Behind the Scenes: Checking Foot Angular Range Accuracy

Hi, I’m Naoto from the R&D Department at LEOMO. Today I’ll be introducing how we checked the accuracy of the TYPE-R’s Foot Angular Range algorithm.

Although the accuracy for all our algorithms has been meticulously validated using the OptiTrack motion capture system, we had one athlete that sometimes had a whopping 20-degree average difference between his left and right Foot Angular Range. We couldn’t believe it, so we had to double check the TYPE-R’s numbers, just in case.

We had the athlete come to LEOMO for testing and had him ride on an indoor trainer at roughly 80 to 100 rpm.

LEOMO TYPE-R FAR Accuracy

If you look at lap 5, you can see that his left and right Foot AR has the largest discrepancy during the test. Here’s a close-up of lap 5:

LEOMO TYPE-R Accuracy 2

LEOMO TYPE-R Accuracy 3

We compared the measurements recorded on the TYPE-R to the measurements we took from the video:

Left foot: 
- TYPE-R: 62.9 deg
- Video: 62.877 deg
- 62.877/62.9*100=0.99 = 99.9% accuracy

Right foot:
- TYPE-R: 50.8 deg
- Video: 48.577 deg
- 48.577/50.8*100=0.956 = 95.6% accuracy

Conclusion

The athlete did indeed have a very large gap between his left and right Foot Angular Range. We were also able to confirm the high accuracy of the Foot Angular Range algorithm — which can be off by no more than 5%(max).


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