THE THIRD ANNUAL CONFERENCE IN HUMAN MOVEMENT VARIABILITY

THE CENTER FOR RESEARCH IN HUMAN MOVEMENT VARIABILITY

UNIVERSIT Y OF NEBR ASK A AT OMAHA

FILE NAME 0572-PRGM_COE_MVMT_VAR_CONF_D6 DRAFT 6

DESIGNER ANGELICA GENOVESI DATE April 30, 2018 3:55 PM

ROUTING GD _____ CD _____ CW _____ PM _____ DM _____ DIGI _____

2 3THIRD ANNUAL CONFERENCE IN MOVEMENT VARIABILITY

MESSAGE FROM THE DIRECTOR

DEAR PARTICIPANTS AND GUESTS,

Welcome to the Third Annual Conference in Human Movement Variability! I would like to thank our speakers for traveling to Omaha to share their expertise in human movement variability.

The “Biomaha Field of Dreams”, where we always rethink the impossible since nothing seems truly impossible any more, is unfolding before your eyes. As we enter the fifth year of our COBRE, I am delighted to announce the building’s 30,000 sq. ft. expansion. The expansion is scheduled to be completed by September 2019 and will help continue our trajectory of changing the research culture at UNO. Expanding our physical footprint at UNO will help us expand our scientific research footprint across the globe.

Please enjoy the knowledge shared today and everyone’s hard work. Be sure to visit the MOVCENTR’s website at cobre.unomaha.edu to stay up to date on our progress, upcoming events and Seminar Series. Best, Nick Stergiou, Ph.D.

Assistant Dean of the Division of Biomechanics and Research

Development, College of Education, University of Nebraska at Omaha

Distinguished Community Research Chair and Professor, Department

of Biomechanics, University of Nebraska at Omaha

Director, Biomechanics Research Building and Center for Research in

Human Movement Variability, University of Nebraska at Omaha

Professor, Department of Environmental Agricultural and Occupational

Health, College of Public Health, University of Nebraska Medical Center

AGENDA

7:50 A.M. | CENTER ROOM WELCOME

Nick Stergiou, Ph.D. Assistant Dean of the Division of Biomechanics and Research

Development, Director of the Center for Research in Human

Movement Variability, University of Nebraska at Omaha

8:00 A.M. | CENTER ROOM GUEST SPEAKER

Janet Dufek, Ph.D, FACSM School of Allied Health Sciences, Department of Kinesiology

and Nutrition Sciences, University of Nevada, Las Vegas

8:40 A.M. | CENTER ROOM BARRY T. BATES KEYNOTE SPEAKER

Jeffrey Hausdorff, Ph.D. Director, Center for the Study of Movement, Cognition, and Mobility

Tel Aviv Sourasky Medical Center; Professor, Department of

Physical Therapy, Sackler Faculty of Medicine, and Sagol School of

NeuroscienceTel Aviv University; Professor, Rush Alzheimer’s Disease

Center and Department of Orthopaedic Surgery at Rush University

9:55 A.M. | WEST ROOM POSTER SESSION A/NETWORKING/VENDORS

Poster Numbers 101-122

10:55 A.M. | CENTER ROOM GUEST SPEAKER

Evangelos Christou, Ph.D. Department of Applied Physiology & Kinesiology, University of Florida

11:35 A.M. | CENTER ROOM GUEST SPEAKER

Jesse Dean, Ph.D. Division of Physical Therapy, Medical University of South Carolina

12:15 P.M. | CENTER ROOM LUNCH/NETWORKING

Boxed lunches will be served

1:30 P.M. | CENTER ROOM HONORARY BARRY T. BATES KEYNOTE SPEAKER

Karl Newell, Ph.D. Department of Kinesiology, University of Georgia

2:30 P.M. | WEST ROOM POSTER SESSION B/NETWORKING/VENDORS

Poster Numbers 201-223

3:15 P.M. | CENTER ROOM ORAL PRESENTATIONS

4:30 P.M. | CENTER ROOM WRAP-UP/AWARDS

4 5THIRD ANNUAL CONFERENCE IN MOVEMENT VARIABILITY

JEFFREY HAUSDORFF, PH.D. TEL-AVIV SOURASKY MEDICAL CENTER BARRY T. BATES KEYNOTE SPEAKER

Unraveling the Layers of Gait Variability in Aging and Neurodegeneration: Pearls and Precautions

