A1 Journal article (refereed), original research

Embedded Inertial Measurement Unit Reveals Pole Lean Angle for Cross Country Skiing

Open Access hybrid publication

Publication Details
Authors: Bruzzo John, Perkins Noel C., Mikkola Aki
Publisher: Springer Verlag (Germany)
Publication year: 2020
Language: English
Related Journal or Series Information: Sports Engineering
Volume number: 23
Issue number: 1
ISSN: 1369-7072
JUFO-Level of this publication: 1
Open Access: Open Access hybrid publication


This study introduces an inertial
measurement unit-based measurement system for resolving the dynamic lean angle
of a ski pole during double poling while cross-country skiing. The measurement
system estimates both the pole lean angle and pole–terrain contact events.
Reported are results from 20 trials providing validated estimates of ski pole
lean angle and the timing of pole plant and pole lift events. The pole lean
angle is estimated from a complementary filter that fuses estimates of
orientation from the embedded accelerometer and angular rate gyro. Validation
follows from comparison with video capture measurements. Bland–Altman analysis
showed agreement between the two measurement modalities with less than 5% bias
in the mean differences (relative to the lean angle range of motion). Companion
correlation analysis confirms strong correlation (r=0.99) between the inertial measurement unit and video-estimated
lean angles and with mean root-mean-square errors below 4.5∘.

Last updated on 2020-04-03 at 11:46