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Traditional occupational biomechanics models of lifting use body posture and hand load to predict L5/S1 compression force estimates. A novel hybrid Bayesian network implementation of a static lifting model has been developed that incorporates disc injury status as well. However, it is unclear how se...
The overall goal of this project is to use computer simulation tools to simulate the impact of radiation therapy (RT) treatment for oropharyngeal cancer. We further describe the advantages and challenges of investigating radiation impact using computer simulation.
In this study, three ankle joint models with increasing level of personalisation are compared within a standard musculoskeletal model (MSKM) of the lower limb, integrated with individual ligaments and articular surfaces from magnetic resonance images (MRI) to assess their anatomical consistency. Kin...
Biomechanical tests aim the understanding of the structure-function relationship often require time-consuming preparation of the samples. During preparation of the tendon samples, occurs an unfavorable effect of sample drying that leads to ultimate dehydration. To invert the impact of tissue samples...
Pre-impact fall detection is extremely important to prevent fractures especially for the elderly. Both fall experiments on 40 young male volunteers as well as dynamic simulations with the human model (HARB) were performed to evaluate pre-impact fall detection algorithm, based on accelerations, angul...
A computer simulation for pedaling movements was conducted. The computer model had the muscles on the lower extremities including the bi-articular muscles, and a neural oscillator controlled the activity of the muscles resulted in joint movements periodically. As a result, the bi-articular muscles c...
A major challenge in neuromechanics, particularly relevant to human health, is linking muscle-tendon (MT) morphology to proprioception. In anesthetized rats, we recorded intra-axonal sensory signals from active MT contractions. To modify the functional morphology, we physically added in-series sprin...
The purpose of this study is to examine the difference in the kinematic profiles during walking between indoor and outdoor environments. Ten healthy young males were participated in this study. The subjects walked about 90m in each environment at a self-selected preferred walking speed. The joint ki...
Even in constrained activities, like pedaling, the indeterminant musculoskeletal system allows for different muscle activation patterns to achieve the same task, which may lead to subtly different kinematics. We found that pedaling coordination patterns differed significantly with respect to experie...
In ten-pin bowling, bowlers try to knock down ten pins, with the allotted two tries. The present study investigated full-body kinematics and kinetics in the lower extremities in elite ten-pin bowling. Our study showed novel findings regarding how elite bowlers changed kinematics over time during the...
The purpose of this study was to distinguish subjects with different shoulder disorders, using musculoskeletal simulation with movements of clinical physical examinations.
A passive strain sensor was developed to wirelessly measure musculoskeletal soft tissue strains in vivo. The sensor sensitivity and signal stability were evaluated under uniaxial strain. The feasibility of wireless tendon strain measurement was successfully demonstrated by implantation in an ovine c...
In this study, we developed a prototype of the anterior cervical plate (ACP) with blocking pin made of shape memory alloy to facilitate insertion and removal of screws and conducted a mechanical strength test and finite element (FE) analysis to evaluate biomechanical stability. The test results show...
We assessed the accuracy of non-rigid image registration algorithms to quantify the three-dimensional deformation of the human medial gastrocnemius muscle from MRI scans of the muscle at rest and during isometric contractions at 10% and 20% of maximum voluntary isometric plantarflexion torque. Demon...
The aim of this study is to measure the gait features and global position of the pedestrian in the outdoor environment by using shoe attached IMU sensor and GPS, and visualize the stride length on a geographical map in order to investigate the explicit factors in the walkway that changed the gait pa...
Achilles tendon shear wave speed was measured in 16 young and 16 older adults walking at speeds ranging from 0.75 to 1.5 m/s. Subject-specific calibrations were performed and used to estimate tendon stress from wave speed. We observed a consistent and substantial decline in tendon wave speed and str...
We examined differences in submaximal quadriceps force control between test protocols and the relationship between quadriceps force control and pain and function in individuals with knee osteoarthritis (OA). Ten participants with symptomatic and radiographic knee OA were recruited. Self-reported pai...
Although the concept of coordination has received much attention, research on bilateral coordination between limbs has been focused on the upper extremity and reciprocal motion of the lower extremity. The bilateral occurrence of ground reaction forces presents an opportunity to investigate kinetic b...
Studies of localized muscle fatigue (LMF) under varying physical workload conditions often necessitate experimental testing on multiple days. This study evaluated objective and subjective LMF responses during an identical elbow flexion fatigue protocol on three repeat visits to the laboratory. We fo...
We have developed a robotic haptic cycle ergometer as a probe for coordination in the lower limb and a therapeutic intervention for central deficits such as stroke. Here we demonstrate motor adaptation and skill learning in leg movement through two haptic training tasks. The first shows motor adapta...
A hallmark of human movement is its variability, reflected in normal fluctuations in motor performance that occur across multiple repetitions of a task (e.g. stride-to-stride, pedal cycle-to-pedal cycle). To better understand how skeletal muscles are recruited for different movement tasks it is ther...
A new energy storage and return insole has been developed with the goal of reducing musculoskeletal injuries by decreasing impact loads at heel strike while also assisting gait by releasing stored elastic energy during toe off. This pilot study analysed a single subject walking on an instrumented tr...
Optimization techniques solve the muscle redundancy problem assuming some performance criterion, such as muscle activation, force, stress, metabolic energy or joint contact forces determines muscle coordination. However, it is not yet clear which criterion describes muscle coordination and contact f...
Forces in the gastrocnemii, quadriceps, and hamstrings and tibiofemoral axial contact forces estimated by a deterministic model are compared to instrumented prosthesis measurements and EMGs and demonstrate reliable results.
This study presents an accuracy evaluation for kinematics and kinetics of a four-segment biomechanical model of the human body during quiet standing measured using wearable inertial sensors against those measured using motion capture and force plate. No significant differences were observed between ...
We used statistical parametric mapping to test differences in spine and lower limb 3D kinematics in people with and without low back pain during functional tasks. Our results indicate differences in movement of the lower thoracic segment, upper and lower lumbar segment and knee joint throughout walk...
We aim to determine whether intermittent theta burst stimulation (iTBS) has potential to promote motor re-education. We found iTBS to have a facilitatory effect on biceps corticomotor excitability in individuals with spinal cord injury (SCI) and an individual with SCI and upper limb reconstruction. ...
Exoskeletons reduce whole-body net metabolic rate by modifying limb-joint biomechanics. Yet, muscles, not limb-joints, are the primary consumers of metabolic energy during locomotion. Perplexingly, it is unestablished how exoskeletons alter muscle dynamics to improve locomotion economy. We investiga...
The objective of this study is to restore a gastrocnemius-like ankle-knee coupling to individuals with lower limb amputation (ILLA), then 1) characterize how different gastrocnemius dynamics (e.g., stiffnesses) affect whole-body gait biomechanics and 2) explore which gastrocnemius behaviors are most...
It is an undeniable fact that musculoskeletal systems are inherently redundant, i.e., there are more degrees of freedom than those required to perform certain tasks and each degree of freedom is actuated by multiple muscles. This over-availability poses numerous challenges in the process of modeling...
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