An Integrated Modeling Method For Tibia Strain Analysis, 2010 Boise State University
An Integrated Modeling Method For Tibia Strain Analysis, Daniel Leib, Henry Wang
No abstract provided.
Muscular Fatigue Increases Ground Reaction Loading Rate During Walking, 2010 Ball State University
Muscular Fatigue Increases Ground Reaction Loading Rate During Walking, Henry Wang, Jeff Frame, Elicia Ozimek, Cara Reedstrom, Daniel Leib, Eric Dugan
No abstract provided.
Nebraska Biomechanics Core Facilty 2009 Annual Report, Issue 8, 2010 University of Nebraska at Omaha
Nebraska Biomechanics Core Facilty 2009 Annual Report, Issue 8, Nebraska Biomechanics Core Facility
Biomechanics Annual Report
April 2009 - March 2010
This issue features Announcements, Featured News, Projects, Collaborations, Visitors, Awards, Publications, and Support.
The Power Of Empowerment: An Icf-Based Model To Improve Self-Efficacy And Upper Extremity Function Of Survivors Of Breast Cancer, Mary Insana Fisher, Dana Howell
Physical Therapy Faculty Publications
Breast cancer is one of the most frequently diagnosed cancers among women. Breast cancer treatments often negatively impact the function of the arm, and quality of life and upper extremity function does not always return to a prediagnosis level. Survivors of breast cancer may also experience feelings of diminished self-efficacy related to functional deficits resulting from their physical limitations. The International Classification of Functioning (ICF) provides a framework for rehabilitation practitioners to address physical and psychological impairments, activity limitations, and participation restrictions. Patient outcomes may be improved by fostering self-efficacy through empowerment. This paper explores how the ICF model and ...
Anterior Cruciate Ligament Reconstruction Results In Alterations In Gait Variability, 2010 University of Ioannina
Anterior Cruciate Ligament Reconstruction Results In Alterations In Gait Variability, Constantina O. Moraiti, Nicholas Stergiou, Haris S. Vasiliadis, Eustathios Motsis, Anastasios D. Georgoulis
Introduction: The temporal structure of gait variability has shown that healthy human gait exhibits long- range correlations and deterministic properties which allow the neuromuscular system to be ﬂexible and adaptable to stresses. Pathology results in deterioration of these properties. We examined structure of gait variability after ACL reconstruction with either BPTB or quadrupled ST/G tendon autografts.
Methods: Six patients with BPTB reconstruction, six with ST/G reconstruction and six healthy controls walked on a treadmill at their self-selected pace. Two minutes of continuous kinematic data were recorded with a 6-camera optoelectronic system. The nonlinear measure of the largest Lyapunov ...
Joint Torques And Powers Are Reduced During Ambulation For Both Limbs In Patients With Unilateral Claudication, 2010 University of Nebraska at Omaha
Joint Torques And Powers Are Reduced During Ambulation For Both Limbs In Patients With Unilateral Claudication, Panagiotis Koutakis, Iraklis Pipinos, Sara A. Myers, Nicholas Stergiou, Thomas G. Lynch, Jason Johanning
Objectives: Symptomatic peripheral arterial disease (PAD) results in significant gait impairment. In an attempt to fully delineate and quantify these gait alterations, we analyzed joint kinematics, torques (rotational forces), and powers (rotational forces times angular velocity) in patients with PAD with unilateral claudication for both the affected and nonaffected legs.
Methods: Twelve patients with unilateral PAD (age, 61.69 ± 10.53 years, ankle-brachial index [ABI]: affected limb 0.59 ± 0.25; nonaffected limb 0.93 ± 0.12) and 10 healthy controls (age, 67.23 ± 12.67 years, ABI >1.0 all subjects) walked over a force platform to acquire gait ...
Nonlinear Analysis Of Ambulatory Activity Patterns In Community-Dwelling Older Adults, 2010 University of New England
Nonlinear Analysis Of Ambulatory Activity Patterns In Community-Dwelling Older Adults, James T. Cavanaugh, Naomi Kochi, Nicholas Stergiou
Background The natural ambulatory activity patterns of older adults are not well understood. User-worn monitors illuminate patterns of ambulatory activity and generate data suitable for analysis using measures derived from nonlinear dynamics.
MethodsAmbulatory activity data were collected continuously from 157 community-dwelling older adults for 2 weeks. Participants were separated post hoc into groups based on the mean number of steps per day: highly active (steps ≥ 10,000), moderately active (5,000 ≤ steps < 10,000 steps), and inactive (steps
Results All groups displayed patterns of fluctuating step count values containing complex temporal structure. DFA, ER, and ApEn parameter values increased monotonically and significantly with increasing activity ...
Development Of Lower Extremity Injury Criteria And Biomechanical Surrogate To Evaluate Military Vehicle Occupant Injury During An Explosive Blast Event, Brian J. Mckay
Wayne State University Dissertations
Anti-vehicular (AV) landmines and improvised explosive devices (IED) have accounted for more than half of the United States military hostile casualties and wounded in Operation Iraqi Freedom (OIF). The lower extremity is the predominantly injured body region following an AV mine or IED blast accounting for 26 percent of all combat injuries in OIF (Owens et al., 2007). Detonations occurring under the vehicle transmit high amplitude and short duration axial loads onto the foot-ankle-tibia region of the occupant causing injuries to the lower leg. The current effort was initiated to develop lower extremity injury criteria and biofidelic biomechanical surrogate to ...
