RuiPing (Rebecca) Xia, Ph.D.
Associate Professor, Evidence-Based Practice Content Coordinator
EDUCATION
- Ph.D. in Neurophysiology, Department of Physiology, University of Bristol, Bristol, UK
- Master of Science (M.S.) in Biomedical Engineering, Tianjin University, Tianjin, China
- Bachelor of Science (B.S.) in Biomedical Science, Tianjin University, Tianjin, China
COURSES TAUGHT
- Critical Inquiry I, II
- Expertise Practice in Physical Therapy (Capstone Course)
- Motor Control
- Neuroanatomy and Neuroscience
- Oral Defense of Research and Presentations (Capstone Course)
- Evidence-based Practice I, II, III, IV and V
- Motor Control Across the Lifespan
RESEARCH INTERESTS AND AREAS
- Evidence-based practice
- neuroscience
- sensorimotor integration
- motor control
- Parkinson's disease
- neurologic rehabilitation
- educational research
Personal Interests: Travel, work out, and reading are among top of my personal interests.
PROFESSIONAL ACTIVITIES
Teaching Statement
My philosophy of teaching is based on a foundational belief, and an old saying: 鈥淕ive
a man a fish and you feed him for a day; teach a man how to fish and you feed him
for a lifetime.鈥� I strongly believe that the goal of education in any disciplines
is to help students discover methods for lifelong learning and establish a sense of
responsibility to seek knowledge. I am a strong advocate of the 鈥淎ctive Learning鈥�
paradigm, as its effectiveness is widely supported by literature in educational research.
To reach this goal, I structure and practice my teaching based on various pedagogical
principles and techniques, to help students build critical thinking skills and develop
a systematic approach towards problem solving, and to relate course materials to real-life
situations, to list a couple of examples. I also consistently apply multiple measures
to evaluate students鈥� learning to incorporate any necessary and timely changes.
I view teaching and research complementary to each other. My research has focused
on neurologic rehabilitation and scholarship of teaching and learning. I have utilized
a variety of research designs in my work and published them in peer-reviewed journals.
In conclusion, my commitment and experience have prepared me to continuously pursue
and achieve excellence of and effectiveness of teaching!
Professional Memberships
- American Physical Therapy Association
- Society for Neuroscience
Grants Recieved
- Differentiation of Central Versus Peripheral Fatigue in Parkinson鈥檚 Disease
- Supplemental Grant to Physiological and biomechanical analyses of Parkinsonian
Service
- Member of Institutional Review Board, 51福利社
- Member of Admission Committee, Arizona Doctor of Physical Therapy (DPT), Franklin 51福利社 University
Conferences Attended
RuiPing Xia, Lauren Elinski+, Amanda Kowalsky+, Cynthia Rodriguez+, Tyler Scherwinski+.
Effect of Aerobic Exercise on Cognitive Impairment in Parkinson's Disease: A Systematic
Review. Poster presentation at American Physical Therapy Association Combined Sections
Meeting. Houston, TX; February 14, 2025.
Tamara Hefferon, RuiPing Xia, Alexis Cossyleon+, Kevin LE+, Daniel Cartagena+, Sean
Ogata+. LSVT BIG Improving Motor and Non-Motor Symptoms in Early Parkinson's Disease:
A Mixed-Methods Case Report. Poster presentation at American Physical Therapy Association
Combined Sections Meeting. Boston, MA; February 16, 2024.
RuiPing Xia, Brooke Zukowski, Cyrena Zemaitis, Emily Buczkowski. The Effect of Exercise
on Fatigue in Parkinson鈥檚 Disease: A Systematic Review. Poster presentation at American
Physical Therapy Association Combined Sections Meeting. Boston, MA; February 16, 2024.
鈥�
RuiPing Xia, Brooke Zukowski, Cyrena Zemaitis, Emily Buczkowski. The Effect of Exercise
on Fatigue in Parkinson鈥檚 Disease: A Systematic Review. Poster presentation at APTA
Arizona Fall Conference. Phoenix, AZ; October 21, 2023.
Xia R*, Baxley B, Martinez D, Mack J. Effect of exercise on motor symptoms and quality
of life in Parkinson鈥檚 disease: a systematic review. Poster presentation at APTA Combined
Sections Meeting. San Diego, CA; February 23, 2023.
Xia R*, Stanford M+, Wong C+, Santiago F+, Anglin L+. Effect of exercise on slowing
disease progression in people with Parkinson鈥檚 disease: a systematic review. APTA
Combined Sections Meeting. San Antonio, TX; February 5, 2022.
Xia R*, Morris SR. A mixed-methods study of journal club to enhance physical therapy
students鈥� appraisal skills in research. APTA Combined Sections Meeting. San Antonio,
TX; February 5, 2022.
Hennessey V+, Scott K+, Suchsland M+, Utech K+, Morris SR, Xia R*. Efficacy of manual
therapy in the treatment of migraine headache: a systematic review. American Physical
Therapy Association Combined Sections Meeting. Washington DC, January 26, 2019.
