summary tab will be totally blank (i.e. no data) if you have included the character “(” in your Strava name. If this affects you and you’re interested in seeing your Summary data before I otherwise get round to fixing it, please let me know!