Lyapunov Exponent And Surrogation Analysis Of Patterns Of Variability: Profiles In New Walkers With And Without Down Syndrome, 2010 University of Michigan - Ann Arbor
Lyapunov Exponent And Surrogation Analysis Of Patterns Of Variability: Profiles In New Walkers With And Without Down Syndrome, Beth A. Smith, Nicholas Stergiou, Beverly D. Ulrich
In previous studies we found that preadolescents with Down syndrome (DS) produce higher amounts of variability (Smith et al., 2007) and larger Lyapunov exponent (LyE) values (indicating more instability) during walking than their peers with typical development (TD) (Buzzi & Ulrich, 2004). Here we use nonlinear methods to examine the patterns that characterize gait variability as it emerges, in toddlers with TD and with DS, rather than after years of practice. We calculated Lyapunov exponent (LyE) values to assess stability of leg trajectories. We also tested the use of 3 algorithms for surrogation analysis to investigate mathematical periodicity of toddlers’ strides ...
Analysis Of Direct Shots At Goal From Free Kicks In Elite Women's Football, 2010 Southern Cross University
Analysis Of Direct Shots At Goal From Free Kicks In Elite Women's Football, Alison Marie Alcock
In elite football, approximately one third of all goals originate from set plays, and of those direct free kicks are the most effective for scoring goals. The purpose of this study was to determine the key attributes of successful direct free kicks in elite women's football and the mechanisms involved in expert performance of the skill. A method was developed that could reliably locate a football on a pitch within 0.24 m using television coverage and the official pitch markings, and then applied to all direct shots at goal from free kicks in the 2007 women's World ...
Electromyographic Analysis Of Trunk Muscle Activation During A Throwing Pattern Following Rotator Cuff Mobilization, 2010 Claremont McKenna College
Electromyographic Analysis Of Trunk Muscle Activation During A Throwing Pattern Following Rotator Cuff Mobilization, Aubrey L. Doede
CMC Senior Theses
Correct muscular activation of the body segments during an overhand throw is achieved when movement originates in the larger and more proximal legs and trunk and moves sequentially to the smaller, distal segments of the shoulder and arm. This sequence permits angular velocity to transfer progressively through the throw as part of an open kinetic chain. The athlete can summate angular velocity and segmental forces only if he is able to create a separation between the body segments during the movement pattern, and this separation is thus essential to effective segmental sequencing for activation of the trunk muscles to occur ...
Complexity And Human Gait, 2010 University of Nebraska at Omaha
Complexity And Human Gait, Leslie M. Decker, Fabien Cignetti, Nicholas Stergiou
Recently, the complexity of the human gait has become a topic of major interest within the field of human movement sciences. Indeed, while the complex fluctuations of the gait patterns were, for a long time, considered as resulting from random processes, the development of new techniques of analysis, so-called nonlinear techniques, has open new vistas for the understanding of such fluctuations. In particular, by connecting the notion of complexity to the one of chaos, new insights about gait adaptability, unhealthy states in gait and neural control of locomotion were provided. Through methods of evaluation of the complexity, experimental results obtained ...
Attractor Divergence As A Metric For Assessing Walking Balance, 2010 University of Nebraska Medical Center
Attractor Divergence As A Metric For Assessing Walking Balance, Max J. Kurz, Katerina Markopoulou, Nicholas Stergiou
: Individuals with Parkinson's disease and the aged have a high prevalence of falls. Since an increase in the number of falls is associated with physical and psychological harm, it is prudent that biomechanical metrics be established that will accurately assess an individual's walking balance. In this investigation, we initially used a simple bipedal walking computer model to theoretically establish the relationship between attractor divergence and walking balance. The Lyapunov exponent was used to quantify the amount of divergence present in the walking attractor. Simulations from our model indicated that attractors that have a greater amount of divergence are ...
Variability Of Lower Extremity Joint Kinematics During Backward Walking In A Virtual Environment, 2010 University of Nebraska at Omaha
Variability Of Lower Extremity Joint Kinematics During Backward Walking In A Virtual Environment, Dimitrios Kastavelis, Mukul Mukherjee, Leslie M. Decker, Nicholas Stergiou
Backward walking (BW) shows significant differences with forward walking (FW) and these differences are potentially useful in rehabilitation. However the lack of visual cues makes BW risky. The purpose of this study was to investigate the effect of visual cues provided by a virtual environment on FW and BW on gait variability. Each subject underwent four conditions of treadmill walking at self-selected pace. The subjects walked backwards in three conditions and forwards in the fourth condition. A virtual corridor was displayed to the subjects in the FW condition (forward optic flow) and two of the backward conditions (forward and backward ...
The Impact Of Environmental Noise On Robot-Assisted Laparoscopic Surgical Performance, 2010 University of Nebraska Medical Center
The Impact Of Environmental Noise On Robot-Assisted Laparoscopic Surgical Performance, Ka-Chun Siu, I. H. Suh, Mukul Mukherjee, D. Oleynikov, Nicholas Stergiou
Background. An operating room is a noisy environment. How noise affects performance during robotic surgery remains unknown. We investigated whether noise during training with the da Vinci surgical robot (Intuitive Surgical, Inc., Sunnyvale, CA) would affect the performance of simple operative tasks by the surgeon.
Methods. Twelve medical students performed 3 inanimate operative tasks (bimanual carrying, suture tying, and mesh alignment) on the da Vinci Surgical System with or without the presence of noise. Prerecorded noise from an actual operating room was used. The kinematics of the robotic surgical instrument tips and the muscle activation patterns of the subjects were ...