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It is uncertain whether low tibia osteotomy(LTO) with fibular osteotomy(FO) is more effective for the translation of concentrated pressure on medial malleolus than LTO without FO. This study quantitatively analyzes the peak pressure changes on the medial malleolus after LTO with and without FO using...
General methods to predict rate of recovery of Whiplash associated disorder (WAD) patients rely on subjective functional assessments. The Neck Functional Holistic Analysis Score (NFHAS) stages patients into 5 groups according to the severity of ROM loss. In a cohort of 904 patients, the NFHAS showed...
Stability is a key feature of posture plausibility in digital human models (DHM). Stepping is a behavioral mechanism to ensure the stability of the body. The aim of this study is to propose a novel stepping behavior in the presence or absence of external loads, which ensures the stability of a DHM. ...
Adjustable-height desks are promoted to reduce the detrimental effects of prolonged sitting. Musculoskeletal benefits may arise from increased postural variability, often measured as postural sway. We assessed postural sway using inertial measurement units while participants used computer workstatio...
Diminished gluteus maximus activation in persons with femoroacetabular impingement syndrome (FAIS) has been proposed to contribute to symptomatic impingement. The purpose of this pilot project was to investigate if targeted gluteus maximus activation influences transverse plane hip kinematics and ki...
We introduce effective mass as the preferred alternative to total system mass when analyzing a multi-link model of the human body. Effective mass (EM) is defined as the mass that would have equivalent motion characteristics at the point of force application if substituted for the whole system. We de...
Participants’ kinematics were collected using two motion capture systems (Xsens (inertial), Vicon (optical)) while performing a series of occupationally-relevant military-based movements. Principal component analysis (PCA) was used to detect variance within the three-dimensional marker trajectorie...
Lesser quadriceps function is moderately associated with longer periods of support during gait in individuals with obesity. Further work is needed to evaluate if increasing quadriceps function in individuals with obesity will improve temporal gait characteristics associated with postural instability...
The validity of sensorimotor balance control during walking was studied using foot placement and adjustment for foot placement during single stance. Nine stroke patients and 18 healthy controls performed a 2 minute walk test. Foot placement and adjustment for ‘incorrect’ foot placement (single s...
Here we present a mathematical model that predicts the mechanical power of outdoor cycling measured in the crank arm. We derive this model from first principles to prescribe mechanical power as a function of speed and acceleration, which are described by a combination of cadence and gear ratio. In o...
The study used the quantified assessment, feasible flexible region (Figure 1), to establish the relationship between the center of mass (COM) and base of support BOS). Eight subjects with MS were recruited. An 8-camera motion capture system (Vicon, UK) was used to collect their full-body kinematics ...
The volume of intra-muscular fluid might play an important role in the contribution of intramuscular connective tissue to muscle force development at longer muscle lengths. Additionally, prolonged running may affect intra-muscular fluid volumes by amplified blood flow or dehydration. Therefore, we a...
The transient response of postural control was investigated during quiet, eyes closed stance in young and elderly populations, as a first step in assessing the clinical relevance of this transient behavior. Time-dependent estimates of commonly used center of pressure parameters were analyzed through...
In order to study dynamic balance of stance phase during self-paced walking, variations in orthogonal ground reaction forces (GRF) were examined by using force-plate installed dual belt treadmill. As walking speed increased, standard deviations (SDs) in GRFs tended to be higher both at the beginning...
Recent work suggests that kinematics-based electrical stimulation can restore trunk stability following neuromuscular impairment. However, knowledge of the relation between body motion and muscle activity during unstable sitting may be beneficial. Our objective was to quantify the spatial and tempor...
Soft tissues throughout the human body are known to perform negative work (i.e., energy absorption) through wobbling and deforming, particularly following foot impacts with the ground (e.g., in walking). But it is not known which tissues/locations in the body are responsible for most of this soft ti...
The present study investigated the lower limb joint angle dynamics during walking and running at a range of speeds. The joint angle dynamics was assessed by the largest Lyapunov and correlation dimension. It was observed that while altered speed affected the attractor dynamics, changes in gait mode ...
The aim of this study was to investigate the effects of tDCS on CMJ performance. In the real-tDCS condition, CMJ height increased by 3.15% and 2.14% at 0min and 30 mins separately compared to pre-test. The hip joint moment in real-tDCS condition was significantly larger than that of sham-tDCS condit...
The current study aimed to develop a statistical shape model (SSM) for reconstruction of subject-specific three-dimensional (3D) knee model with multiple fluoroscopic images, and to evaluate via computer simulation its theoretical accuracy and determine the minimum number of images needed for an acc...
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...
Using a Hill-type neuromuscular model we simulate squat jumps with different additional masses under the influence of different gravitational accelerations. Applying sensitivity analysis and the idea that training will improve the performance along the gradient of a performance function, we show the...
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