The Influence of Hard Hat Design Features on Head Acceleration Attenuation.

abstract：:The purpose of this study was to determine if gender differences exist in the variability of various lower extremity (LE) segment and joint couplings during an unanticipated cutting maneuver. 3-D kinematics were collected on 24 college soccer players (12 M, 12 F) while each performed the cutting maneuver. The followin...

journal_title：Journal of applied biomechanics

authors： Pollard CD,Heiderscheit BC,van Emmerik RE,Hamill J

更新日期：2005-05-01 00:00:00

abstract：:The aim of this study was to compare the effects of grab rail position, orientation, and number of hands used on the kinetics of assisted sit-to-stand transfers. Participants were 12 able-bodied older adults between the ages of 69 and 88 years. While each one performed the sit-to-stand transfer, a motion analysis syst...

journal_title：Journal of applied biomechanics

authors： O'Meara DM,Smith RM

更新日期：2005-02-01 00:00:00

abstract：:A ski jumper tries to maintain an aerodynamic position in the in-run during changing environmental forces. The purpose of this study was to analyze the mechanical demands on a ski jumper taking the in-run in a static position. We simulated the in-run in ski jumping with a 4-segment forward dynamic model (foot, leg, th...

journal_title：Journal of applied biomechanics

authors： Ettema GJ,Bråten S,Bobbert MF

更新日期：2005-08-01 00:00:00

abstract：:Plantar fasciitis is a common foot disorder that affects more than two million Americans each year. Conservative management of plantar fasciitis is the first line of treatment by the medical specialist who frequently encounters this common foot complaint. In this study, 50 patients with plantar fasciitis of 4 weeks du...

journal_title：Journal of applied biomechanics

authors： Kavros SJ

更新日期：2005-11-01 00:00:00

abstract：:Seven top amateur or professional skateboarders (BW=713 N+/-83 N) performed Ollie maneuvers onto and off an elevated wooden platform (45.7 cm high). We recorded ground reaction force (GRF) data for three Ollie Up (OU) and Ollie Down (OD) trials per participant. The vertical GRF (VGRF) during the OU has a characteristi...

journal_title：Journal of applied biomechanics

authors： Frederick EC,Determan JJ,Whittlesey SN,Hamill J

更新日期：2006-02-01 00:00:00

abstract：:A modification to an existing mathematical model is described, which permits the determination of subject-specific inertia parameters for wobbling and rigid masses of female body segments. The model comprises segment-specific soft tissue, bone, and lung components. A total of 59 geometric solids (40 soft tissue, 17 bo...

journal_title：Journal of applied biomechanics

authors： Gittoes MJ,Kerwin DG

更新日期：2006-05-01 00:00:00

abstract：:This paper presents the first reported measurements of lumbar intervertebral disc pressure in vivo during spinal manipulation. A pressure transducer was inserted into the nucleus pulposus of one normal-appearing lumbar disc in an asymptomatic adult volunteer. Pressures were recorded during several body positions and m...

journal_title：Journal of applied biomechanics

authors： Lisi AJ,O'Neill CW,Lindsey DP,Cooperstein R,Cooperstein E,Zucherman JF

更新日期：2006-08-01 00:00:00

abstract：:Lower extremity injuries in figure skating have long been linked to skating boot stiffness, and recent increases in jump practice time may be influencing the frequency and seriousness of these injuries. It is hypothesized that stiff boots compromise skaters' abilities to attenuate jump landing forces. Decreasing boot ...

journal_title：Journal of applied biomechanics

authors： Bruening DA,Richards JG

更新日期：2006-11-01 00:00:00

abstract：:The aim of this study was to investigate the contribution of upper extremity, trunk, and lower extremity movements in overarm throwing in team handball. In total, 11 joint movements during the throw were analyzed. The analysis consists of maximal angles, angles at ball release, and maximal angular velocities of the jo...

journal_title：Journal of applied biomechanics

authors： van den Tillaar R,Ettema G

更新日期：2007-02-01 00:00:00

abstract：:Mechanical load has been estimated during step exercise based on ground reaction force (GRF) obtained by force platforms. It is not yet accurately known whether these measures reflect foot contact forces once the latter depend on footwear and are potentially modified by the compliant properties of the step bench. The ...

