Browse through the abstracts, view author details, associated sessions and more. Vote on abstracts to increase their chances of being presented in a session. You need to have an account before you can vote!
We investigated the effect of movement speed and load on motor unit firing behaviour during repeated flexion/extension contractions of the Biceps Brachii. At all speeds and loads, greater motor unit firing rates were observed during the concentric vs. eccentric phases of the movement. However, diffe...
Gait deviations seem persistent after total knee arthroplasty (TKA). The gait of TKA patients and asymptomatic controls are commonly compared at their comfortable walking speed (CWS). We aim to identify deviating gait biomechanics of TKA patients that are not contaminated by differences in gait spee...
The purpose of this study was to determine the association between corticomotor excitability (CME) of the gluteus maximus (GM) and the average hip extensor moment during single-leg drop jump. Thirty-two healthy individuals (17 females, 15 males) participated. The slope of the input-output curve obta...
The relative muscle volume is the critical parameter to estimate the contribution of individual muscle on joint torque. Because muscle hypertrophy is prominent in the fast than slow twitch muscle, it is hypothesized that the relative muscle volume of triceps surae may vary among subjects according t...
Falling of the elderly has become an important issue in today's aging society. The key task to prevent falling is the exact detection of a falling event in Activities of Daily Living (ADL). However, certain ADL situations are difficult to classify due to motion and acceleration values of the fall si...
Lately there has been some frustration with academic publishing, highlighted by Europe's "Plan S" and University of California libraries considering to unsubscribe from all Elsevier journals. With the abilities of the internet, growing presence of science on social media, and the increased use of pr...
Humans rapidly adapt gait to minimize energetic cost, but no direct metabolic sensors can account for this. Dynamic walking principles and tibialis anterior (TA) muscle activation profiles suggest it may be used in indirect sensing of energetic losses during the collisional phase of walking. Prelimi...
Interventions to prevent falls have been a major focus of research in recent years. We propose that older adults can improve performance in common clinical measures of balance by performing a lateral stepping training. Fourteen older adults aged 65+ underwent a six-week lateral stepping training 3-d...
Older adults experience both sarcopenia and altered propulsive power generation during walking. To examine if non-uniform sarcopenia effects correspond with functional gait changes, we measured individual triceps surae muscle volumes in young and old adults. While muscle volumes were smaller in olde...
Achilles tendinopathy is an overuse injury that is associated with increased risk of tendon rupture. There is an urgent clinical need to identify predicting risk of injury. Using a combined biomechanical loading and ultrasound imaging model, we mechanically fatigued cadaveric Achilles tendons and fo...
The geometry of the talus bone is important to implant design, talar disorders. Our recent work has shown that the talus bone has the same shape among individuals and thus a template with different sizes can be used as a replacement. The current study aims to find the shape of the template based on ...
This study is seminal in providing long-term functional outcome evaluations of single-event multilevel surgery (SEMLS) in children with cerebral palsy (CwCP, specifically bilaterally spastic CP). It presents a novel multidimensional representation demonstrating that all sagittal joint angles, on bot...
In this investigation of 20 knees, part of a prospective study of surgical technique and outcomes of total knee arthroplasty, we observed no significant correlation between anterior femoral translation during passive knee flexion, measured intraoperatively, and peak involved knee flexion moment duri...
Humans and chimpanzees walk quite differently, and it is unclear how posture and morphology influence the distinct gait patterns observed between species. We instructed humans to walk with various crouched postures to imitate the bipedal gait patterns of chimpanzees. While kinematics and ground reac...
Trunk co-activity can indicate coordination and stability. However, historical agonist-antagonist approaches to co-activity can over-simplify multi-planar, functional, and otherwise complex tasks. Here we present a flexible co-activity measure that expands the two-muscle case of co-activity to multi...
A methodology to decompose three-dimensional (3D) muscle geometries in lines of action (or fibres) is presented and applied to models of hip-spanning muscles segmented from magnetic resonance imaging (MRI). Kinematic simulations of functional movements of the hip joint were performed and the fibres...
Prolonged exposure to optical flow perturbations designed to elicit the visual perception of instability during walking in the safety of virtual reality may enforce task-specific, reactive balance control in older adults with potentially favorable aftereffects. This proof of concept study alludes to...
The purpose of this study was to investigate bilateral lower extremity (hip, knee, ankle) and distal lead foot kinematics during transition step negotiation in young women (YA) and older women with (OFH) and without (ONF) a fall history. Participants in the YA (n=6), OFH (n=4), and ONF (n=3) groups ...
Persons in symptom remission from recurrent low back pain (rLBP) and back-healthy persons performed a single-limb dynamic balance task with and without a concurrent mental math task. Thorax and pelvis frontal plane motion was less coupled in the group in remission from rLBP and was associated with t...
We investigated differences between medial gastrocnemius and soleus muscle contractile behaviour during walking under conditions strategically designed to augment the demand for forward propulsion. Ten young adults walked on a treadmill at 1.2 m/s both normally and with: (i) a 5% horizontal aiding f...
The muscles operating closest to their functional limits produce the “weak link” for locomotor ability. This study shows that both young and old adults operate at a much greater relative effort at their ankle plantarflexor than knee extensor muscles during walking and running. This suggests that...
This literature review and meta-analyses show that there is a statistically significant elevation in Metabolic Cost of Walking (MCoW) between healthy young and elderly for both gross (12%) and net costs (17%) of walking. However this elevation is possibly confounded by an interaction between age and...
The aim of this study was to quantify 3D hip, knee, and ankle joint work during incline and decline slope walking. While the majority of work occurred in the sagittal plane, substantial contributions were also seen in the transverse and frontal planes, especially for declines. At the hip, transverse...
Because of the epidemiological incidence of Anterior Cruciate Ligament (ACL) injuries and the high reinjury rates that occur when returning back to sports, what criteria should be used to return the athletes to sports after ACL reconstruction is still an open issue. Neuromuscular risk factors have p...
Foot progression angle (FPA) is the angle of the foot when in contact with the ground, relative to the direction of walking. Modification of FPA is a possible management strategy for knee osteoarthritis; however, measurement of FPA is typically confined to the lab environment. We have tested the val...
The maximum energy equivalent strain (EEQ) produced during running was positively associated with bone changes to distal tibia region that occurred during training for a first marathon. However, mean EEQ showed negative effects. Additionally, age, gender, height, and mass contributed significantly t...
Bilateral cervical facet dislocation (BFD) with facet fracture (Fx) is a devastating neck injury that is rarely recreated experimentally. Neck muscle activation increases intervertebral shear and compression forces during cervical trauma, but the role of these combined loads during BFD is understudi...
Differences in ankle joint work between foot strike patterns may influence Triceps Surae (TS) muscle metabolic energy consumption and hence whole body metabolic energy consumption. Here, we used a dynamic optimization approach to estimate muscle forces, lengths and activations of 43 lower limb muscl...
The aim of this study is to quantitatively compare threedimensional (3D) shape variations in the talus and calcaneus within individuals with unilateral CAI and healthy controls. Statistical shape models (SSM) of the talus and calcaneus were built based on the mixed data of 26 patients with CAI (mean...
Ankle injuries are a frequent setback to athletes across a range of sports and identifying risk factors or groups at greater risk of injury is important in preventing such injuries. The purpose was to identify sex, leg and sport differences in ankle joint angles and moments during common athletic mo...
Sign in to ORCID