As a fitter, it's useful to know what your rider's knee is doing during the pedal stroke. For example, is the knee moving directly up & down, or is it flaring out (away from the frame) at the top of the stroke, possibly indicating hip impingement? Is the "up" stroke different from the "down" stroke, possibly indicating pelvic twisting?
Some bike fit systems attempt to visualise this with a frontal camera and lasers; and you can certainly use a frontal webcam and laser with Velogic Studio.
However, Velogic Studio has an even better way to visualize and quantify knee movement, made possible because our lateral camera can see depth. This means that Velogic Studio can see the knee moving away from the camera & towards the frame (and vice-versa) during the stroke.
Knee track visualization
The knee track is collected automatically when you capture a position
. The components of the knee track visualization are:
- An illustration of of a rider. This will appear on either the right-hand side or left-hand side of the image, depending on whether the capture was of the right side of the rider or the left.
- Green and blue lines representing the path of the knee as it travels down and up the pedal stroke.
This single image captures the path of the knee all the way through the pedal stroke. It may help to imagine a small light mounted on the side of the rider's knee, and a long-exposure camera. You can imagine the light being green when the rider's knee is moving down, and blue when the rider's knee is moving back up. If you could capture the path of that light, averaged over many pedal strokes, you will have a good mental image of what the knee track image is showing.
Interpreting the knee track visualization
Velogic Studio provides you with a lot of data so that you can make judgements across a range of factors. You shouldn't try to diagnose issues solely from the knee track; however, there are some characteristic "patterns" that might help indicate particular problems.
Angled knee track
This may indicate that the seat is too low, forcing the knee to move outwards when it is flexed.
Separated knee track
If the down stroke and up stroke are very separated, with the down stroke is much closer to the frame, this may indicate that the rider is twisting their pelvis e.g. to accommodate the seat being too high.
Mostly vertical & close together
A knee track where the lines are mostly close together and close to vertical generally indicates good stability on the bike.
Advantages of Velogic Studio's knee track vs webcam + laser:
- The information is available as a single image, rather than a video - so it can be included in the report.
- The information is averaged over many pedal strokes, so one odd pedal stroke doesn't give unrepresentative data
- The direction of travel is clearly indicated, by color & arrowheads
- No additional hardware or fitter interaction required; knee track is collected as a byproduct of a normal capture
- You can more easily compare changes in knee track, using overlay and morph comparisons (see Review window: Images)
Report options and pages
Velogic Studio has a professionally-designed, full-featured, automatically-generated report. Our users frequently give feedback that this is the "best feature" of Velogic Studio, so let's explore! The report is generated on Step 3 of the fit process. ...
Calibration is a process which accurately defines the location and orientation of the fit bike relative to the camera, so that measurements taken during the fit are as accurate as possible. The 5 points that are captured allow us to correct for ...
Release notes - Velogic Studio
This section summarises bugs and features released to Velogic Studio users. See also: Release notes for Insider version Note that new releases of Velogic Studio are automatically delivered to your computer. You can check the version number on the ...
Release Notes - Velogic Studio (Insider)
These are the release notes for the Insider version of Velogic Studio. See also: Release notes for the main (non-insider) version To help us prioritize future work, please participate in our feedback hub. v3.0.2155 on 2022-11-23 [Feature] Add ...
Reviewing fit artifacts
As you carry out the fit, Velogic Studio records various "artifacts" for each capture. These include: Videos from the Kinect camera and/or any webcams you have at different positions around the rider. Images from those same cameras, and also from any ...