Abstract Archive

Our aim was to provide evidence that the Landing Error Scoring System (LESS) – an injury-risk screening tool – can be automated using deep-learning based computer vision combined with machine learning methods, and compare LESS prediction between cropping and machine learning methods. 2D videos f...

Counter-movement jump height along with several kinetic and kinematic measures, decreased following an acute fatigue protocol. However, single-subject analysis revealed that four participants jumped higher following the fatigue protocol as a result of generating greater concentric impulse.

We used a haptic device to measure the influence of prosthesis type and feedback type (visual, vibration, force) on performance during a grasp-width matching task in five upper limb (UL) prosthesis users. All forms of feedback improved performance over the no feedback condition for each limb type. H...

Our goal was to estimate the lower limit on the net metabolic cost of transport (MCoT) in human walking. We found the muscle forces of a musculoskeletal model that minimized the total positive muscle fibre work, under the constraint that the net joint torques were equal to those obtained from experi...

A methodology to decompose three-dimensional (3D) muscle geometries in lines of action (or fibres) is presented and applied to models of hip-spanning muscles segmented from magnetic resonance imaging (MRI). Kinematic simulations of functional movements of the hip joint were performed and the fibresâ...

We propose a method to estimate kinematics, kinetics, and muscle forces by tracking inertial sensor data with a musculoskeletal model and a trajectory optimization approach. High correlations with a conventional analysis (optical motion capture and force plate) were achieved for walking and running ...

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...

Hip muscle weakness is a risk factor for many musculoskeletal injuries to the hip and groin region. Instruments used to measure hip muscle strength are designed to assess muscle actions in a single plane, which is not consistent with the multiplanar line of action of many hip muscles. This study aim...

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 ...

postural control during tasks of quiet standing, especially in the presence of sensorial deficit. Dance interventions have been shown to have a positive impact on postural control. Thus, the aim of the current project was to evaluate the effects of a dance intervention on postural control in individ...

We studied the effects of bilateral triple arthrodesis (BTA) on the strength of soleus and peroneus brevis muscles, and on knee flexion/extension during gait using EMG and a kinematic model of the lower limb. We found that the maximum knee flexion and extension was reduced in all patients compared t...

The biological ankle joint can change its stiffness in response to various locomotor tasks (e.g., load carriage), but the direct effect of ankle stiffness on metabolic power during various tasks is not fully understood. We evaluated the effect of ankle stiffness during load carrying tasks on metabol...

The aim of this study was to quantify 3D hip, knee, and ankle joint work during incline and decline slope walking. While the majority of work occurred in the sagittal plane, substantial contributions were also seen in the transverse and frontal planes, especially for declines. At the hip, transverse...

Prolonged exposure to optical flow perturbations designed to elicit the visual perception of instability during walking in the safety of virtual reality may enforce task-specific, reactive balance control in older adults with potentially favorable aftereffects. This proof of concept study alludes to...

We examined the effects of carrying various loads with one hand (up to approximately 10 kg) for a distance of approximately 6 m on trunk kinematics and kinetics among older and obese males. Three-dimensional (3D) trunk angles and moments about the L4/L5 vertebrae were calculated. Results suggest tha...

Determining weights among terms in the cost function for walking was formulated as a bilevel optimization problem (BLO). The direct collocation (DC) method effectively solved the lower level problem, making it practical to solve the BLO using a nested evolutionary approach.

This study presents findings from a descriptive video analysis of in-game head impacts in youth football. Parameters detailing each head impact (e.g., frequency, type, mechanism, source, location, etc.) were reviewed and documented for three different age groups (≤ 12 years). A trend towards youth...

We studied walking on a simulator designed for gaming where the subject moves by sliding his shoes on a concave surface. The metabolic cost is (about 3-5 times) higher compared with ‘normal’ walking and walking speed is lower than on treadmill at matched stride frequency. Total mechanical work i...

Increased gait variability in older adults has been found to increase fall risk. We propose that older adults can reduce gait variability by performing a lateral stepping training. Fourteen older adults aged 65+ underwent a six-week lateral stepping training 3-days/week. Gait variability was measure...

This work evaluated the effects of grip force magnitude and forearm muscle activity on wrist kinematics in response to sudden wrist perturbations. A haptic wrist robot delivered perturbations that caused wrist flexion, extension, radial and ulnar deviation. Prior to each perturbation, participants p...

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...

Trunk co-activity can indicate coordination and stability. However, historical agonist-antagonist approaches to co-activity can over-simplify multi-planar, functional, and otherwise complex tasks. Here we present a flexible co-activity measure that expands the two-muscle case of co-activity to multi...

We investigated differences between medial gastrocnemius and soleus muscle contractile behaviour during walking under conditions strategically designed to augment the demand for forward propulsion. Ten young adults walked on a treadmill at 1.2 m/s both normally and with: (i) a 5% horizontal aiding f...

The paper presents an example of a successful use of 3D motion analysis for forensic purposes, and tries to show the cases in which this analysis is helpful and offers opportunities to law enforcement agents. In the present case of a shotgun hunter a fundamental question was asked - was there someon...

Various types of cognitive challenges that may influence neuromuscular control may arise during athletic participation. We examined the effects of divided attention and memory challenges on knee loading during a jump landing task. Participants demonstrated less knee flexion when visual attention was...

Falls are common in people with multiple sclerosis (PwMS) and important predictors of experiencing a fall include fatigue and balance. While fatigue fluctuates, clinicians rely on self-report measures administered at discrete time points to assess fatigue and by extension, fall risk. Wearable inerti...