A B S T R A C T: Average gait speed is a powerful predictor of many clinical outcomes. Nonetheless, important information and insights into motor control can be gleaned by studying the stride-to-stride fluctuations of the gait pattern. This presentation will summarize early work using footswitches to evaluate gait variability in healthy aging and in patients with neurodegenerative disease. We will describe the so-called continuous and episodic gait disturbances that are common among patients with Parkinson’s disease and the related changes in gait variability, focusing on the perplexing and debilitating phenomenon known as freezing of gait. We will also show how gait variability provides understanding into the cognitive control of walking and fall risk, highlighting the role of the dorsal lateral pre-frontal cortex, and demonstrate how body-fixed sensors and 24/7 continuous monitoring can be used to provide sensitive measures and quantify gait dynamics, potentially serving as a bio-marker of Parkinson’s disease and cognitive decline. Finally, we will illustrate how gait dynamics respond to therapeutic interventions and steps that should be taking when considering the multiple aspects of gait variability metrics.

B I O : Professor Jeffrey M. Hausdorff (B.S.E, M.S.M.E, Ph.D.) completed his undergraduate degree in engineering at The Cooper Union, graduate degrees at MIT and Boston University, and post-doctoral training at Harvard Medical School. Currently, he directs the Center for the Study of Movement, Cognition, and Mobility at the Tel Aviv Sourasky Medical Center. He is also an associate editor for the Journal of Gerontology Medical Sciences and the Journal of NeuroEngineering and Rehabilitation. Building on his background in biomechanics, biomedical engineering and gerontology, he and his lab have lead pioneering studies on gait variability and the inter-relationships between cognitive function and gait in normal aging and neurodegeneration.

KEYNOTE SPEAKER HONORARY KEYNOTE SPEAKERKARL M. NEWELL, PH.D. UNIVERSITY OF GEORGIA HONORARY BARRY T. BATES KEYNOTE SPEAKER

The Acquisition of Coordination in Movement Skills

A B S T R A C T: In this talk, I will elaborate on the perspective of Nikolai Bernstein (1967) that skill in movement tasks is, in effect, the mastery of the redundant degrees of freedom (DFs). The study of motor learning and performance has, however, been dominated by task demands to scale an already producible coordination mode - thus restricting the coordination of the joint space DFs in many laboratory motor learning tasks. The acquisition of new patterns of coordination in whole-body sport motor skills, in contrast, gives emphasis to the coordination and control of multiple joint DFs and the motion and stability of the torso in every activity. It remains a challenge in the theory and practice of movement science to understand the roles of the many DFs in the formation and acquisition of movement coordination, control and skill over the lifespan.

B I O : Karl Newell, Ph.D. was born and raised in Brighton, England. He completed undergraduate studies at the former Loughborough College of Education and graduate degrees in Physical Education at the University of Illinois at Urbana-Champaign (UIUC).He was Professor and Head of Kinesiology at UIUC and then Professor and the Marie Underhill Noll Chair in the Department of Kinesiology at The Pennsylvania State University, USA. He is now professor of Kinesiology at the University of Georgia. His research focuses on the coordination, control and skill of normal and abnormal human movement across the lifespan. One emphasis is the information for and dynamics of change in motor learning and development. The other major research theme is the study of variability in human movement and posture. He has over 400 publications in a range of journal articles, book chapters and books and essentially a career of external funding from primarily NIH and NSF.

6 7THIRD ANNUAL CONFERENCE IN MOVEMENT VARIABILITY

JANET DUFEK, PH.D. UNIVERSITY OF NEVADA, LAS VEGAS GUEST SPEAKER

See How (S)he Lands: Modeling to Performance Strategies

A B S T R A C T: The task of landing from an airborne activity is accomplished by controlling and arresting the mechanical energy possessed by the system in a safe and efficient manner. In many cases, the intent is to manipulate the body in such a way that the vertical velocity of the system center of mass is reduced to zero. In other cases, if ground contact is not the intended terminal movement outcome (such as in a triple jump), the purpose is to control the system center of mass velocity and re-direct it in the desired direction of subsequent motion. In either case, landing is often viewed as a simple task that is performed similarly by all. Our initial investigations into landing performance suggested this is not the case. We initially examined effects of mechanical energy on ground reaction forces by way of height and horizontal landing distance manipulations. We modeled these landings, using kinematic parameters, to predict force outcomes. By way of several experiments that followed, we learned that individuals use unique strategies to produce desired movement outcomes. In this presentation, we will examine the evolution of techniques developed to both model landings and identify movement strategies. Variability in performance will be addresses in the definition and execution of the developed landing strategy models. An eye toward injury potential and injury prevention will also be weaved into this presentation.

