Uncategorized

Athlete Biological Passport For Level Change Detection

One of the weaknesses of the current Athlete Biological Passport software seems to be an over-emphasis on outlier detection versus level change detection. To illustrate this point consider the Lance Armstrong case:   According to the UCI, Armstrongs blood data never triggered a flag on the software. The software screen was non-positive despite the obvious …

Power Estimate Modelling

Comparing Performances Across Grand Tours

One of the fun parts about modelling climbing performances in Grand Tours is the ability to make historical and virtual head to head comparisons. In the figure above the grey dots are the average performance of the top 3 finishers from each Grand Tour for each finishing climb from 2008 – 2013. Overlayed on this …

Power Duration Modelling

Rethinking Intermittent Modelling

Previous attempts have have focused on either trying to normalize power to Critical Power/Functional Threshold Power: nP = %CP^4 or vessel approaches of trying to dynamically track W’/FRC balance W’b = W’ – (P-CP)*t + (CP-P)*t*(f[reconstitution]). The normalized power approach will typically work reasonably well for power outputs close to CP/FTP. Outside a fairly narrow …

Power Duration Modelling

Veloclinic Plot (W’ plot)

This post introduces a new way of plotting performance to better visualize W’ and Critical Power (CP). I haven’t seen anyone plot performance this way, so I’m going to take the liberty to name it the Veloclinic plot. In descriptive terms, it would be accurate to call it a W’ plot or a Critical Power …

Bike Fit

veloclinic Bike Fit Procedure

Velo Clinic Bike Fit Bike fit Bike fit is the process of optimizing the three dimensional configuration of the cleats, seat, and handlebars for the individual cyclist. Permissive Bike Fit The key to the veloclinic bike fit is a concept called permissive bike fit. Permissive fit means that the goal is to configure the equipment to …

Nutrition

Evidence Based Sports Nutrition

In the search for a competitive edge athletes often look to the practices of top athletes, or the latest theory from a popular guru. By chance, this approach will sometimes lead to a true performance improvement. But usually, the fad ultimately proves to make no difference or even hurts performance. An alternate approach is to …

Bike Fit

What is the Evidence Behind Bike Fit ?

Cycling related pain and overuse injury is historically very common among cyclists. From a 1 year recall period cyclists reported complaints related to the neck (48.8 %), knees (41.7 %), groin/buttocks (36.1 %), hands (31.1 %), and back (30.3 %) (Wilber et al, 1995). Similarly high rates of complaints were found during bicycle tours related …