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Plantar pressure during gait and plantar fascia shear modulus were assessed in participants with plantar fasciitis and active pain, and participants with a history of plantar fasciitis, but no current pain. There were moderate relationships between plantar pressure under the 1st MH and shear modulus...
The aim of our literature review is to identify the gaps between research outputs, clinical practice, and daily behavior in the rising from a seated position movement of the elderly, and to outline future directions for research on this motion to address issues with an ageing population. A literatur...
The study proposed a model-based tracking procedure integrating an asynchronous biplane imaging system, motion compensated frame interpolation and two different image registration strategies, namely forward-projection and backward-projection methods, for measuring 3-D dynamic joint motion. Successfu...
Muscle and knee forces were estimated for a female athlete performing a drop vertical jump (DVJ) to quantify tibial anterior shear force (ASF) during landing. The contribution of the gastrocnemius muscle to peak ASF was assessed. The gastrocnemius wrapping around the posterior aspect of the tibia co...
Effective prosthetic socket design following lower-limb amputation depends upon the accurate characterization of the residuum shape and volume fluctuations. This study proposes a novel framework for measuring and analyzing residuum shape and deformation, using a high-resolution low-cost system. A mu...
Common post-mastectomy breast reconstructions require the removal of key shoulder muscles, which can alter shoulder biomechanics and may affect a patient’s ability to perform activities of daily living. However, the extent to which post-reconstruction shoulder biomechanics influences clinical outc...
We think of agility as the ability to move at fast speeds while executing motor control strategies that redirect body motion and reposition limbs. Jumping to high heights and to long distances correlates with other aspects of agility, such as maximum sprint speeds. To gain intuition on how the legs ...
The aim of this study was to investigate the site- and joint angle- dependence in the elastic properties of the iliotibial band (ITB). The stiffness of ITB was measured on five sites of the right lower limb with nine combinations of hip and knee joint angles using ultrasound shear wave elastography ...
The study aimed to quantify measurement errors in knee joint translations owing to soft tissue artefacts and test the linearity of the errors against the flexion angle. Results showed that the errors were largely proportional to the flexion angles, which may be compensated.
We introduce a simple experimental paradigm for estimating Achilles tendon stress and calibrating the wave speed squared-stress relationship for individual subjects. We observed strong linear relationships between wave speed squared and stress for 32 subjects, with some task- and subject-specific va...
Flatfoot is a complex multi-plane deformity of the foot, but is often classified using planar foot prints. A novel foot sole scan system (FAST) enables fast measurement of the three-dimensional foot sole surface and thus relevant morphological parameters. The current study aimed to assess the intra-...
This study reports the effectiveness of a 6-week ankle training program using a stiffness-controlled robotic platform on paretic ankle motor control and lower extremity function in stroke patients. Two chronic stroke subjects with right hemiparesis participated in training for 12 sessions over 6 wee...
Endurance athletes commonly believe that shifting from running to cycling participation will reduce injury risk. However, overuse injury rates in these two sports are very similar [1,2]. A dynamical systems approach was performed to assess how segment coordination variability differs between running...
Muscular power is reduced with fatigue [1,3]. During cyclic contractions muscular power is highly dependent upon force-velocity characteristics (F0, Vmax, curvature) and activation-deactivation dynamics [2], which change with fatigue [1,3]. Determining the contribution of changes to each characteris...
Scaling approach can vary between modellers, which in turn can affect the results of gait analysis. We hypothesised that the use of the MAP Client (developed at the ABI) could reduce the variability between modellers for the same subject motion data. After having multiple scalers use both this tool ...
Shoulder mechanical impingement is a possible contributor to shoulder pain in individuals with spinal cord injury (SCI) who use a manual wheelchair (MWC). Biplane fluoroscopy and model-based tracking were used to measure the subacromial space during daily tasks in MWC users, and impingement risk was...
The human gait dynamics in sagittal plane can be reproduced by a spring-loaded inverted pendulum (SLIP) model. If the center of mass (CoM) dynamics in frontal plane are describable by spring-mass dynamics, 3D expansion of the SLIP model will be valid. In this paper, we described CoM dynamics of fron...
While a human’s preferred walking speed is understood to arise from energy optimization, energy criteria alone do not explain how task-level requirements such as speed regulation are maintained in the presence of neuromotor noise and motor redundancy. Here, we employ a 3D dynamic walking model and...
Daily use of a manual wheelchair (MWC) has been identified as a potential source of shoulder pain in individuals with a spinal cord injury (SCI). Compression of the rotator cuff soft tissue beneath the coracoacromial (CA) arch is hypothesized to contribute to this pain. This study aimed to determine...
In this study, we tested for differences in torque, electromyographic activity (EMG), and the associated neuromuscular efficiency (NME) between isometric voluntary contractions of elbow flexors preceded and not preceded by a lengthening contraction. The dependence of such differences on (i) stretch ...
This study aimed to investigate how the variability associated with human-provided physical assistance impacts patient locomotor training outcomes. To this end, a cyberphysical rehabilitation system was developed that allowed assistive forces to be rendered on patients by either a human therapist or...
Reliable and accurate localization and pose recovery of objects (bones and fiducials) in a high-speed biplanar X-ray system is dependent on an adequate model of the imaging chain. This work investigated the contributions of multiple sources of calibration errors in the chain. The results provided in...
Limited research has investigated sex differences in muscle activation, especially in the upper extremity. This study used high-density electromyography to investigate sex differences in activation of the clavicular (PecC) and sternocostal (PecS) regions of the pectoralis major in three different ar...
Objective: To investigate the effects of different vibration amplitudes combined with the unstable surface from four to eight weeks of training on the single leg balance ability. Methods: Sixteen college gymnasts were randomly assigned to a high-amplitude 4mm group (High) and a low-amplitude 2mm gro...
Free Achilles tendon shape and 3D geometry measured using MRI and 3DUS are similar. 3DUS may be a better alternative to MRI for measuring free Achilles tendon geometry due to faster acquisition time and higher image resolution.
In this study, we explored and verified a simple approach to simultaneously penalize both muscle activation and joint contact loads within OpenSim. By adding additional degrees of freedom (DOF) to a joint of interest and providing sufficient strength for “contact” actuators along these DOF, we d...
Developing a method to quantify and improve the “fit” of a prosthetic socket would presumably enhance the function of a person with a transfemoral amputation (TFA). Previous studies have found a correlation between increased socket pistoning, the movement of a prosthetic socket relative to the r...
There is little known about the mechanical effects of blood flow on finger flexor tendon (FDS) and subsynovial connective tissue (SSCT) motion. Ultrasonography recorded tissue motion during middle finger flexion-extension cycles with subdiastolic venous occlusion at two speeds. Occlusion altered FDS...
While laboratory studies provide a rich literature on cognitive and physical performance under strenuous conditions that simulate some of the mission relevant conditions Soldiers are asked to perform, there is additionally a need to assess relevant biomechanical, physiological and cognitive metrics ...
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