B I O : Janet Dufek, Ph.D. received a B.S. in Physical Education and Health Education along with accredited K-12 teaching certifications from the University of Wisconsin-Superior. She obtained a Master’s Degree in Scientific Foundations of Kinesiology from Illinois State University, and a Ph.D. in Biomechanics from the University of Oregon. She is presently Associate Dean in the School of Allied Health Sciences and Professor in the Department of Kinesiology and Nutrition Sciences at the University of Nevada, Las Vegas. Dufek is also Graduate Coordinator for the Ph.D. programs in Kinesiology and Interdisciplinary Health Sciences, and is a Graduate Faculty Fellow in UNLV’s Graduate College. She also holds Associate Graduate Faculty Status in the Department of Mechanical Engineering at UNLV and is an Adjunct Professor in UNLV’s School of Medicine and at the University of Nebraska at Omaha.

EVANGELOS CHRISTOU, PH.D. UNIVERSITY OF FLORIDA GUEST SPEAKER

The Functional Significance of Motor Output Variability

A B S T R A C T: Motor output variability is defined as the unintentional variations in the output of voluntary contractions. In the first part of this presentation, I will introduce the possible sources of motor output variability and focus on motor unit discharge rate variability and modulation of the motor unit pool. In the second part, I will provide functional implications of the age-related increase in motor output variability. Specifically, I will provide evidence that increased motor output variability in older adults impairs their ability to learn new motor tasks and impairs their ability to react fast in laboratory and simulated functional tasks, such as driving.

B I O : Evangelos A Christou, Ph.D. is currently a Professor in the Department of Applied Physiology and Kinesiology at the University of Florida. Christou directs the Neuromuscular Physiology Laboratory at UF and teaches courses on neuromuscular control and learning. Christou’s research, focuses on the following basic questions: 1) What are the neural mechanisms that exacerbate motor output variability? 2) What are the functional implications of exacerbated motor output variability? 3) How can we reduce motor output variability and enhance function? Christou’s research has been funded from the National Institute of Health since 2004. He is currently an associate editor for Frontiers in Physiology, on the Editorial Board of the European Journal of Applied Physiology and Journal of Motor Behavior, and an ad-hoc reviewer for over 20 journals.

JESSE DEAN, PH.D. MEDICAL UNIVERSITY OF SOUTH CAROLINA GUEST SPEAKER

The Problem of Gait Instability: Can a Biomechanics-based Approach Provide Unique Insight?

A B S T R A C T: Human walking is inherently unstable, requiring active control to avoid losses of balance – particularly in the frontal plane. Neurologically intact adults address this problem in part through step-by-step variation in step width. Importantly, this variation is not random noise, but is largely predicted by the mechanical state of the body’s center of mass. Unfortunately, this step-by-step stabilization strategy is disrupted in many chronic stroke survivors. These individuals instead tend to place their paretic leg quite far laterally, independent of the body’s mechanical state. Recent evidence indicates that disruption of this stabilization strategy predicts an increased fall risk. We have developed a force-field able to influence step width in real-time. This device has shown promise for both assisting and perturbing the mechanics-dependent control of step width. Ongoing work is testing the potential of using this device as a training tool among stroke survivors at a high risk for falls.

B I O : Jesse Dean, Ph.D. is an Associate Professor in the Division of Physical Therapy at the Medical University of South Carolina, with a research agenda investigating the improvement of functional mobility among individuals with neurological injuries. His current research is primarily focused on post-stroke deficits in gait stability, ranging from the identification of underlying mechanisms to the development of potential therapeutic interventions. Dean’s work in these areas is based on the combination of his doctoral education in Biomedical Engineering from the University of Michigan, and his post-doctoral work at the Centre for Neuroscience at the University of Alberta.

