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Twenty-one CPR-certified participants performed six-minutes of CPR on a training manikin in four positions. Electromyography (EMG) of nine muscles, kinematics of the training manikin, and kinetic data at the hands of the rescuer were collected. There was no difference in the rate of decrease of ches...
Metabolic cost of transport (MCoT) of gait was estimated from marker data and ground reaction forces (GRFs). Sagittal plane joint angles and joint moments were determined using inverse kinematics and dynamics, respectively, and muscle states were determined by dynamic optimization. Metabolic cost of...
The objective of our study is to develop an XFEM model of cancellous bone specimen in 3D that is capable of accurately predicting the onset and propagation of cracks under mechanical loading. In order to do so, the micro-CT scan data of cancellous bone was converted into 3D geometry. Material proper...
We applied a PCA-based technique to extract functional movement components and the corresponding activity of the neuromuscular controller from kinematics data in people with DS. Specific abnormalities were found in frontal-plane control.
Femoroacetabular impingement (FAI) syndrome has been related to joint and muscle adaptations. Three different FAI patient age groups had their range of motion (ROM), strength and functionality compared. Although hip ROM and functionality were similar between groups, muscle strength was smaller for e...
The rate of oxygen uptake (V̇O2) has been used to infer changes in metabolic rate with changes in EMG; however, V̇O2 is simply a proxy for the energy cost (EC) of exercise since the former does not account for substrate use. We compared the EMG/V̇O2 to the EMG/EC across different power outputs an...
The impact of spasticity on walking is currently unclear. Assessments of spasticity require the assessor to move a limb as fast as possible, with potential discrepancies in testing velocity and range of motion between clinicians, as well as between what is observed during functional activities such ...
Plenty of patients with anterior cruciate ligament reconstruction (ACLR) had a second injury of the anterior cruciate ligament (ACL), due sensorimotor deficits that remain after the discharge of the patient. The purpose of this study was to determine the differences in knee kinematic and postural sw...
Age-related decline of the physiological functioning of the sensorimotor system negatively affects balance control. According to the hypothesis of reduced complexity with ageing and disease, lower functional complexity of the control system would induce center-of-pressure motion (CoP) of balance tha...
Pubic symphysis width is measured using 3D freehand ultrasound in different birthing positions: supine, lithotomy position, standing and squatting. The relative position of the pubic bones would also be analysed. Preliminary results show that the motion at pubic symphysis in different positions incl...
Reaching overhead is a challenging task, especially for older adults, specifically because many people adopt unstable stances that lead to falls. This study investigates the effect of 3 factors on postural stability during an overhead forward reaching task: footwear, stance, and foot contact. Result...
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...
Functional data analysis (FDA) provides a powerful alternative to traditional digital filtering for analysing time-series data. In this study, FDA applied to repeated throwing trials facilitates comparison of curve shapes and key features.
We proposed a ground reaction force (GRF) estimation method from the input of RGB video capturing human walking. To convert kinematic motion data from a video into kinetic GRF data, we used a spring-loaded inverted pendulum (SLIP) model that reflects the relationship between the center of mass (CoM)...
Measuring landing kinetics during the single hop test provides valuable injury risk information and is clinically feasible. This study compares landing kinetics during a single hop between females with and without an anterior cruciate ligament reconstruction (ACLR). ACLR patients had shorter hop dis...
The ability to change heading direction while walking is an important component of everyday mobility. During turning the movement of the body’s centre of mass must be redirected towards the new walking direction. The aim of this study is to experimentally test the proposition that turning is contr...
Novice runners are more prone to knee injury than experienced runners. Knee injuries are related to frontal and transverse plane running kinematics. However, the kinematic differences between experienced runners and new runners have not been completely described. We compared frontal and transverse p...
Many methods are used to quantify knee valgus angle (KVA). However, not all angles used to calculate KVA are equivalent. Four methods of calculating KVA were used on twenty-three athletes during a drop jump using a 10-camera motion capture system. The results showed that using a global reference fra...
Acute knee injuries are the most prominent of all severe sporting injuries, whereby neuromuscular deficits and aberrant knee mechanics during landing are well documented as contributing factors [1,2,3]. Participants with greater proprioceptive acuity were found to land with decreased knee flexion at...
Deformability of the foot and thicknesses of lower extremity muscles were measured and kinetic/kinematic analyses of normal shod walking were done on children and adults. Children showed higher relative navicular drop and smaller peroneus longus muscle thickness, and characteristic features in the g...
Three-dimensional (3D) finite element (FE) models using subject-specific kinematics during a single-leg landing task were created for a person with patellar tendinopathy (PT) and a healthy control. Maximum principal stress (MPS) in the patellar tendon was the primary dependent variable of interest. ...
Predictive simulations hold the potential to greatly expedite advances in understanding healthy and pathological movement. We developed a computationally efficient framework to predict human movement based on optimization of a performance criterion. The framework generates three-dimensional muscle-d...
After lateral lengthening of the calcaneus patients have different gait patterns during uphill walking compared to healthy subjects. Push-off phase was particularly altered with a more extended knee joint than healthy subjects and a lower ground reaction force compared to the contralateral leg.
Bone healing and (re)modelling depends on the interaction of mechanical loading with molecular processes. Multimodal imaging technology is needed to better understand these interactions, which could play a key role in novel treatments and therapies. We have developed an improved local in vivo enviro...
Muscle-based simulations have predicted the metabolic cost of locomotion with varying success. We investigated if independent recruitment of motor units within a muscle could reduce the predicted cost. We predicted metabolic cost using experimental data of walking and simulations that consisted of i...
Using standardised kinematic inputs and implant alignments can limit the scope of experimental wear testing for total joint replacement. Introducing patient and population inputs, from biomechanical, clinical and retrieval studies, can enhance the predictive power of pre-clinical testing for evaluat...
While several types of kinematics have been used to assess unstable sitting control, their contribution to the completion of this task is unknown. The overall goal of this study was to understand the kinematics used to stabilize the trunk in unstable sitting as elicited via a wobble board (WB). The ...
The performance of the computers “central processing units” (CPUs), “graphics processing units” (GPUs) and of the “inertial measurement unit” (IMUs) is constantly evolving. In this paper, we apply IMUs data to an avatar in a game “integrated development environment” (IDE) to stimulat...
Previous studies suggest that the maximum weight for overweight children’s backpacks should be less than 10% of their body weight (BW). In this study we aim to analyse the postural adaptations for obese/overweight and healthy-weight students while carrying a backpack or a school trolley with varyi...
Different adaptation rates have been reported in studies involving ankle exoskeletons designed to reduce the metabolic cost of their wearers. The purpose of this study was to characterize energetic adaptations occurring over multiple training sessions in a novel exosuit assisting the hip joint. The ...
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