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It was proposed that muscle force is related to metabolic cost of gait. A knee exoskeleton, harvesting different amounts of energy, modulates the metabolic costs, during gait. We used musculoskeletal modelling and simulation to estimate muscle forces changes due to the energy harvesting levels. Mean...
A feature selection method has been developed to characterize individual performance of locomotor activities of daily living. The method has been applied to angular and inertial data recorded with a novel 3D printed wearable device. Feature selection optimization through systematic removal of featur...
This study uses a previously validated computer simulation (finite element model - FEM) of a healthy rhesus macaque to test the effect of fracture repair implants (plates and screws) on bending and deformation (stress/strain) in the mandible (lower jaw) during chewing. The results of our FEM provide...
There are many factors that can influence concussion recovery, including the sex of the patient, thus necessitating sex-specific analyses. Few studies have investigated concussion recovery between sexes using objective outcomes as a measure of recovery. We examined the association between sex and re...
Evaluating what biomechanical changes influence the incidence of low back pain (LBP) in servicemembers with an amputation is a multifactorial issue. The goal of this study was to examine the biomechanical contributions in patients that self-report LBP and compare to patients with amputation who do n...
With prescription of a carbon-fiber Intrepid Dynamic Exoskeletal Orthosis (IDEO), patients receive specialized functional training. Presumably, this increases the capacity to perform work in the brace and decreases demand in the remaining lower extremity constituents. By looking at the absolute brac...
This study compared the accuracy, precision and consistency of unilateral transtibial amputees (UTAs) stepping in to a floor-based target against able-bodied participants. UTAs exhibited reduced precision and consistency during the task, meaning they may find required changes in foot placement inher...
Kinematics of the prosthetic tibiotalar joint in total ankle replacement (TAR) patients have yet to be measured using dual fluoroscopy (DF). These data could improve our clinical understanding of failures in TAR patients, leading to better surgical approaches and implant designs. With dual fluorosco...
Loading mechanics after anterior cruciate ligament reconstruction is said to lead to the progression of knee osteoarthritis. Early inflammation biomarker levels and patient reported levels of pain predict poor loading mechanics 6 month post-surgery during running in those who have undergone anterior...
Activities of daily living (ADL) require rotator cuff muscles. Architecturally and neuroanatomically distinct partitions within these muscles demonstrate differential activation in moderate-to-high demand tasks. However, partition activation during ADLs is unknown. This study investigated supraspina...
Few studies to date have examined the scaling of gait parameters with respect to body mass in humans of varying body sizes. This study examined how vertical and leg stiffness scale in 40 healthy adults. We calculated scaling exponents for vertical and leg stiffness from kinematic and kinetic data us...
[Purpose] The purpose of this study was to investigate the effect of Rocker Sole (RS) with Pivot Point (PP) on the metatarsal head (MTH) on lower extremity joint angle during gait. [Methods] Ten healthy men underwent three-dimensional gait analysis while walking wearing RS and postoperative shoes (P...
This study investigated the role of anterior pericapsular musculature during hip flexion in people with and without femoroacetabular impingement syndrome (FAIS). Differences in iliocapsularis muscle activity during peak hip flexion were suggestive of a potential dynamic role on the joint capsule in ...
Several biomechanical variables have been linked to running economy, in addition to extrinsic factors such as footwear. Experienced runners performed treadmill running on separate days and in different footwear: minimal, neutral cushion, and highly cushioned. Running kinematics and running economy (...
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...
Maximal back extension force of the participants was measured using a dynamometer while standing barefoot and on top of two insole conditions (AUTO and DELTA insoles). Only DETLA insole demonstrated a significant positive effect on back strength. We found that most subjects improved their force prof...
The impact of knee laxity following total knee arthroplasty (TKA) on post-operative knee dynamics is not fully understood, and knee kinematics and kinetics likely influence patient perceptions, clinical performance, and component wear. The purpose of this study was to characterize intra-operative kn...
Abrupt deceleration is a common practice in several sports, where sudden changes of direction are needed to perform at the highest level. The aim of this work is to estimate muscle forces and muscle contributions to the acceleration of the center of mass during a rapid anterior/posterior (A/P) decel...
A 12-hour work day produces changes in the cognitive performance of workers. The case of air traffic controllers without doubt is an occupation of high cognitive and security demands. Postural control is influenced by the cognitive state of people. In the present study, differences in spontaneous po...
The history-dependence of force refers to the reduction or increase in force following active muscle shortening (residual torque depression; rTD) or lengthening (residual torque enhancement; rTE), respectively. It has been shown that rTE is maintained at the cellular level in conditions of reduced c...
A complete understanding of the specific sequence of mechanical and biochemical events, especially in a dynamic environment, is lacking. The goal of this study is to measure chondrocytes deformation in situ when dynamic mechanical loads of physiological relevance are applied. The measurement system ...
How localized fatigue at different muscles affects whole-body coordination during a repetitive task is poorly understood. We studied 17 participants who completed a repetitive task before and after fatigue was induced at either shoulder, elbow or lower back. Results show that fatigue location differ...
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...
Three-dimensional (3D) finite element analysis (FEA) was used to quantify the forces transmitted in the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL) during non-resisted and resisted ankle internal/external rotation (NIER and RIER). Four healthy male subjects were recruited...
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,...
Individuals with spinal cord injuries (SCI) who use manual wheelchairs (MWCs) are more susceptible to shoulder pathology than able-bodied individuals. A gap in knowledge exists in understanding how shoulder function of MWC users during daily living compares with the able-bodied population. To start ...
Downhill walking is an inevitable part of daily living and causes higher knee joint loading compared to level walking in young healthy populations. The purpose of this study was to compare knee biomechanics of the replaced limb to the non-replaced limb of TKR patients and healthy controls during wal...
Anterior shear forces and valgus moments at the knee expose the anterior cruciate ligament (ACL) to high loads. Knee joint loads are largely produced by muscles, but the contribution of individual muscles to knee joint loads during potentially injurious movements, such as single leg landing, is not ...
Surface electromyograms (EMG) are susceptible to motion artifacts, especially during dynamic non-isometric contractions. A novel method is presented for detecting motion artifact contamination in EMG recordings. Specifically, root mean square (RMS) amplitudes of EMG recordings with two high-pass cor...
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