Abstract Archive

The purpose of this study was to describe neuromuscular and kinematic differences between failed and successful single-leg landings. Twenty-four healthy teen athletes completed unanticipated single-leg drop-jump landings on their dominant limb. Failed landings exhibited increased trunk and pelvis fl...

The purpose of this study is to understand variable gearing in medial gastrocnemius (MG) muscle of chronic stroke survivors, as estimated from the “fascicle gear ratio.” Five stroke survivors performed isometric plantarflexions at different ankle joint angles. During each contraction, ankle torq...

The dynamic behaviour of the foot’s medial longitudinal arch (MLA) during running is an important feature capable of storing and returning energy to the system. The possibility of enhancing this feature through training may lead to changes in performance and injury prevention. We conducted a rando...

Researchers recently demonstrated that exoskeleton assistance strategies aimed at keeping the human “in-the-loop” can achieve significant improvements in locomotor performance. Given these findings, we sought to develop an alternative human-in-the-loop strategy rooted in the idea of co-adaptatio...

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Motor control complexity is reduced in individuals with cerebral palsy. However, it is unclear whether the observed reduction is a product of the primary neurologic injury or an outcome from a pathologic gait pattern. In this study, motor control complexity was evaluated for typically-developing (TD...

Collecting and analyzing single view 2D videos could serve as a clinically feasible surrogate to assessing kinematics with 3D motion capture, which is typically used for laboratory research. The purpose of this study was to develop a novel algorithm that tracks markers in 2D videos, and to test the ...

Nonlinear weighting adjustments were implemented to study low back injury potential associated with variable compression exposures. This in vitro study exposed porcine spinal units to cyclic compression paradigms that had consistent and variable peak amplitudes until failure was detected. When weigh...

Peripheral quantitative computed tomography (pQCT) can be used to assess the structural and geometrical changes in bone whilst exposing participants to minimal radiation. Structural parameters are analysed automatically, but geometrical measures are not. pQCT images were converted into binary before...

This paper describes the implementation of an unparalleled large sensor and communications platform along the solar system that we call the inter planetary network (IPN). The proposed IPN consists of thousands of small spacecraft (e.g. CubeSats) strategically deployed around planetary bodies in the ...

The history-dependence of force refers to the reduction or increase in force following active muscle shortening (residual torque depression; rTD) or lengthening (residual torque enhancement; rTE), respectively. It has been shown that rTE is maintained at the cellular level in conditions of reduced c...

Musculoskeletal ultrasound imaging (USI) was used to assess gluteal muscle activity throughout walking gait among healthy individuals, patients with chronic ankle instability (CAI), and lateral ankle sprain “copers”. While gluteus maximus activity was comparable across groups throughout the gait...

The purpose of this study was to determine if alternative functional performance tests are able to detect between limb differences following ACL-R. Participants performed a chair to box test, lateral hurdle hop, single leg forward hop, and 30 second side hop test. The involved limb relative to the u...

In this validation study we investigated the L5/S1 moment estimation performance of an ambulatory measurement system: inertial measurement suit (Xsens) and instrumented force shoes. A top-down (starting at hands) and a bottom-up (starting at feet) inverse dynamic approach were tested. As a reference...

Individuals with a history of whiplash-associated dysfunction (WAD) possess sensorimotor disturbances and a disruption in dynamic standing balance. However, trunk sway reactions have not been carefully investigated between a WAD group and control subjects. The results of this study indicated that th...

Definition of reference frames for the bones articulating at the ankle joint, that can be identified with high accuracy and repeatability, is essential for many biomechanical and clinical applications. Marker-inspired reference frames, representing the majority of exiting reference frame systems pro...

We present an automatic workflow for generating patient specific finite element models of the knee from MRI. A neural network was trained on 20 segmented MRI, and tested on 5 MRIs. A custom python workflow was used to automatically create FE models. The workflow had a mean error of 0.83 mm, and on a...

This abstract expands upon fall detection paradigms to form a more concrete understanding of what is considered a fall. Data was gathered by a waist mounted inertia sensor, consisting of a tri-axis gyroscope and tri-axis accelerometer, from falling events, Full Motion Falls (FMF) and Partial Motion ...

This abstract describes an analysis technique using a single, sacrum-worn inertial sensor to estimate kinetic descriptors of sprint performance. The ability of the proposed technique to assess sprint performance is demonstrated and compared to a previously validated photocell-based method.

Physics-based modeling and dynamic simulation of human eye movements has significant implications for improving our understanding of the oculomotor system. An open-source model of the human eye that can be used for kinematics and dynamics analysis is introduced. This model relies on the passive pull...

This study compared hip muscle geometry (volumes, length), mechanical potential (moment arms), and strength in patients with developmental dysplasia of the hip (DDH) and healthy controls. Results suggest that abnormal bone structure in DDH creates a mechanical disadvantage for muscles surrounding th...

Ergonomically, it is important to understand the benefits and pitfalls of each available alternative or ergonomic seat design to better prevent workplace-associated LBP . However, due to the overwhelming number of alternative or ergonomic seat designs, and individual studies often proving each one�...

Resistance training (RT) can determine changes in muscle and tendon mechanical properties that can now be evaluated properly with Supersonic Shearwave Imaging (SSI). The aim of the present study was to investigate the chronic effect of 8-week RT on Vastus Lateralis (VL) and patellar tendon (PT) mech...

A stability of the elderly population is considered as a major factor for fall risk assessment. A dynamic stability of the elderly population has not been extensively studied compared to a static one due to a technical difficulty. In this study, the zero moment point method (ZMP) is used for analysi...

Knee osteoarthritis (KOA) is a painful and debilitating disease that is accelerated by excessive loading in the joint. Personalized gait modifications that reduce the first peak of the knee adduction moment (P1KAM), can improve joint pain [3], but require visits to a laboratory equipped with expensi...

This paper presents a novel ergonomic design for the 1st metatarsophalangeal joint (1st MTPJ) stiffness measurement system. Although several studies focused on the experimental measurement of the 1st MTPJ range of motion, little attention has been given to the design of the measurement device. Based...

The formation of a micro-damage process zone (MDPZ) ahead of cracks in cortical bone increases its fracture resistance. How extensive this MDPZ forms, is therefore vital to bone's fracture toughness. Using a continuum damage mechanics (CDM) approach, a finite element (FE) model was built to simulate...

We used Computational Fluid Dynamic (CFD) simulations to calculate aerodynamic drag forces, measured the metabolic cost of overcoming small resistive forces and then translated the metabolic savings from drafting to improvements in marathon running performance. We find that every kilometer that an e...

This study aimed to describe the amount, trajectories and reliability of the upper cervical spine mobilisations in axial rotation and flexion-extension directions in terms of combined rotational and translational motion components. Twenty fresh human cervical specimens were investigated in a test-re...