GUEST SPEAKERS

8 9THIRD ANNUAL CONFERENCE IN MOVEMENT VARIABILITY

POSTER SESSION A

AUTHOR POSTER # JOB/STUDENT TITLE PRESENTATION TITLE

Joao R. Vaz 101 Research Associate Altered Gait Variability Does Not Affect Heart Rate Dynamics in Young Adults

Heather Porter 102Senior Audiology

Research AssociateA New Method to Test Hearing in Children with Motor or Developmental Impairment

Tatsunori Watanabe 103 Physical TherapistForward Postural Lean Modulates Common Neural Input

to Unilateral and Bilateral Plantar Flexor Muscles

Jordan Wickstrom 104 Instructor Standing Posture is Reliable Across Days and Weeks in Healthy, Young Adults

Erica A. Hedrick 105 Graduate Research AssistantHow Prosthetic Ankle Stiffness & Load Carriage Affect

Metabolic Energy Expenditure During Walking

Prokopios Antonellis 106 Doctoral Research Assistant Effects of Timing and Magnitude of Waist Pulling Assistance on Metabolic Cost and Joint Mechanics

Keaton Young 107 Graduate Research AssistantTechnical, Clinical and Functional Considerations for the

Development of 3D Printed Upper-Limb Prostheses

Mason Schleu 108 Graduate Research Assistant Non-Linear Analyses for Assessing Static and Dynamic Variability Using Smartphone Sensor Data

Angel E. Gonzalez 109 Graduate Research Assistant Effects of Foot Temperature Increase on Skin Sensitivity and Balance

AUTHOR POSTER # JOB/STUDENT TITLE PRESENTATION TITLE

Nick Jaton 110 Student Research Assistant Protoyping and Fabrication of a Variable Surface Treadmill

Jeffrey Patterson 111 Doctoral Research Assistant The Effects of Added Body Mass on Foot Mechanics and Thermoregulation

Anthony Arellano 112 Student Research AssistantSupervised Walking Exercise Therapy Imporves Gait

Biomechanics in Patients with Peripheral Artery Disease

Katlyn J. Nimtz 113 Graduate Research Assistant The Relationship Between Linear and Nonlinear Analysis on Activity Data

Takashi Sado 114 Graduate Research AssistantPassive Exoskeleton Enhanced Temporal Component

of Gait Adaptation in a Split-Belt Adaptation Task

Arash M. Gonabadi 115 Doctoral Research Assistant Developing a Footswitch Device to Assess the Likelihood of Falls in At-Risk Populations

Philippe Malcolm 116 Assistant ProfessorSimulated Evaluation of Human-in-the-Loop Exoskeleton Optimization

to Reduce Gait Variability in Patients with Peripheral Artery Disease

Todd Leutzinger 117 Graduate Research AssistantIndividuals with Peripheral Artery Disease Alter Spatiotemporal

Gait Parameters when Walking with Pain Versus without Pain

Tyler Hamer 118 Graduate Research Assistant Examining the Minute to Minute Predictability of Walking Distance Across Multiple Terrains

Aaron Robinson 119 Student Research Assistant The Effects of Vibrations on the Light Touch Perception Threshold of Transtibial Amputees

Blake Beier 120 Graduate Research Assistant The Astro Xo Exoskeleton Alters Ankle Kinetics in Healthy Individuals

Henamaria Ybay 121 Student Research Assistant Measurement of Muscle Oxygen Saturation of the Gastrocnemius of Healthy Controls

TeSean Wooden 122 Student Research Assistant Software-Based Training to Enhance Student Learning in Biomechanics

PRESENTER JOB/TITLE AFFILIATION PRESENTATION TITLE

Mr. Abderrahman Ouattas Graduate Research Assistant Biomechanics, UNO Knee Proprioception Impairments Post Total Knee Arthroplasty

Mr. James Pierce Graduate Research Assistant Biomechanics, UNOCoordination and Brain Activity Correlates

of Upper-Limb Prosthesis Use

Dr. Adam B. Rosen Assistant Professor Athletic Training, UNOSample Entropy Differences in Static Postural Control

in Individuals with Chronic Ankle Instability

Dr. Andreas Skiadopoulos Research Associate Biomechanics, UNO A Novel Task to Decrease Step Width Variability in Older Adults