Morris SR*, Xia R*, Klaassen TS+, Yosten MA+, Johnson TA+, Mills KE+. Influence of
participation in a pro bono clinic on cultural competence in in doctor of physical
therapy students. Kansas Physical Therapy Association Spring Conference. Wichita KS,
April 9, 2018.
Kennebeck W+, Gaston K+, Tran Y+, Zarich H+, Xia R*. Efficacy of cryotherapy on spasticity
in people with neurological disorders: A systematic review. American Physical Therapy
Association Combined Sections Meeting. New Orleans, Louisiana; February 22, 2018.
Xia R*. Differentiation of neural reflex and muscular intrinsic contributions to rigidity
in Parkinson鈥檚 disease. Platform Presentation at 1st World Congress of Biomedical
Engineering. Xi鈥檃n, China; November 11, 2017.
Ronck T+, Sanft R+, Eason R+, Silvey R, Bliss B, Xia R*. Relationship between Exercise
and Fatigue Level in People with Parkinson鈥檚 Disease. APTA (American Physical Therapy
Association) Combined Sections Meeting. San Antonio, Texas; February 18, 2017.
Henning M+, Myers S+, Ooton C+, Semaan J+, Bahner C, Xia R*. Effectiveness of Exercise
Program on Reducing Fatigue in Parkinson's Disease: A Systematic Review. APTA Combined
Sections Meeting. San Antonio, Texas; February 18, 2017.
Xia R*, Bahner C, Bliss B, Bond B, Dehan J, Hendricks C, Kinslow CD, Morris S, Yoder
AW. Implementation of Journal Club in Facilitation of Doctoral Physical Therapy Students鈥�
Appraisal Skills of Research Evidence: Qualitative Exploration of Students鈥� Experiences.
APTA Combined Sections Meeting. San Antonio, Texas, February 17, 2017.
Wang KJ, Sun M, Xia R, Mao ZH*. Human-robot symbiosis framework on exoskeleton devices.
2016 IEEE International Conference on Industrial Technology, Taipei, Taiwan, March
14, 2016.
Xia R*, Bahner C, Bond B, Dehan J, Hendricks C, Kinslow CD, Yoder AW. Effect of Journal
Club on Doctor of Physical Therapy Students' Appraisal Skills of Research Evidence.
APTA Combined Sections Meeting. Anaheim, California, February 19, 2016.
Yoder AW*, Xia R. Effectiveness of Manual Therapy for Tension Type Headache: A Systematic
Review. APTA Combined Sections Meeting. Anaheim, California, February 19, 2016.
HONORS AND AWARDS
- Research Award, School of Pharmacy and Health Professions, Creighton University, Omaha
Nebraska
March 2010 - Sarah Baskin Award for Excellence in Research (1st Place)
Northwestern University/Rehabilitation Institute of Chicago, Illinois
June 2003 - National Institutes of Health Research Training Fellowship
August 1998 to March 2000
PUBLICATIONS AND PRESENTATIONS
Publications
Zukowski B, Zemaitis C, Buczkowski E, Xia R*. The effect of exercise on reducing fatigue
in patients with parkinson鈥檚 disease: a systematic review. J Behav Brain Sci, 2025;
15:95-104.
Xia R*, Baxley B, Martinez D, Mack J. Effect of exercise on motor and non-motor symptoms
in persons with Parkinson鈥檚 disease: a scoping review. Ann Neurol Neurosurg. 2024;3(1):1012.
Xia R*, Morris SR, Klappa SG, Colgrove Y. A longitudinal study of journal club to
enhance physical therapy students' research appraisal skill for evidence-based practice:
a mixed-methods study. J Allied Health. 2023;52:e93-e102.
Morris S*, Xia R*, Klaassen T, Johnson TA. Impact of pro bono clinic on attitudes,
beliefs, and confidence towards cultural competence in first-year doctoral physical
therapy students. The Internet Journal of Allied Health Sciences and Practice. 2021;19,
Article 12.
Xia R*, Ronck TJ, Sanft RA, Eason RP. Relationship between amount of exercise and
fatigue in people with Parkinson鈥檚 disease. EC Neurol 2020;12.7:58-66.
Powell DW, Blackmore SE, Puppa M, Lester D, Murray NG, Reed-Jones RJ, Xia R*. Deep
brain stimulation enhances movement complexity during gait in individuals with Parkinson's
disease. Neurosci Lett. 2020;728:133588.
Henning M+, Myers S+, Ooton C+, Semaan J+, Xia R*. Effectiveness of exercise program
on reducing fatigue in Parkinson's disease: a systematic review. EC Neurology, 2017;9:12-19.
Xia R*, Gillig C+, Mueller D+, Ludwig M+, Schmith Z+. Effect of cooling intervention
on reducing rigidity in Parkinson鈥檚 disease: A case report. Ann Clin Case Rep. 2017;2:1-4.
Powell D, Muthumani A, Xia R*. Normalizing EMG to background muscle activation masks
medication-induced reductions in reflex amplitudes in parkinsonian rigidity. J Nat
Sci. 2017;3:315-319.
Xia R*, Muthumani A, Mao ZH, Powell DW. Quantification of neural reflex and muscular
intrinsic contributions to parkinsonian rigidity. Exp Brain Res. 2016;234:3587-3595.
