TY - JOUR
T1 - Bandwidth and sample rate requirements for wearable head impact sensors
AU - Wu, Lyndia C.
AU - Laksari, Kaveh
AU - Kuo, Calvin
AU - Luck, Jason F.
AU - Kleiven, Svein
AU - ‘Dale’ Bass, Cameron R.
AU - Camarillo, David B.
N1 - Funding Information:
We would like to thank Dr. Jason Mihalik׳s team at University of North Carolina at Chapel Hill for their involvement in the collaborative effort to collect cadaver drop test data. This work was mainly supported by the National Institutes of Health (NIH) National Institute of Biomedical Imaging and Bioengineering (NIBIB) 3R21EB01761101S1 , the Stanford Child Health Research Institute Transdisciplinary Initiatives Programs , the Stanford Bio-X Graduate Research Fellowship Program , and the Natural Sciences and Engineering Research Council of Canada Postgraduate Scholarship . We appreciate additional funding from the University of Pennsylvania Prime , US Army Research Office W911NF-10-1-0526 and the Duke University Pratt School of Engineering .
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/9/6
Y1 - 2016/9/6
N2 - Wearable inertial sensors measure human head impact kinematics important to the on-going development and validation of head injury criteria. However, sensor specifications have not been scientifically justified in the context of the anticipated field impact dynamics. The objective of our study is to determine the minimum bandwidth and sample rate required to capture the impact frequency response relevant to injury. We used high-bandwidth head impact data as ground-truth measurements, and investigated the attenuation of various injury criteria at lower bandwidths. Given a 10% attenuation threshold, we determined the minimum bandwidths required to study injury criteria based on skull kinematics and brain deformation in three different model systems: helmeted cadaver (no neck), unhelmeted cadaver (no neck), and helmeted dummy impacts (with neck). We found that higher bandwidths are required for unhelmeted impacts in general and for studying strain rate injury criteria. Minimum gyroscope bandwidths of 300 Hz in helmeted sports and 500 Hz in unhelmeted sports are necessary to study strain rate based injury criteria. A minimum accelerometer bandwidth of 500 Hz in unhelmeted sports is necessary to study most injury criteria. Current devices typically sample at 1000 Hz, with gyroscope bandwidths below 200 Hz, which are not always sufficient according to these requirements. With hard contact test conditions, the identified requirements may be higher than most soft contacts on the field, but should be satisfied to capture the worst contact, and often higher risk, scenarios relative to the specific sport or activity. Our findings will help establish standard guidelines for sensor choice and design in traumatic brain injury research.
AB - Wearable inertial sensors measure human head impact kinematics important to the on-going development and validation of head injury criteria. However, sensor specifications have not been scientifically justified in the context of the anticipated field impact dynamics. The objective of our study is to determine the minimum bandwidth and sample rate required to capture the impact frequency response relevant to injury. We used high-bandwidth head impact data as ground-truth measurements, and investigated the attenuation of various injury criteria at lower bandwidths. Given a 10% attenuation threshold, we determined the minimum bandwidths required to study injury criteria based on skull kinematics and brain deformation in three different model systems: helmeted cadaver (no neck), unhelmeted cadaver (no neck), and helmeted dummy impacts (with neck). We found that higher bandwidths are required for unhelmeted impacts in general and for studying strain rate injury criteria. Minimum gyroscope bandwidths of 300 Hz in helmeted sports and 500 Hz in unhelmeted sports are necessary to study strain rate based injury criteria. A minimum accelerometer bandwidth of 500 Hz in unhelmeted sports is necessary to study most injury criteria. Current devices typically sample at 1000 Hz, with gyroscope bandwidths below 200 Hz, which are not always sufficient according to these requirements. With hard contact test conditions, the identified requirements may be higher than most soft contacts on the field, but should be satisfied to capture the worst contact, and often higher risk, scenarios relative to the specific sport or activity. Our findings will help establish standard guidelines for sensor choice and design in traumatic brain injury research.
KW - Bandwidth
KW - Head impact biomechanics
KW - Head injury criteria
KW - Sample rate
KW - Traumatic brain injury
KW - Wearable sensors
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U2 - 10.1016/j.jbiomech.2016.07.004
DO - 10.1016/j.jbiomech.2016.07.004
M3 - Article
C2 - 27497499
AN - SCOPUS:84995578530
VL - 49
SP - 2918
EP - 2924
JO - Journal of Biomechanics
JF - Journal of Biomechanics
SN - 0021-9290
IS - 13
ER -