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This study tested the concurrent validity of pose estimation from markerless motion capture against those collected using a marker-based technique. Kinematic data were recorded simultaneously while ten male participants walked over ground at their self-selected speed. Sagittal plane joint angles dem...
Seven non-radiographic measurement techniques for sagittal thoracic kyphosis were tested for validity against two radiographic techniques. Non-radiographic measurements were taken with a flexicurve ruler and motion-capture markers. Most measures reported fair-good intraclass correlation coefficients...
The purpose of this project was to determine how countermovement jump performance variables change as a function of skill level in basketball, by comparing them between male high school athletes, NBA draft picks, and professional basketball players. Our findings suggest that greater jump height is f...
Four specimen-specific finite element (FE) models of the knee were developed and validated to investigate ACL injury mechanisms in realistic knee models, providing valuable insight into the inter-subject differences that cannot be captured with generic models calibrated to average data.
Inertial measurement units (IMUs) are one of the most practical alternatives to optoelectronic systems for human motion analysis. Their low price, flexibility, and ease of use make them highly attractive, as they promise to facilitate out-of-clinic patient monitoring and therapy for a wide range of ...
This project determined that, in a sample of NCAA Division 1 men’s basketball players, good vertical jumpers achieve a greater reactive strength index modified (RSIMOD; jump height divided by jump time) via a faster eccentric phase and greater rate of eccentric force development. Among collegiate ...
The relationship between patellar maltracking and instability is poorly understood. Patellar maltracking can be subjectively described, but it is difficult to objectively assess using clinical tests or traditional imaging techniques. Using personalised tibiofemoral (TFJ) and patellofemoral joint (PF...
Markerless motion capture technology has the potential to revolutionize the way biomechanics researchers collect data. By moving data collection out of the lab, new research opportunities previously unavailable will be opened to the greater biomechanics community. Our work utilizing a combination of...
Following anterior cruciate ligament (ACL) injury, altered joint kinematics and moments are often reported, even after long rehabilitation programs, which may lead to increased risk of re-injury. Single leg hop task minimizes the assistance from the contralateral side. The aim of the study was to co...
This study’s objective was to compare lower extremity joint coordination between high-calibre (HC) and low-calibre (LC) ice hockey players during forward stride skating. A 10-camera Vicon motion capture system collected kinematic data on 8 HC and 8 LC players. Continuous relative phase (CRP) was c...
Basketball shots are taken from a variety of horizontal and vertical positions relative to the basketball hoop with and without momentum. Here, we hypothesized that the greater the velocity of the total body, the less the arms need to contribute to the vertical velocity of the ball at release. The r...
New wireless sensors are being developed to help estimate kinetic and spatiotemporal running characteristics, but the relationship between these variables and kinetic variables quantified from ground reaction force (GRF) data are not fully understood. RunScribe variables estimating shock, braking, i...
With recent developments in the resolution with which spine skin-surface motion is tracked, the opportunity presented itself to calculate the effects of creep deformation on spine motion during manual lifting across smaller sub-regions of the lumbar spine. Study results demonstrated that lumbar spin...
Acceleration measures may be collected for entire training sessions in real-world conditions using wearable sensors. The resulting data must be reduced to provide meaningful metrics. The aims of this study were to: (1) quantify the influence of binning methods on a cumulative damage metric based on ...
One premise underlying the use of home-based neurogames is that motion data collected through gaming sensors in the field (i.e., Microsoft KinectTM) accurately represent client outcomes. We evaluate that premise through secondary analysis of kinematic data from a federally-funded project in which a ...
This research sought to determine the minimum number of walking strides required to reliably measure single-task (ST) gait, dual-task DT) gait as well as ST-DT difference scores in older adult fallers and non-fallers. We found that for almost all metrics the minimum number of strides required to acc...
With the aim of early prediction of dementia, a body balance assessment system with integrated virtual reality (VR) has been developed and its construct validity was evaluated for the first time with 14 healthy older adults (OA). We measured their body sway speed in 22 different conditions, intentio...
This study utilized inertial sensors placed on bilateral thighs and bilateral shanks to examine the movement of the four individual segments of the lower limbs during gait in people with unilateral lower limb amputation (LLA). Differences were exhibited between groups based on having amputation at t...
The purpose of this study was to compare anterior cruciate ligament (ACL) injury risk factors between female dancers and female soccer players during single- and double-leg drop landing vertical jump tasks. The female dancers landed with a significantly lower trunk flexion, trunk external rotation, ...
Differences in knee ligament moment arms might contribute to the sex-disparity in knee ligament injuries. We used a population model of the knee to create finite element simulations of varus-valgus rotations and found that the moment arms of the medial and lateral collateral ligaments were smaller i...
Constraining step length and speed in humans can result in pronounced changes in gait, but such situations seldom occur naturally. In contrast, many quadrupeds have pairs of legs with differing lengths. Since these pairs translate at the same absolute speed and stride lengths, they present a natural...
The purpose of this study was to determine whether a countermovement jump could reliably be used as a substitute or dynamometer strength testing. Eighty-six high school basketball athletes were tested, and results indicate that as countermovement jump peak force, power, and impulse increase, peak co...
This study identified compensation strategies in ACLR athletes that persisted across 3 unilateral landing tasks. The injured limbs showed lower internal knee extension moments and increased hamstring activations. These compensations are typically seen as protective as they unload the knee joint and ...
Decreased physical activity throughout ontogeny results in decreases of peak vertical jumping performance but does not alter sub-max VO2 in a bipedal animal model.
Personalisation is crucial in neuromusculoskeletal (NMSK) modelling, especially in understanding neuromuscular disorders, such as cerebral palsy. Nonetheless, commonly used NMSK models rely on scaled generic musculoskeletal anatomies and optimisation algorithms to solve for muscle forces. Consequent...
This work outlines the development and performance of a 3D scanning system incorporating multiple Intel RealSense Depth Cameras. The system can capture time-varying colored 3D scans at up to 60 frames-per-second. Software was developed to align and process images from multiple cameras into a pointcl...
Gait adaptability may be a predicting factor in the outcome of joint replacement surgery. Stepping targets have been used to show a difference in gait adaptability between young and older adults, however not in a test that relates to the rehabilitation of gait after surgery. The aim of this study to...
The objective of this analysis was to compare the biomechanical and electromyographic characteristics of successful vs. unsuccessful manual high-velocity, low-amplitude (HVLA) cervical and upper thoracic spinal manipulations. Manipulations not associated with cavitation of the vertebral joint were c...
The physical properties of motor units (MUs), and the connective tissues into which they are embedded, are important to understanding movement. MU remodelling and loss result from various causes, including neurodegenerative diseases such as Motor Neurone Disease (MND). Involuntary excitation of MUs ...
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