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Ann Biomed Eng. 2017 Sep;45(9):2122-2134. doi: 10.1007/s10439-017-1852-2. Epub 2017 May 16.

Estimation of 3D Ground Reaction Force Using Nanocomposite Piezo-Responsive Foam Sensors During Walking.

Author information

1
Department of Mechanical Engineering, Brigham Young University, 435B CTB, Provo, UT, 84602, USA.
2
Department of Statistics, Brigham Young University, Provo, UT, 84602, USA.
3
Department of Exercise Science, Brigham Young University, Provo, UT, 84602, USA.
4
Department of Mechanical Engineering, Brigham Young University, 435B CTB, Provo, UT, 84602, USA. abowden@byu.edu.

Abstract

This paper describes a method for the estimation of the 3D ground reaction force (GRF) during human walking using novel nanocomposite piezo-responsive foam (NCPF) sensors. Nine subjects (5 male, 4 female) walked on a force-instrumented treadmill at 1.34 m/s for 120 s each while wearing a shoe that was instrumented with four NCPF sensors. GRF data, measured via the treadmill, and sensor data, measured via the NCPF inserts, were used in a tenfold cross validation process to calibrate a separate model for each individual. The calibration model estimated average anterior-posterior, mediolateral and vertical GRF with mean average errors (MAE) of 6.52 N (2.14%), 4.79 N (6.34%), and 15.4 N (2.15%), respectively. Two additional models were created using the sensor data from all subjects and subject demographics. A tenfold cross validation process for this combined data set resulted in models that estimated average anterior-posterior, mediolateral and vertical GRF with less than 8.16 N (2.41%), 6.63 N (7.37%), and 19.4 N (2.31%) errors, respectively. Intra-subject estimates based on the model had a higher accuracy than inter-subject estimates, likely due to the relatively small subject cohort used in creating the model. The novel NCPF sensors demonstrate the ability to accurately estimate 3D GRF during human movement outside of the traditional biomechanics laboratory setting.

KEYWORDS:

Foam sensor; Functional data analysis; Gait analysis; Ground reaction force; Nanocomposite; Wearable sensor

PMID:
28512701
DOI:
10.1007/s10439-017-1852-2
[Indexed for MEDLINE]

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