ORAL PRESENTATIONS

10 11THIRD ANNUAL CONFERENCE IN MOVEMENT VARIABILITY

POSTER SESSION B

AUTHOR POSTER # JOB/STUDENT TITLE PRESENTATION TITLE

Andrew M. Kern 201 Research Associate Walking with Added Mass Influences Ankle and Mid-Tarsal Joint Quasi-Stiffness

Jessica Fujan-Hansen 202 Doctoral Research Assistant The Addition of Optic Flow Lessens Age Related Differences During Gait Adaptation

Douglas A. Rowen 203 Graduate Research Assistant Fractal Scaling of Visual Metronomes Affects Cortical Hemodynamics

Emma Leone 204 Graduate Research Assistant Imitation of Copd Breathing in Healthy, Young Individuals

Zachary Motz 205 Doctoral Research Assistant Inter-Limb Coordination in Chronic Stroke Survivors

Kyle Brozek 206 Student Research Assistant Design Improvements on a Wearable Apparatus for Slip Perturbations

David Salazar 207 Graduate Research Assistant Development of Low Cost 3D Printed Anatomical Models for Pre-Surgical Planning

Dillon Anderson 208 Doctoral Student Effect of Limb Dominance on Limb Symmetry Index in Strength and Jumping Measures

Eric Knight 209 Doctoral Student The Effect of Fatigue on Jumping Performance and Biomechanics

Christos Ziliaskoudis 210 Graduate Research Assistant Does Vibration Improve Balance in Lower-Limb Amputees?

Farahnaz Fallah Tafti 211 Doctoral Research AssistantDynamic Stability During Walking is Differentially Associated with Cost of

Transport in Patients With COPD Compared to Healthy Older Adults

Ryan L. Meidinger 212 Personal Trainer Neural Fatigue Accumulation or Post-Activation Potentiation

Joao R. Vaz 213 Research Associate Circadian Rhythms and Stride-To-Stride Fluctuations: Is there a Connection?

Nikolaos Papachatzis 214 Graduate Research Assistant Effects of Added Mass on Foots Mechanical Work During Walking

Corbin M. Rasmussen 215 Graduate Research Assistant Development of A Wearable Device to Administer Variable, Ecologically Valid Slips

Ian Sloan 216 Student Research Assistant Subthreshold Vibration Does Not Affect Walking Performance of Transtibial Amputees

Jenny Kent 217 Doctoral Research AssistantStability Margins are Altered on Uneven Terrain in Individuals

with a Unilateral Transtibial Amputation

Drew Dudley 218 Graduate Research Assistant The Effects of an Upper Limb Exoskeleton on Brain Activation of a Stroke Patient

Austin Duncan 219 Graduate Research AssistantBridging the Gap: Individual Relationships Between Long

Range Correlations and Dexterity in Walking

Lauren Bowman 220 Student Research Assistant Development of a Home-Based Sensory Organization Test

AUTHOR POSTER # JOB/STUDENT TITLE PRESENTATION TITLE

Cory Frederick 221 Graduate Research AssistantThe Effects of Footwear Outsole Geometry on The Biomechanics

of Walking Using Shoes with Interchangeable Outsoles

Daniel Jaravata 222 Student Research Assistant Effect of The Usage of Handrails on Gait Dynamics in People with Parkinsons Disease

Vivien Marmelat 223 Assistant Professor The Effect of Consonant vs. Dissonant Auditory Stimulation on Gait Variability

THANK YOU TO OUR SPONSORS

BIOMECHANICS RESEARCH BUILDING 6160 University Drive South | Omaha, NE 68182-0860 coe.unomaha.edu/brb

The University of Nebraska does not discriminate based on race, color, ethnicity, national origin, sex, pregnancy, sexual orientation, gender identity, religion, disability, age, genetic information, veteran status, marital status, and/or political affiliation in its programs, activities, or employment. 0572PRGMCOE0518

This conference was supported by UNO’s College of Education, Office of Research and Creative Activity,

UNEMED, Bertec, Delsys, and by the National Institute of General Medical Sciences of the National

Institutes of Health under Award Number P20GM109090. The content is solely the responsibility of the

authors and does not necessarily represent the official views of the National Institutes of Health.

facebook.com/unobrb

uno_biomechanics

youtube.com/user/unobrb

@UNOBiomechanics