journal_title：Journal of applied biomechanics

authors： Santos-Rocha R,Veloso A

更新日期：2007-05-01 00:00:00

abstract：:Modern electronics allow for the unobtrusive measurement of accelerations outside the laboratory using wireless sensor nodes. The ability to accurately measure joint accelerations under unrestricted conditions, and to correlate them with jump height and landing force, could provide important data to better understand ...

journal_title：Journal of applied biomechanics

authors： Elvin NG,Elvin AA,Arnoczky SP

更新日期：2007-08-01 00:00:00

abstract：:Stooping and squatting postures are seen in a number of industries (e.g., agriculture, construction) where workers must work near ground level for extended periods of time. The focus of the current research was to evaluate a knee support device designed to reduce the biomechanical loading of these postures. Ten partic...

journal_title：Journal of applied biomechanics

authors： Shu Y,Jiang Z,Xu X,Mirka GA

更新日期：2007-11-01 00:00:00

abstract：:The purpose of this study was to determine whether the phenomenon of bilateral deficit in muscular force production observed in healthy subjects and mildly impaired stroke patients also exists in patients with more chronic and greater levels of stroke impairment. Ten patients with chronic hemiparesis resulting from st...

journal_title：Journal of applied biomechanics

authors： McQuade K,Harris-Love ML,Whitall J

更新日期：2008-02-01 00:00:00

abstract：:The goal of this study was to quantify the relative contributions of each muscle group surrounding the spine to vertebral joint rotational stiffness (VJRS) during the push-up exercise. Upper-body kinematics, three-dimensional hand forces and lumbar spine postures, and 14 channels (bilaterally from rectus abdominis, ex...

journal_title：Journal of applied biomechanics

authors： Howarth SJ,Beach TA,Callaghan JP

更新日期：2008-05-01 00:00:00

abstract：:Predicting muscle fascicle length changes during passive movements may lead to a better understanding of muscle function. The purpose of this study was to experimentally compare fascicle length changes in the gastrocnemius during two-joint passive movements with a previously derived kinematic model based on anatomical...

journal_title：Journal of applied biomechanics

authors： Brindle TJ,Miller JL,Lebiedowska MK,Stanhope SJ

更新日期：2008-08-01 00:00:00

abstract：:Pedometers are basically step counters usually used to estimate the distance walked by a pedestrian. Although their precision to compute the number of steps is quite accurate (about 1%), their feasibility to estimate the walked distance is very poor, as they do not consider the intrinsic variability of human gait. Rep...

journal_title：Journal of applied biomechanics

authors： Lopez AM,Alvarez D,Gonzalez RC,Alvarez JC

更新日期：2008-11-01 00:00:00

abstract：:The purpose of this investigation was to clarify the effects of blade design and oar length on performance in rowing. Biomechanical models and equations of motion were developed to identify the main forces that affect rowing performance. In addition, the mechanical connection between the propelling blade force and the...

journal_title：Journal of applied biomechanics

authors： Nolte V

更新日期：2009-02-01 00:00:00

abstract：:To investigate the relationship between fascicle behavior and joint torque, the fascicle behavior of the triceps surae during isometric and eccentric (30 and 60 deg/s) plantar flexion by maximal voluntary and submaximal electrical activation (MVA and SEA) was measured by realtime ultrasonography. Eccentric torque at 3...

journal_title：Journal of applied biomechanics

authors： Chino K,Mitsukawa N,Kobayashi K,Miyoshi Y,Oda T,Kanehisa H,Fukunaga T,Fukashiro S,Kawakami Y

更新日期：2009-05-01 00:00:00

abstract：:This study used a computational fluid dynamics methodology to analyze the effect of body position on the drag coefficient during submerged gliding in swimming. The k-epsilon turbulent model implemented in the commercial code Fluent and applied to the flow around a three-dimensional model of a male adult swimmer was us...

journal_title：Journal of applied biomechanics

authors： Marinho DA,Reis VM,Alves FB,Vilas-Boas JP,Machado L,Silva AJ,Rouboa AI

更新日期：2009-08-01 00:00:00

abstract：:The aim of this study was to develop a functional model of monofin swimming by assigning numerical forms to certain technique parameters. The precise determination of optimal foot displacement and monofin strain points toward a model aspect for increasing swimming speed. Eleven professional swimmers were filmed underw...

