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This study tested a novel upper limb weight support device with a participant living with stroke. Outcome measures were feasibility of the device with the user and movement with and without the device.
Recent reports have suggested that high loading rates, typically associated with a rearfoot strike (RFS) pattern, during running may be related to overuse injuries. With the recent increase in wearable sensors it is important to identify paradigms where footstrike pattern (FSP) can be detected from ...
Inverse dynamic (ID) analyses of baseball pitchers have assumed body segment inertial properties scaled from total body weight and segment lengths. In our recent study [1], use of dual energy X-ray absorptiometry (DXA) segment masses produced higher shoulder kinetics than use of scaled masses. The a...
When stepping over obstacles, diverted gaze may reduce the ability to gather visual information and impair performance. The study examined how diverted gaze affected young versus older adults. Participants completed two tasks (standing, stepping over an obstacle) with a simple reaction time (RT) tas...
Postural control and balance are challenging tasks for lower limb prosthesis users due to the absence of somatosensory data from the amputated side and limitation of a prosthetic device in comparison to the natural lower limb. A study was developed to evaluate the standing balance of above-knee pros...
Incorporating realistic skeletal kinematics and tissue property data into musculoskeletal models can improve the accuracy of mechanical load estimates. However, inclusion of subject-specific skeletal kinematics in vivo in the models may heighten the demand on the quality of tissue property input dat...
High peak axial tibial acceleration has been associated with tibial stress fracture in gait laboratory studies. Mobile monitoring indicates tibial acceleration increases when running outdoors compared to in the laboratory. Thus, careful interpretation of field-based values is needed with replication...
A multiscale modelling approach, which combines musculoskeletal simulations of a person’s gait and finite element analysis (FEA), can be used to predict proximal femoral growth. Before this workflow can be used in patient populations to answer clinically-relevant questions, it is of utmost importa...
We present initial performance metrics of a robotic system for in vitro simulation of 3D physiologic human shoulder motion. Scapular and humeral positions and orientations in the cadaver were driven by 3D human shoulder motions acquired using a biplane fluoroscopy system. An industrial robot base al...
Bones’ structure and strength are highly regulated in response to local bone strains, caused by muscle and inertial loading during movement. In order to examine the osteogenic stimulus provided by different habitual activities and exercises we measured human tibia deformation in vivo using motion ...
Biomechanical changes in gait as a result of pregnancy have been studied in walking but not running. Thus, the objective of this pilot study was to examine changes in running mechanics, particularly at the pelvis and trunk, between pre- and post-pregnancy as well as changes in running habits. At 6-w...
Due to the anatomical structure of Achilles tendon, it has been hypothesized that muscle force imbalance within the triceps surae (TS) muscle group may play a role in the development of Achilles tendinopathy. The aim of this study was to determine if the sharing of force production within the TS dif...
The diaphragmatic ligament (DL) provides the pressure barrier separating thorax from abdomen in mammals. It has a microarchitecture that resists hoop stresses and herniation and provides a biaxial elastic layer of elastin. Modelling of the microarchitecture reveals how the ligament could transpose i...
Biomechanical changes as a result of minimal running have been studied in different aspects but not gender. Thus, the objective of this pilot study was to examine: a) gender interest and participation in this training approach; b) gender responses to a 12-week barefoot running training. Female runne...
Heel pad can absorb shock during gait as heel pad can dissipate the energy. According to the researches, the stiffer heel pad has the elevated energy dissipation. In this study, the heel pad stiffness variation was measured as the distributed force on the heel pad was increasing. As a result, the he...
A computational model was developed to simulate hopping at different gravity levels. The hopping frequencies that minimized energetic cost at each gravity level were determined. Even though the optimal frequency was not expected to change with gravity, we observed that lower gravity levels had lower...
In order to ascertain the significance of spine stability in holding the upright-standing posture after focal muscular disuse atrophy, two optimization-driven approaches were employed to develop kinematics-driven (KD), and stability-based kinematics-driven (SKD) musculoskeletal (MS) models of an adu...
The in vivo elongation patterns of the medial (MCL) and lateral (LCL) collateral ligaments following total knee arthroplasty (TKA) were investigated during level walking and squatting using moving video fluoroscopy and subject-specific modelling. Furthermore, a Monte Carlo analysis revealed the in v...
Recent experimental studies of human walking have shown that within an individual step the pelvis (CoM) state can be used to predict the next foot placement. Here, we used a simple open-loop-stable 2D walking model to show that one cannot take this predictive ability, by itself, as evidence of activ...
Foot orthoses (FOs) are commonly used to alleviate several pathologies. Their design will affect differently lower limb kinematics. Additive manufacturing, 3D printing, makes it easier to provide innovative geometries of customized FOs in accordance to patient-specific needs. This study aimed at est...
The aim of this study is to determine the forearm muscle activity and fatigue depending on the type of mouse during a long-term computer mouse task. Musculoskeletal disorders can be caused by persistent muscle load when working with computer mouse in a non-neutral posture of forearm. Although a vert...
Age-related differences in stride length variability during an incremental walk-to-run transition (WRT) treadmill protocol revealed that walking may only mature by 13 years old and running may not mature until 15 years old. When analysing how gait patterns are regulated in response to increasing gai...
Differences in running biomechanics between males and females and between stable and unstable surfaces may have implications for overuse injury. The purpose of this study was to determine whether differences in biomechanical patterns between running surfaces depend on sex. A Principal Components Ana...
This study examined the association between knee joint contact forces during gait and 3-year radiographic knee osteoarthritis progression. An EMG-driven model was used to obtain muscle and knee joint medial and lateral contact forces for 16 individuals with knee OA at baseline. Our results demonstra...
Finite element models have been used to study the mechanical responses of the equine hoof. The hoof is made up different tissues, including the sole, flexor and extensor tendons, frog, navicular bone, middle phalanx, hoof wall, distal phalanx, laminar junction, and digital cushion [1]. These tissues...
Rowing involves continuous repetitive motion and high intensity loading on the glenohumeral (GH) joint. These factors significantly influence performance and injury propagation. This is the first study to specifically explore three-dimensional shoulder biomechanics with motion capture and musculoske...
Cervical spine kinematics obtained from four in vitro loading conditions were compared to in vivo kinematics with respect to the instantaneous center of rotation (ICR).
The force velocity relation (f-v-r) of the human gastrocnemius medialis was assessed using maximum voluntary preactivation prior to shortening at different angular velocities. Compared to previous work, preloading resulted in increased torque outputs and clearly decreased slope characteristics of th...
Patient-specific computational models of the knee joint have the potential to diagnose the early onset of osteoarthritis and help surgeons in identifying the appropriate intervention to mitigate or prevent disease progression. An in vitro subject-specific finite element model of a human knee joint w...
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