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When faced with changes in surface stiffness, humans opt to preserve efficient movement dynamics by altering the spring-like mechanics of their legs, maintaining an invariant series stiffness of leg and surface. Here we examined the contribution of the foot to this mechanism.
Patients who have repaired their Achilles tendon (AT) rupture have potentially high risk for re-rupture. The present study showed that the great strain of the rupture-experienced AT during hopping can be one of crucial risk factors for re-rupture. In addition, the preprogramed muscle activation may ...
Neuromuscular electrical stimulation (NMES) is generally delivered to superficial skeletal muscles in static conditions (without functional movement occurring) and at sufficiently high current intensities to evoke visible contractions, with the goals to substitute/complement voluntary exercise (clin...
The dynamics of the plantarflexor muscles introduce a considerable delay in the postural control system of standing, destabilizing standing balance. Such dynamics had to be considered when developing a closed-loop controller for standing balance using functional electrical stimulation (FES). This pr...
The study consisted of examining coxo-femoral joint kinematics, in-silico muscle force contributions and hip contact forces during level walking and squatting in femoroacetabular impingement syndrome (FAIS). Eleven symptomatic FAIS patients, and 11 healthy participants gave written consent to partic...
Neuromuscular disorders e.g. spinal muscular atrophy (SMA) and stroke have a negative impact on functional movement capability. These disorders affect lower and upper motor neurons respectively. In this study high spatial resolution EMG (HSR-EMG) was used to record single motor unit (MU) activity in...
This study aimed to verify which normalization procedure (mass or non-dimensional normalization) better eliminates the influence of body parameters on joint moments during stair ascent in the elderly. None of the tested methods was able to consistently remove the influence of body parameters on join...
We sought to extend recent research that explored model-based approaches for combining clinical and gait measures (e.g., mobility, balance, strength, postural sway, difference scores between dual- and-single-task gait conditions) to determine the most sensitive grouping for retrospectively classifyi...
T2 MRI relaxation times of the ankle tibiotalar cartilage, plantar pressure and finite element predicted von Mises cartilage stress were evaluated in 10 novice and 10 marathon experienced (ME) runners who ran barefoot for 5km. After running, ME runners decreased tibiotalar cartilage stress and maint...
Regular papers should present novel perspectives within the general scope of the conference. Short papers (Work-in-Progress) are an opportunity to present preliminary or interim results. Posters are intended for ongoing research projects, concrete realizations, or industrial applications/projects pr...
Achilles tendinopathy is a well-known pathology that can vary in both chronicity and symptom presentation. Pain, although often being used as an indicator of the severity of the pathology, is not always present and symptoms fluctuate throughout the stages of pathology. Advanced tendinosis accompanie...
Commercially available lower-limb prostheses do not provide sensory feedback. Thus, amputees develop compensatory mechanisms to regain an effective postural control. In this work, we investigated the neuromuscular adaptations occurring after a lower-limb amputation. The dynamics and spatial structur...
The effects of typical mountain ultramarathon races (100 miles, i.e. 170 km) on neuromuscular fatigue have been well described. This study aimed to compare neuromuscular fatigue and recovery between two 170 km races i) in one single stage, and ii) when splitting the course in four equal stages of 42...
We investigated whether surface-detected motor unit action potential (MUAP) shapes can be used to identify alterations in muscle control that occur in neuropathy and that are typically assessed using invasive needle electromyography (EMG). We found that a novel, non-invasive MUAP extraction techniqu...
Residual force enhancement (rFE) is an established feature of skeletal muscle, but its molecular mechanism remains a matter of debate. In this study, rFE was elicited by stimulation protocols that simulated muscle fiber recruitment versus rate coding conditions. The results indicate that rFE was lar...
Chest and abdominal wall movements have important implications for monitoring patient routines. In this regard, the use of wearable technologies combined with data analysis can be a low cost and effective option to achieve this end. Here we set out to determine the feasibility of using accelerometry...
Comprehensive documentation of lower extremity muscle forces and patterns in gait is still lacking in literature. Such information may provide valuable baseline data for applications in rehabilitation, exercise, and robotics. Therefore, the purpose of this study was to determine muscle forces and pa...
Computational mechanobiological models can help to understand mechanisms leading to the progression of osteoarthritis following a joint injury. Here, we present recent advancements of in vitro and in vivo computational mechanobiological modeling of cartilage for this purpose.
Optoelectronic plethysmography (OEP) is a 3D motion capture technique that provides information on an individual’s breathing pattern by measuring the movement of the chest wall. The purpose of this study was to determine if OEP derived breathing parameters could distinguish between rest, various e...
Mouth protectors (i.e. mouthguards) are devices that are used in many sports in an effort to protect orofacial anatomy, in particular teeth, from injury, including impact-induced injury. There is limited biomechanical literature examining the mechanics of these impact-induced injuries. This prelimin...
In human locomotion, lower extremity stiffness (KLeg) describes how subjects attenuate load during ground contact. Greater KLeg is associated with increased risk for lower extremity injury. We analysed the neuromechanical contributions to KLeg during running and single leg hopping in healthy runners...
Haemophilic arthropathy is the result of repetitive intraarticular bleeding and synovial inflammation. The effects of haemophilic arthropathy on neuromuscular control during gait have not been investigated. We compared muscle activity patterns and lower limb kinematics between people with haemophili...
A biomechanical evaluation was completed to assess and help better understand the human-factor outcomes of sitting in an active office chair.
The purpose of the study was to develop and examine a new functional skill test with an upper extremity prosthesis, involving fundamental upper limb motor functions such as reaching, grasping, carrying, placing, releasing, and retrieving an object. The test scores (total time, accuracy, and efficien...
This study tests the feasibility of a cost-effective concept for measuring plantar pressure in people with diabetic foot during activities of daily living. A 3D-printable cushioning material with complex mechanical behaviour was produced and tested. The results indicated that mapping the changes in ...
Normalized jerk is an established metric for the assessment of kinematic fluency across a range of human movements (e.g. writing, manual aiming, balance, and gait) [1-3]. While normalized jerk has been employed to evaluate manual disfluencies in Parkinson disease (PD) patients over extended trials, ...
One of the main limitation of CT imaging and especially Dynamic CT acquisitions of the lower limb is the unavailability of devices that create weight-bearing (WB). This study aimed to validate a novel device developed for this proposes. 15 healthy subjects performed a series of orthostatic squats, f...
Estimation of spring-mass parameters in running (i.e., leg stiffness) relies on geometric assumptions of a runner’s anthropometry and dynamics. A method is presented that estimates leg stiffness, touchdown angle, and leg length from a vertical ground reaction force recording using nonlinear regres...
We developed an automatic design programme to manufacture customized ankle-foot orthoses (AFOs). This kind of customized AFOs were much suitable for patients, because they prevent rubbing against foot and orthosis. First, we used a 3D scanner to obtain the foot 3D model, and then entered the data in...
Critical to the advancement of bionic technology that emulates or extends normal physiological function is the design of tissue-synthetic interfaces connecting the human body with electromechanics. In this talk, I describe research activities underway to advance mechanical and electrical interfaces ...
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