Performance of orientation sensors for use with a functional electrical stimulation mobility system.
The purpose of this study was to verify the performance of recently developed body-worn sensor packs against 3D motion analysis of trunk and lower-limb movements. Five sensor packs, each consisting of rate gyroscope and two 2-D accelerometers controlled by a microprocessor were attached to the trunk, thighs, and shanks of an able bodied subject. A 6-camera motion analysis system (MAS) recorded multiple trials of sit-to-stand movements and normal walking. Time domain signals from each sensor pack were significantly correlated (r = 0.90-0.99;p < 0.05) with a root mean square errors of less than 5 degrees when compared against the same limb angle measurements calculated by the MAS. These data demonstrate that these external sensor packs are accurate devices for measuring trunk and lower-limb sagittal plane orientation in real-time.
Simcox
Scott
S
Rehabilitation Research Centre, The University of Sydney, Australia. ssimcox@fhs.usyd.edu.au
Parker
Simon
S
Davis
Glen M
GM
Smith
Richard W
RW
Middleton
James W
JW
D000054:Acceleration; D004599:Electric Stimulation Therapy / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007866:Leg / Q000502:physiology*; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D009068:Movement / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D013909:Thorax / Q000502:physiology*; D014159:Transducers