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The coordination and control of rhythmic, continuous movements are constrained by metabolic energy demands, but it is not known if coordination patterns during discrete, goal-directed tasks such as maximal-height vertical jumping are constrained by energetics. Accordingly, the purpose of this study ...
Individuals encounter obstacles while walking through their environment on a regular basis, correct navigation of which requires correct visual perception of the obstacle and an appropriate biomechanical crossing strategy. In a physically fatigued state, environmental navigation can potentially pose...
We propose and evaluate a method for measuring energy exchange between a transtibial prosthesis and the residual limb using only wearable sensors. We reconstruct leg movement from inertial sensors on the foot and shank, and incorporate force and moment from a pylon load cell to compute energy storag...
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...
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. ...
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...
This study tested a novel upper limb weight support device with a participant living with stroke. Outcome measures were feasibility of the device with the user and movement with and without the device.
The purpose of this study was to quantitatively measure the strain induced upon the bone by an electrically induced contraction of the muscles in order to analyse the potential of using Functional Electrical Stimulation (FES) as a method for targeted osetogenesis. With the force output of a joint du...
Mounting evidence reveals deficits in dynamic gait balance control persist in individuals with acute mild traumatic brain injury (mTBI) when assessed with sensitive whole body center of mass (COM) kinematics and a dual-task (DT) paradigm [1]. In this preliminary study eight veterans with symptoms of...
This work presents the kinematics and dynamics results from a motion capture study that collected head and helmet motions of 12 subjects. The (translational and rotational) motions of the helmet relative to the head were obtained from the inverse kinematics analyses. Inverse dynamics analyses were p...
This study investigated whether the human gait cycle spontaneously entrains to rhythmic electrical stimulation of the gastrocnemius muscle with phasing that aligns the stimuli with ankle push-off. Rhythmic stimulation was applied at the natural stride frequency, with random initial phasing. Some, bu...
A five-segment musculoskeletal model of the foot was used to estimate peak strains of the spring, deltoid, long plantar, short plantar, bifurcate, and cervical ligaments during two walking speeds. Significantly greater peak strains were found in the 3rd and 4th slips of the long plantar ligament, sh...
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...
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 ...
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...
Controllability of posture in the medial-lateral direction is determined as a critical capacity for balance maintenance in step initiation. Eleven young healthy participants stood on the force platform and instructed to take a step while experiencing a pendulum perturbation from the lateral side of ...
A fibril-reinforced poroviscoelastic material model was introduced to model anterior cruciate ligament stress-relaxation behaviour in tension. The proposed model with an exponential fibril formulation was able to capture the stress-relaxation response at physiological strain levels. It provides insi...
In this work we present a control algorithm for restoring movements in paralyzed limbs through functional neuromuscular stimulation (FNS). We employed a nonlinear model predictive controller (NMPC) in conjunction with an Extended Kalman Filter (EKF). Both the NMPC and EKF were equipped with a neurom...
Is it your mind or your hand that grasps an idea? Neural and behavioural evidence from the cognitive sciences suggests it may be both due to a theorized bidirectional relationship between cognitive processes and motor control. Yet, this hypothesis has not been approached from a neuromechanical persp...
Virtual reality (VR) is currently increasing in popularity as a medium for motor skill training, particularly in the areas of occupational skills and motor rehabilitation. However, there is still debate as to how well motor skills learned in a virtual environment transfer to the real world due to pe...
This study reports the effects of mechanical environment on the modulation of ankle impedance during the stance phase of walking. We used a robotic platform, capable of simulating different mechanical environments and providing accurate perturbations, to investigate how ankle impedance vary during w...
In this study, we proposed implement method between SLIP model that explains the walking dynamics well and a neural network (NN). The proposed method has two major steps. First is biomechanical model step, and second is NN process step. STEP 1. From CLM, estimate two direction of GRFs (F_v,F_ap) fro...
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...
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...
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...
Walking at high speeds for longer periods feels uncomfortable and is fatiguing. This study compares ankle flexor and extensor strength prior to and following 35 or 47 min fast walking. Following the walking period, isometric maximal ankle dorsiflexor and plantarflexor strength was reduced with 25% a...
Chemotherapy treatment of cancers by paclitaxel often results in peripheral neuropathy which is the main reason for patients to withdraw from the therapy. The function of a peripheral nerve depends highly on biomechanical properties of its tissues and cells. The goal of this study is to investigate ...
The normative description of sit-to-stand (STS) enables biomechanists to objectively analyze this motion and to compare healthy and pathological patterns of movement against a common definition. When the participants in our study performed STS, they demonstrated the phases of STS but their timing di...
Current clinical criteria for identifying bone cancer patients at high risk of fracture are not solid and comprehensive, which in many occasions result in unnecessary prophylactic stabilization. The goal of this study was to develop a validated biomechanical tool to assess bone strength, as the key ...
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