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dc.contributor.authorBeyer, Jeffrey Andrewen
dc.date.accessioned2014-03-14T21:36:07Zen
dc.date.available2014-03-14T21:36:07Zen
dc.date.issued2011-04-27en
dc.identifier.otheretd-05112011-192146en
dc.identifier.urihttp://hdl.handle.net/10919/42635en
dc.description.abstractThe information presented herein attempts to quantify the conditions surrounding concussive impacts from foul tips to the masks of catchers and umpires in baseball. Media reports of such occasions were researched on video and pitch speed data from the Pitch F/X system recorded to suggest speeds and locations at which impacts occur. To evaluate mask performance, a pneumatic-wheel, electric-motor driven pitching machine was utilized to shoot baseballs at the instrumented head of a Hybrid III dummy. Head accelerations were calculated from a 3-2-2-2 accelerometer array to allow for comparisons of linear and angular kinematics. 6 common masks (2-piece traditional-style and 1-piece hockey-style) were tested at 7 locations at 60 mph to determine the severity of each location. The center-eyebrow and chin locations were further tested at 84 mph. Speed and location data were used to evaluate a large sample of 25 masks to explore possible performance differences between manufacturer models, mask types and cage styles. The results of this study showed no significant difference between hockey-style and traditional-style mask performance. Titanium caged masks, although lighter than their steel counterparts, experienced higher linear accelerations. However, all masks experienced linear and angular accelerations well below commonly accepted injury thresholds. Yet, concussive injury has still occurred in the players and umpires that wear these masks. The work presented here can be used to help better understand these thresholds and influence the design, construction and evaluation of a new generation of masks that decrease the risk of concussions to the wearer.en
dc.publisherVirginia Techen
dc.relation.haspartBeyer_JA_T_2011.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcatcher masken
dc.subjectumpire masken
dc.subjectbaseball impacten
dc.subjecthead accelerationsen
dc.subjectconcussionen
dc.titleThe Etiology of Impact Related Concussion for Catchers and Umpires in Baseballen
dc.typeThesisen
dc.contributor.departmentBiomedical Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineBiomedical Engineeringen
dc.contributor.committeechairDuma, Stefan M.en
dc.contributor.committeememberMadigan, Michael L.en
dc.contributor.committeememberKemper, Andrew R.en
dc.contributor.committeememberGoforth, Michael W.en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05112011-192146/en
dc.date.sdate2011-05-11en
dc.date.rdate2011-06-01en
dc.date.adate2011-06-01en


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