View Full Version : Re: (Bluetooth) IMU Sensor Studies

Brodie, Matthew
03-31-2009, 06:52 AM
Because the investigation of this new technology may be of interest to everyone I have posted my response to Kyle's question about IMUs and motion capture to the list.

It is quite possible to get accurate biomechanical data using such a system including accelerations and rotations and then you can derive net joint torques and forces. Theoretically IMUs should be more accurate than video systems for this because the internal sensing components measure rotation and acceleration directly, however there are still a few pit falls to the new technology as there is with any new technology. I have attached a list of my papers on the subject below; information includes the problems I came across and how the problems were overcome, and soon my PhD thesis will also be in the public domain.

For a more graphic demonstration see my youtube videos at: www.youtube.com/BrodieMAD For a short summary of how Fusion Motion Capture works see the video titled: 'Science of Gold Medals and Skiing', this work contributed to me being named Overall Runner Up, 2008 MacDiarmid Young Scientist of the year.

Matthew Brodie

Publication list follows:

Brodie, M., Walmsley, A., Page, W., 2008 Fusion Motion Capture: Can Technology be used to Optimise Ski Racing Technique? The Impact of Technology on Sport 2, Page 825-831, 2008 Tailor & Francis Group, London, ISBN-13: 978-0-415-45695-1

Brodie, M., Walmsley, A., Page, W., 2008 Fusion Motion Capture: A Prototype System Using IMUs and GPS for the Biomechanical Analysis of Alpine Ski Racing, Journal of Sports Technology, 1, 17-28

Brodie, M., Walmsley, A., Page W., 2008 3D Dynamic Accuracy of Inertial Measurement Units During Simple Pendulum Motion. Computer Methods in Biomechanics and Biomedical Engineering, 11(03), pp. 235 - 242.

Brodie, M., Walmsley, A., Page W., 2008 Static Accuracy and Calibration of Inertial Measurement Units (IMUs) for 3D Orientation. Computer Methods in Biomechanics and Biomedical Engineering, 11(06), pp. 641 - 648.

Brodie, M., Walmsley, A., Page W., 2008 A comparison of motion measurement using fusion motion capture and video motion analysis. Computer Methods in Biomechanics and Biomedical Engineering, Under Review

Brodie, M., Walmsley, A., & Page, W., 2008 How to ski faster: art or science? In E. Müller (Ed.), Science and Skiing 4 (pp. 162-174). Oxford: Meyer and Meyer Sport.

-----Original Message-----
From: * Biomechanics and Movement Science listserver [mailto:BIOMCH-L@NIC.SURFNET.NL] On Behalf Of Kyle Vernest
Sent: Wednesday, 1 April 2009 2:31 a.m.
Subject: [BIOMCH-L] (Bluetooth) IMU Sensor Studies

I have been asked to assist a physician at my institution with some
data collection. We are planning on using a Memsense Bluetooth IMU
sensor (http://www.memsense.com/images/downloads/81/Datasheet-(Rev.-D---Eff-Jan.-1,-2009).pdf)
to collect biomechanical forces on the body during exercise.

We are just wondering if:
1. Anyone else has used this device for Biomechanical Data collection.
2. Anyone has used a similar device for Biomechanical Data collection.
3. Any clinical studies have been done with this device in humans
4. Any other relevant experiences pertaining to the accuracy of the device

We have found some studies looking at downhill skiing and running, but
we were hoping we could use it to collect accelerations and rotations
during exercise, rather then things such as stride length and
location. Any input is appreciated and a summary of replies will be

Kyle Vernest
MHSc Clinical Biomedical Engineering Candidate
Institute of Biomaterials and Biomedical Engineering
University of Toronto, Canada

Graduate Research Student
Osteoporosis Research Program
University Health Network, Toronto

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