In Vivo Evaluation of Wearable Head Impact Sensors
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- 20 August 2015
- journal article
- research article
- Published by Springer Science and Business Media LLC in Annals of Biomedical Engineering
- Vol. 44 (4), 1234-1245
- https://doi.org/10.1007/s10439-015-1423-3
Abstract
Inertial sensors are commonly used to measure human head motion. Some sensors have been tested with dummy or cadaver experiments with mixed results, and methods to evaluate sensors in vivo are lacking. Here we present an in vivo method using high speed video to test teeth-mounted (mouthguard), soft tissue-mounted (skin patch), and headgear-mounted (skull cap) sensors during 6–13 g sagittal soccer head impacts. Sensor coupling to the skull was quantified by displacement from an ear-canal reference. Mouthguard displacements were within video measurement error (<1 mm), while the skin patch and skull cap displaced up to 4 and 13 mm from the ear-canal reference, respectively. We used the mouthguard, which had the least displacement from skull, as the reference to assess 6-degree-of-freedom skin patch and skull cap measurements. Linear and rotational acceleration magnitudes were over-predicted by both the skin patch (with 120% NRMS error for \(a_{\rm mag}\), 290% for \(\alpha _{\rm mag}\)) and the skull cap (320% NRMS error for \(a_{\rm mag}\), 500% for \(\alpha _{\rm mag}\)). Such over-predictions were largely due to out-of-plane motion. To model sensor error, we found that in-plane skin patch linear acceleration in the anterior–posterior direction could be modeled by an underdamped viscoelastic system. In summary, the mouthguard showed tighter skull coupling than the other sensor mounting approaches. Furthermore, the in vivo methods presented are valuable for investigating skull acceleration sensor technologies.
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Funding Information
- National Institutes of Health (3R21EB01761101S1)
- David and Lucile Packard Foundation (38454)
- Stanford Child Health Research Institute (Transdisciplinary Initiatives Program)
This publication has 21 references indexed in Scilit:
- Six Degree-of-Freedom Measurements of Human Mild Traumatic Brain InjuryAnnals of Biomedical Engineering, 2014
- A Head Impact Detection System Using SVM Classification and Proximity Sensing in an Instrumented MouthguardIEEE Transactions on Biomedical Engineering, 2014
- On the accuracy of the Head Impact Telemetry (HIT) System used in football helmetsJournal of Biomechanics, 2013
- An Instrumented Mouthguard for Measuring Linear and Angular Head Impact Kinematics in American FootballAnnals of Biomedical Engineering, 2013
- Measuring Head Kinematics in Football: Correlation Between the Head Impact Telemetry System and Hybrid III HeadformAnnals of Biomedical Engineering, 2011
- Development of the STAR Evaluation System for Football Helmets: Integrating Player Head Impact Exposure and Risk of ConcussionAnnals of Biomedical Engineering, 2011
- Heading in football. Part 1: Development of biomechanical methods to investigate head responseBritish Journal of Sports Medicine, 2005
- Effect of skin movement on the analysis of skeletal knee joint motion during runningJournal of Biomechanics, 1997
- Measurement of the Impulsive Bone Motion by Skin-Mounted AccelerometersJournal of Biomechanical Engineering, 1993
- A Mathematical Method for the Measurement of Bone Motion With Skin-Mounted AccelerometersJournal of Biomechanical Engineering, 1990