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In response to musculoskeletal injury risk consequences of shifting global body composition demographics, this study explored relationships between body composition and strength. Negative correlations between strength normalized by body weight and body composition suggest current assumptions may pro...
Individuals with lower limb malalignments may utilize differing movement strategies that are protective of their knees. To test this idea, total support moment distributions were compared between healthy individuals with and without genu valgum malalignment during single-limb forward and lateral dro...
Rotator cuff disease is a common cause of pain and dysfunction. Understanding the mechanism of rotator cuff injury is required for prevention and effective treatment. The effect of kinematics on rotator cuff pathology is not well understood — finite element modeling may be used to understand the m...
Biomechanical studies typically model the ankle as a rigid foot segment, and thus the contribution of structures within the foot to overall leg stiffness has been largely neglected. We designed a study to investigate the contributions of the ankle, midfoot and forefoot to lower limb stiffness. We hy...
Range of motion (ROM) impairments occur in up to 77% of breast cancer survivors (BCS) [1]. This study defined the influence of time from treatment on ROM, specifically during activities of daily living (ADLs). Kinematic data of the torso and upper limbs were collected during maximal ROM and ADL (for...
Understanding normal ulnar geometry is important for surgeons planning corrective ulnar osteotomies. We developed a statistical shape model of the ulna to investigate sex differences in its three-dimensional geometry. The model was based on the right and left ulnae of 20 males and 20 females, isotro...
Head stabilization has been considered an important variable for motor control strategies, however, is not habitual include it in clinical gait analysis. The research goal of this study was to analyze the stability of the position of the head during the heel strike and toe-off events of the gait cyc...
Self-report measures and objective motion capture are some of the methods to evaluate upper extremity (UE) function. The Kinect camera offers portable and low-cost motion capture capabilities. The purpose of this study was to determine the association between actual UE functional movement obtained b...
Falls among the elderly (aged ≥ 65) occur frequently and result in high injury and mortality rates. Studying how older adults regulate stepping to maintain lateral balance is critical to understanding and reducing falling events in this population. Here, we compared how healthy young and older adu...
Repetitive overhead work remains a potent risk factor for development of musculoskeletal shoulder disorders. This study evaluated how subjective and objective measures of shoulder performance, and indicators of muscle fatigue, varied as a function of exertion height during a complex hand force exert...
Individuals with lower limb amputation often develop overuse injuries and osteoarthritis in the intact knee. Unfortunately, how prosthetic foot stiffness and load carriage technique influences intact knee joint loading during amputee gait is not well understood. This study found that during unloaded...
Current literature provides evidence that moving adjacent body segments can alter muscle activity, but there is a gap on the effects at the glenohumeral joint. The purpose of this study is to investigate differences in glenohumeral muscle activation elicited by altering torso angle during shoulder f...
Movement planning and execution are heavily influenced by visual and proprioceptive sensory information. The present study tests the effect of visual manipulations in a 3D virtual reality environment on movement outcomes in a joint position sense task. It was observed that removing visual informatio...
The current study aimed to develop a statistical shape model (SSM) for reconstruction of subject-specific three-dimensional (3D) knee model with multiple fluoroscopic images, and to evaluate via computer simulation its theoretical accuracy and determine the minimum number of images needed for an acc...
We introduce effective mass as the preferred alternative to total system mass when analyzing a multi-link model of the human body. Effective mass (EM) is defined as the mass that would have equivalent motion characteristics at the point of force application if substituted for the whole system. We de...
We performed ultrashort echo time magnetic resonance imaging (UTE-MRI) on 13 young and 10 older (>60 yrs) adults. Bicomponent exponential fits were used to characterize the bound (short decay time, T2*s) and free (long decay time, T2*l) water in the Achilles tendon. Older adults exhibited significan...
The injury biomechanics of wheelchair lacrosse remains unknown. Thus, this study sought to characterize upper extremity kinematic differences in the overhead throw between able-bodied and wheelchair lacrosse players. Results suggest significant differences occur in glenohumeral joint flexion and ext...
Using our lab’s biplane fluoroscopy system, we collected data on eight bone phantoms to assess the accuracy of our custom bead-based and model-based tracking algorithms. Custom rigs were constructed to apply uniaxial rotation and translation to these bone phantoms. External potentiometer measureme...
Trips occur when the foot strikes an obstacle during the swing phase of the gait cycle. The critical biomechanical variable associated with tripping risk is Minimum Foot Clearance (MFC). The pattern of toe trajectory in sagittal plane can be changed using different strategies to lift the foot which ...
Soft tissue artefacts (STA) between markers and bones introduces errors in the calculation of foot kinematics. The aim of this study was to quantify STA of markers on the foot and their effect on the calculated foot kinematics according to the Oxford Foot Model (OFM) and Rizzoli Foot Model (RFM). Pa...
There is growing use of foot orthosis (FO) to improve comfort and performance as well as to relieve pain for various pathologies. However, the design of FOs is still based on controversial and uncertain criteria. Previous research evaluated FO based on foot motion and pressure. This is the first stu...
Recently produced vehicles are equipped with functions for driver safety. The Lane Keeping Assistance (LKA) system prevents the vehicle from leaving the lane. However, the operation of the LKA system affects the driving comfort of the driver. In this study, we investigated the relationship between r...
This study investigated the influence of joint angular velocity on time to maximum available torque when contracting from rest. Involuntary contractions were evoked at different velocities, with and without pre-load. In contractions without pre-load, time from rest to 75% of pre-loaded torque got sh...
This study examined the effects of osteoarthritis of the trailing knee on golf performance and rotational kinematics during a golf swing. The study showed that osteoarthritis may cause reduced trunk and knee joint rotations in addition to slower knee rotation velocities, which consequently may cause...
The shoulder joint most often is modelled as a spherical joint that requires accurate localization of the glenohumeral joint center (GHJC) with many clinical, biomedical, and biomimicry implications from injury evaluation to arthroplasty to robotics. We used ultrasound (US) imaging to locate the cen...
The RETRAINER arm system is a rehabilitation device used to facilitate the recovery of arm functionality post stoke. During a randomized controlled trial with 68 subjects, usability and reliability of the system were recorded. This contribution formally evaluates data collected during the trials and...
This study compared video-based joint angle and reach envelope measures for simulated working tasks to motion capture and to physical demands description estimates from novice and experienced ergonomists. Video-based measures showed low RMS error and high weighted Cohen’s kappa scores, and demonst...
We investigated the influence of an American football helmet on axial loading at the cervical spine during low-velocity impacts at eight impact locations to a Hybrid III headform. Compared to bare head impacts, the football helmet condition frequently resulted in increased axial loads at the cervica...
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