Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"head acceleration"”.
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Head Acceleration Experienced by Man: Exposure, Tolerance, and Applications
… dissertation investigates human tolerance to head acceleration using methods that pair biomechanical data collected from human volunteers with clinical data. Head impact exposure and injury risk are quantified and presented. In contrast to the publicly available data on the safety of …
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Head acceleration across youth, high school, and collegiate soccer players
… Soccer is unique in that you can use your head to advance the ball and purposeful heading is an integral part of the game. However, some have suggested that repeated heading of the soccer ball is associated with neurological deficits, though others have claimed that deficits are related to …
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Measurement of head acceleration and angular rate experienced by aerobatic pilots
… control. The actual G forces experienced at head-level in aerobatic pilots have never been characterized, and this study intends to solve this knowledge gap. Methods: Five volunteers at the 2009 US National Aerobatic Championships were fitted with tri-axial accelerometer and angular rate …
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Head Acceleration Measurements in Helmet-Helmet Impacts and the Youth Population
The research presented herein is an analysis of acceleration measurements of the head during helmet-helmet impacts, where a player's helmet impacts another player's helmet, and with a youth population in football. This research is aimed at advancing current understanding of impact biomechanics for …
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Biomechanical Analyses of Head Acceleration during Contact Sports and Ankle Joint Complex Injury
… the influence of different parameters on head acceleration. Peak head accelerations of 20g to 60g, and rise times were targeted based on measures reported in the literature. A computational model of the impactor system was developed in Adams to determine design parameters such as neck …
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Measurement of accelerations experienced by rough stock riders: A model for examining acceleration-induced head injuries in astronauts
Head injuries result in significant morbidity in rough stock rodeo events. Concussions are the most common injury sustained by rough stock riders, representing 50% of all major injuries. A pilot study conducted in 2007 examined head acceleration experienced by two rough stock riders. Ear-mounted …
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The age-related differences in temporal characteristics of head control in response to postural perturbations
… with advanced age may be related to compromised head control that may elevate the risk of fall-related TBIs. However, a better understanding of age-related differences in head control is necessary to develop targeted TBI screening measures in older adults. Therefore, this study quantified the …
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Identifying High Risk Individuals in Youth Football and Evaluating Tackling Technique
… organizations with few or no rules for limiting head impact exposure in practices or competition. Studies have found potential long-term effects of repetitive head impact exposure from a young age, even in the absence of concussion. The best methods for reducing head impact exposure include a …
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Biomechanics of Head Impacts in Soccer
… rate of concussions in this population. Wearable head impact sensors were evaluated on their ability to accurately count and measure head impacts during a collegiate women's soccer season. Head impact exposure was quantified using video analysis of this season as well. Sensors were unable to …
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Impact Biomechanics of the Head and Neck in Football
… in the thesis explores the biomechanics of the head and neck during impacts in football. The research related to the head is geared towards advancing the current understanding of the mechanisms of mild traumatic brain injury, specifically by investigating head accelerations experienced by …
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SEX DIFFERENCES IN HEAD IMPACT BIOMECHANICS AND QUANTITATIVE FUNCTIONAL DEFICITS DUE TO REPETITIVE LOADING IN HIGH SCHOOL SPORTS
… are understudied with only 20% of concussion and head kinematic sensor studies including female athletes. There is growing concern for the neurological outcomes associated with repetitive head loading in contact sports. In this dissertation, the effects of repeated head loading were investigated …
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Shock attenuation during heel-strike, forefoot-strike, and spring-boot running
… the body and is attenuated before reaching the head. This study investigated mechanisms of shock attenuation (SA) during heel-strike (HS), forefoot strike (FFS), and spring-boot (SB) running; Participants (n = 10) ran at 3.83 m·s-1 while head and leg impact acceleration, SA, and ankle and …
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Optimal Head Impact Signal Processing and the Description and Perception of Head Impact Exposure in Female Adolescent Ice Hockey Players
Concussion and repetitive head impact exposure are significant media, clinical, and research topics. Long-term symptomatic outcomes of sub-injurious head impact exposure have become a topic of concern for professional and youth contact sport athletes alike. Vulnerable populations such as females …
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An Analysis of Catcher's Mask Performance to Attenuate Head Accelerations
… the ability of catcher's masks to attenuate head accelerations upon impact with a baseball, and to compare these head accelerations to established injury thresholds for concussions. Testing involved using a pneumatic cannon to shoot baseballs at an instrumented (3-2-2-2 accelerometer array) …
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A 2-D Analysis of Strains at the Interface Between the Brain and the Skull
… deformation of brain tissue caused by skull acceleration is one of the most significant causes of traumatic brain injury (TBI). Although the deformation mechanisms within the brain have been revealed by analysis of tagged magnetic resonance images, the mechanical responses at the periphery of …
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Quantifying the Effect of Helmet Fit on Performance
… of this study were to quantify helmet fit on a headform and to determine the effect fit has on helmet performance. An impact pendulum was used to strike a helmeted NOCSAE headform mounted on a Hybrid III neck. Helmets were impacted at 4 locations at 3 energies representing a range of concussive …
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Modeling viscoelastic responses of the head/neck system during pilot ejection
The effect of added head mass during pilot ejection from an aircraft is currently being studied at the Wright Patterson Air Force Base in Ohio. The Articulated Total Body model, a FORTRAN computer program capable of simulating three-dimensional human body motion using rigid body dynamics, has been …
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Systems modelling and ethical decision algorithms for autonomous vehicle collisions
… or another AV, i.e. peak deformation and peak acceleration. The peak acceleration of the AV is then related to the accelerations experienced by the occupant(s) on-board the AV, e.g. peak head acceleration. Such information allows the M2D approach to decide on the collision target depending on …
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Laboratory and Field Studies in Sports-Related Brain Injury
… 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 …
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Head Impacts in Hockey and Youth Football: Biomechanical Response and Helmet Padding Characteristics
… in two distinct subcategories of sport related head injury research. The body of work is aimed at increasing the understanding of head impact biomechanics across a broad spectrum of impact scenarios as well as the ability of helmets to affect head impact biomechanics over time. The first study …
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