期刊
JOURNAL OF BIOMECHANICS
卷 49, 期 13, 页码 2918-2924出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2016.07.004
关键词
Traumatic brain injury; Head impact biomechanics; Wearable sensors; Bandwidth; Sample rate; Head injury criteria
资金
- National Institutes of Health (NIH) National Institute of Biomedical Imaging and Bioengineering (NIBIB) [3R21EB01761101S1]
- Stanford Child Health Research Institute Transdisciplinary Initiatives Programs
- Stanford Bio-X Graduate Research Fellowship Program
- Natural Sciences and Engineering Research Council of Canada Postgraduate Scholarship
- University of Pennsylvania Prime
- US Army Research Office [W911NF-10-1-0526]
- Duke University Pratt School of Engineering
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. (C) 2016 Elsevier Ltd. All rights reserved.
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