journal_title：Journal of applied biomechanics

authors： Rejman M,Ochmann B

更新日期：2009-11-01 00:00:00

abstract：:The geometric method combines a volume and a density function to estimate body segment parameters and has the best opportunity for developing the most accurate models. In the trunk, there are many different tissues that greatly differ in density (e.g., bone versus lung). Thus, the density function for the trunk must b...

journal_title：Journal of applied biomechanics

authors： Wicke J,Dumas GA

更新日期：2010-02-01 00:00:00

abstract：:Lateral ankle sprains (LAS) are among the most common joint injuries, and although most are resolved with conservative treatment, others develop chronic ankle instability (AI). Considerable attention has been directed toward understanding the underlying causes of this pathology; however, little is known concerning the...

journal_title：Journal of applied biomechanics

authors： Gutierrez GM,Kaminski T

更新日期：2010-02-01 00:00:00

abstract：:Generic muscle parameters are often used in muscle-driven simulations of human movement to estimate individual muscle forces and function. The results may not be valid since muscle properties vary from subject to subject. This study investigated the effect of using generic muscle parameters in a muscle-driven forward ...

journal_title：Journal of applied biomechanics

authors： Xiao M,Higginson J

更新日期：2010-05-01 00:00:00

abstract：:Considerable variability in tibial acceleration slope (AS) values, and different interpretations of injury risk based on these values, have been reported. Acceleration slope variability may be due in part to variations in the quantification methods used. Therefore, the purpose of this study was to quantify differences...

journal_title：Journal of applied biomechanics

authors： Duquette AM,Andrews DM

更新日期：2010-05-01 00:00:00

abstract：:The purpose of the current investigation was to test the hypothesis that subjects with patellar tendinopathy would demonstrate altered sagittal plane joint moment contributions during hopping tasks. Fourteen subjects (7 patellar tendinopathy, 7 controls) participated. Sagittal net joint moments of the lower extremity,...

journal_title：Journal of applied biomechanics

authors： Souza RB,Arya S,Pollard CD,Salem G,Kulig K

更新日期：2010-08-01 00:00:00

abstract：:Understanding how the human body responds to unexpected force perturbations during quiet sitting is important to the science of motor behavior and the design of neuroprostheses for sitting posture. In this study, the performance characteristics of the neck and trunk in healthy individuals were assessed by measuring th...

journal_title：Journal of applied biomechanics

authors： Thrasher TA,Sin VW,Masani K,Vette AH,Craven BC,Popovic MR

更新日期：2010-08-01 00:00:00

abstract：:This study examined whether gate setup and turn radii influence energy dissipation in slalom skiing. 3D kinematical measurements were performed over two runs on the same slope in a WC slalom competition with two different gate setups: 1) open gates (OG) and 2) open gates with a delayed gate (DG). Using the arithmetic ...

journal_title：Journal of applied biomechanics

authors： Supej M,Holmberg HC

更新日期：2010-11-01 00:00:00

abstract：:Computer assisted surgical interventions and research in joint kinematics rely heavily on the accurate registration of three-dimensional bone surface models reconstructed from various imaging technologies. Anomalous results were seen in a kinematic study of carpal bones using a principal axes alignment approach for th...

journal_title：Journal of applied biomechanics

authors： Beek M,Small CF,Ellis RE,Sellens RW,Pichora DR

更新日期：2010-11-01 00:00:00

abstract：:The purpose of this study was to analyze the hydrodynamic characteristics of a realistic model of an elite swimmer hand/forearm using three-dimensional computational fluid dynamics techniques. A three-dimensional domain was designed to simulate the fluid flow around a swimmer hand and forearm model in different orient...

journal_title：Journal of applied biomechanics

authors： Marinho DA,Silva AJ,Reis VM,Barbosa TM,Vilas-Boas JP,Alves FB,Machado L,Rouboa AI

更新日期：2011-02-01 00:00:00

abstract：:The purpose of the current study was to identify the relationships between competitive performance and tether forces according to distance swam, in the four strokes, and to analyze if relative values of force production are better determinants of swimming performance than absolute values. The subjects (n = 32) perform...

journal_title：Journal of applied biomechanics

authors： Morouço P,Keskinen KL,Vilas-Boas JP,Fernandes RJ

更新日期：2011-05-01 00:00:00