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 …

## 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 …

## 2014 Giro d’Italia Climb Preview

The upcoming 2014 Giro d’Italia features 6 that are likely to play a role in shaping the final podium. As with previous Grand Tours, @ammattipyoraily is my go to source for the most consistent data. The process is simple: 1. Measure the climbs. 2. Time the finishing climbs. 3. Estimate normalized W/kg power outputs using …

## Video explainers of the veloclinic Mean Maximal Power Duration Models

DerivationPart 1 The Equations Part 2 Example Fits Also see the Derivation. Below are the equations since they are a little hard to see in the video. #2 secret exp top linear bottom fo <- y~ w1/x*(1-exp(-x/tau1))*((1-exp(-x/10))^alpha) + pow2/(1+x/tau2) rpowb <- nls2(fo, start=list(w1 = rw1, tau1 = rtau1b, pow2 = rpow2, tau2 = rtau2, alpha …

## Derivation of the Candidate Mean Maximal Power Duration Models

Description of the derivation of the veloclinic Mean Maximal Power Duration Models. Click here for the pdf: Power Model Derivation Also see the Video Explainers

## 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 …

## 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 …

## 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 …

## Intro to Power Estimate Modelling

It’s just physics, but it’s so much more. The original description of a complete mathematical model for estimating cycling power output has to go to Martin. But it was Antoine Vayer’s snarling bulldog sound bites and his collaboration with Fred Portoleau on Not Normal Doping that brought the power estimates and the debate over what the numbers …