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Segmentation of anatomical tissues from medical images is extremely time consuming and is prone to human error. Historically, automated methods have produced insufficient accuracy and have been computationally expensive. This investigation tested a custom two-stage deep learning framework that achie...
We used Non-negative Matrix Factorization (NMF) to discover muscle modules (groups of co-activated muscles) of patients with post-stroke hemiparetic gait before and after gait retraining. Patients who have suffered a stroke often have an impaired gait due to the merging of these modules, which are d...
Chronic ankle instability (CAI) has been associated with kinematic and kinetic deficits during walking. However, few studies simultaneously investigated these two modalities during walking, which is necessary to better understand the deficits associated with CAI. The objective of this study was to q...
After lateral lengthening of the calcaneus patients have different gait patterns during uphill walking compared to healthy subjects. Push-off phase was particularly altered with a more extended knee joint than healthy subjects and a lower ground reaction force compared to the contralateral leg.
Gait phase recognition is of great importance to develop accurate timing feedback for exoskeleton control. In order for a powered exoskeleton to determine and provide proper assistance to the wearer during gait, the user’s current gait phase must first be identified accurately. Deep convolutional ...
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...
This study compares the running mechanics of male and female runners. Motion analysis data and plantar pressure data were collected from healthy runners. Statistical analysis showed no significant differences in joint coordination variability or kinetics between healthy male and female runners.
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...
Misalignment between optimal lengths of individual muscles will affect the force-length (F-L) properties of a group of muscles acting synergistically at a joint. This misalignment can arise from differences in the properties of the muscles and of their tendons. To show how misalignment affects the g...
Performance-based function and self-report (balance, health, prosthetic use) comparisons were made between individuals with transtibial osteomyoplastic (Ertl) and non-Ertl amputations. Functional task results found significantly greater functional ability in those with an Ertl amputation. No differe...
It is important to understand the kinematics of deep knee flexion due to the difficulty patient have performing this activity. bfPCA can describe variability across the entire movement cycle and also identify patterns which a-priori feature identification cannot. The aim of this study was to use to ...
The aim of this study is to investigate how the gait kinetics of elderly change after stair negotiation. The Ground Reaction Force (GRF) during walking can be an important descriptor of human locomotion and can describe disturbance in gait. The GRF measurement of 33 female subjects (70.48±6.66 yrs)...
Our aim is to create a biologically inspired control architecture for human gait. This work combines reflexes with feedforward input from the spine. Reflexes were based on Geyer and Herr [1], except for the vastus, where a stretch reflex was modelled. Additionally, a spinal architecture with a rhyth...
The purpose of this pilot study was to determine differences in gait in cancer survivors with and without neuropathy and healthy controls. Nine cancer survivors with neuropathy, 8 without neuropathy, and 12 healthy controls walked at their normal pace across a walkway. Gait speed, step length, and s...
In this work, a device that can create unstable lifting loads was designed and assessed. The device can create up to 64 N of unexpected load within a crate that is being lifted. This device will be used in the future to examine the effects of such unexpected loads on lumbar lifting dynamics.
Older endurance runners did not display smaller hip kinetics or larger ankle kinetics compared to older non-runners (i.e. a history of running did not mitigate age-related differences in gait kinetics) which may suggest that age-related differences in gait kinetics are a normal and healthy part of n...
The aim of this study is to determine which functional exercises (n=9) shows the largest difference in calculated hip and knee contact force (CF) between hip/knee OA patient groups and the healthy controls (HC). The exercises consisted of level walking, ascending and descending stairs, forward lunge...
People with ankle osteoarthritis (AOA) often seek surgical treatment to ease pain and restore function, and recent research has yielded relatively equal outcomes between the two primary options: ankle fusion (FUS) and total ankle replacement (TAR). One factor missing is the effect footwear has on bi...
Plantarflexor functional deficits are associated with poor outcomes in patients following Achilles tendon rupture. In this study, we established the link between changes in gastrocnemius structure with plantarflexor function 3 months after injury. We found that deficits in peak isokinetic torque wer...
Gait, considered by many, is distinguishable between individuals, making gait a viable security measure. The long-term goal of this research is to identify specific individuals wearing clothing with a high level of accuracy using a convolutional neural network (CNN). In this study, a supervised bina...
This study examined the effect of a concurrent cognitive task on gait termination in older adults. Nine older adults walked and stepped down a curb, and stopped immediately after stepping down if a light stimulus was activated. Trials were performed with and without a concurrent cognitive task. We f...
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...
Subscapularis repair in Reverse Shoulder Arthroplasty is controversial and recent studies showed that it can decrease post-operative clinical scores when used with lateralized glenospheres. In this study a musculoskeletal model was used to investigate how glenosphere lateralization and subscapularis...
Minimal and partial minimal running shoes were both developed to mimic barefoot running. However, different kinematics and kinetics have been reported between these shoes. The purpose of this study was to determine whether peak ground reaction forces (GRFs) and loadrates (LR) during early stance dif...
Five sprinters with unilateral transtibial amputations (TTAs) ran on a treadmill from 3-7 m/s using running-specific prostheses (RSPs) with three different stiffness categories. Sprinters’ step frequency symmetry was not affected by running speed or RSP stiffness. However, sprinters’ contact tim...
Kangaroo rats use vertical leaps to outjump predators. To investigate how these animals achieve higher jumps, we used sonomicrometry (SONO) and electromyography (EMG) techniques in the vastus lateralis (VL) muscle, a large knee extensor, and lateral gastrocnemius (LG) muscle, a large ankle extensor,...
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