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dc.contributor.authorCobb, Bryan Richarden_US
dc.date.accessioned2016-10-13T06:00:14Z
dc.date.available2016-10-13T06:00:14Z
dc.date.issued2015-04-21en_US
dc.identifier.othervt_gsexam:5130en_US
dc.identifier.urihttp://hdl.handle.net/10919/73208
dc.description.abstractThe studies presented in this dissertation investigated biomechanical factors associated with sports-related brain injuries on the field and in the laboratory. In the first study, head impact exposure in youth football was observed using a helmet mounted accelerometer system to measure head kinematics. The results suggest that restriction on contact in practice at the youth level can translate into reduced head impact exposure over the course of a season. A second study investigated the effect of measurement error in the head impact kinematic data collected by the helmet mounted system have on subsequent analyses. The objective of this study was to characterize the propagation of random measurement error through data analyses by quantifying descriptive statistic uncertainties and biases for biomechanical datasets with random measurement error. For distribution analyses, uncertainties tend to decrease as sample sizes grow such that for a typical player, the uncertainties would be around 5% for peak linear acceleration and 10% for peak angular (rotational) acceleration. The third and fourth studies looked at comparisons between two headforms commonly used in athletic helmet testing, the Hybrid III and NOCSAE headforms. One study compared the headform shape, particularly looking at regions that are likely to affect helmet fit. Major differences were found at the nape of the neck and in the check/jaw regions that may contribute to difficulty with fitting a helmet to the Hybrid III headform. For the final study, the impact responses of the two headforms were compared. Both headforms were mounted on a Hybrid III neck and impacted at various magnitudes and locations that are representative of impacts observed on the football field. Some condition-specific differences in kinematic parameters were found between the two headforms though they tended to be small. Both headforms showed reasonable repeatability.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectBiomechanicsen_US
dc.subjectConcussionen_US
dc.subjectFootballen_US
dc.subjectHelmet testingen_US
dc.subjectand Head accelerationen_US
dc.titleLaboratory and Field Studies in Sports-Related Brain Injuryen_US
dc.typeDissertationen_US
dc.contributor.departmentBiomedical Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineBiomedical Engineeringen_US
dc.contributor.committeechairRowson, Stevenen_US
dc.contributor.committeechairDuma, Stefan M.en_US
dc.contributor.committeememberStitzel, Joel D.en_US
dc.contributor.committeememberGayzik, Francis S.en_US
dc.contributor.committeememberBrolinson, Per Gunnaren_US


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