Powell DW, Muthumani A, Xia R*. A comparison of the effects of continuous versus discontinuous
movement patterns on parkinsonian rigidity and reflex responses to passive stretch
and shortening. J Nat Sci 2016, 2(8): e201.
Xia R*, Stone JR, Hoffman JE, Klappa SG. Promoting community health and eliminating
health disparities through community-based participatory research. Phys Ther 2016;96:410-417.
The article above was featured in a Podcast interview with the Editor-in-Chief of
Physical Therapy journal (PTJ), which is the official journal of the American Physical
Therapy Association
Powell D, Muthumani A, Xia R*. Parkinson's disease is associated with greater regularity
of repetitive voluntary movements. Motor Control 2014;18:263-277.
Lupu MF, Sun M, Xia R, Mao ZH*. Rate of information transmission in human manual control
of an unstable system. IEEE Transactions on Human-Machine Systems, 2013; 43:259-263.
Xia R*, Mao ZH. Progression of motor symptoms in Parkinson鈥檚 disease. Neurosci Bull.
2012;28:39-48.
Powell D, Threlkeld AJ, Xiang Fang, Muthumani A, Xia R*. Amplitude- and velocity-dependency
of rigidity measured at the wrist in Parkinson鈥檚 disease. Clin Neurophysiol. 2012;123:764-773.
Xia R. Physiological and biomechanical analyses of rigidity in Parkinson鈥檚 disease.
In: Rana A, eds. Etiology and Pathophysiology of Parkinson鈥檚 Disease, InTech, Vienna,
Austria, 2011;pp.485-506.
Xia R*, Powell D, Rymer WZ, Hanson N, Fang X, Threlkeld AJ. Differentiation of contributions
between shortening reaction and stretch-induced inhibition in Parkinson鈥檚 disease.
Exp Brain Res. 2011;209:609-618.
Powell D, Hanson N, Threlkeld AJ, Fang X, Xia R*. Enhancement of parkinsonian rigidity
with contralateral hand activation. Clin Neurophysiol. 2011;122:1595-1601.
Xia R*. Effectiveness of nutritional supplements on reducing symptoms in autism spectrum
disorder. J Altern Complement Med. 2011;17:271-274.
Xia R*, Sun J, Threlkeld AJ. Analysis of interactive effect of stretch reflex and
shortening reaction on rigidity in Parkinson's disease. Clin Neurophysiol 2009;120:1400-1407.
Xia R*, Bush BM. Modulation of reflex responses in hand muscles during rhythmical
finger tasks in a subject with writer鈥檚 cramp. Exp Brain Res. 2007;177:573-578.
Xia R*, Markopoulou K, Puumala SE, Rymer WZ. A comparison of the effects of imposed
extension and flexion movements on Parkinsonian rigidity. Clin Neurophysiol. 2006;117:2302-2307.
Xia R*, Bush BM, Karst GM. Phase-dependent and task-dependent modulation of stretch
reflexes during rhythmical hand tasks. J Physiol. 2005;564:941-951.
Xia R, Rymer WZ*. Reflex reciprocal facilitation of antagonist muscles in spinal cord
injury. Spinal Cord 2005;43:14-21.
Xia R, Rymer WZ*. The role of shortening reaction in mediating rigidity in Parkinson鈥檚
disease. Exp Brain Res. 2004;156:524-528.
Xia R, Barnes GR*. Oculo-manual co-ordination in tracking of pseudo-random target
motion stimuli. J Mot Behav. 1999;31:21-38.
Odemuyiwa O, Poloniecki J, Malik M, Farrell T, Xia R, Staunton A, Kulakowski P, Ward
D, Camm AJ*. Temporal influences on the prediction of postinfarction mortality by
heart rate variability: A comparison with the left ventricular ejection fraction.
Br Heart J. 1994;71:521-527.
Xia R, Odemuyiwa O, Gill J, Malik M, Camm AJ*. Influence of recognition errors of
computerized analysis of 24-hour electrocardiograms on the measurement of spectral
components of heart rate variability. Int J Biomed Comput. 1993;32:223-235.
Malik M*, Xia R, Odemuyiwa O, Staunton A, Poloniecki J, Camm AJ. Influence of the
recognition artefact in automatic analysis of long-term electrocardiograms on time-domain
measurement of heart rate variability. Med Biol Eng Comput 1993;31:539-544.
Gill J, Baszko A, Xia R, Ward DE, Camm AJ*. Dynamics of the QT interval in patients
with exercise-induced ventricular tachycardia in normal and abnormal hearts. Am Heart
J. 1993;126:1357-1363.
Kautzner J, Xia R, Hnatkova K, Staunton A. Reproducibility of Time- and Frequency-Domain
Indices of Heart Rate Variability Assessed after Acute Myocardial Infarction. In:
Murray A ed. 鈥楥omputers in Cardiology鈥� 1st edition Los Alamitos: IEEE Computer Society
Press, 1993;pp483-486.
Odemuyiwa O, Malik M, Xia R, Poloniecki J, Farrell T, Staunton A, Camm AJ*. Influence
of the noise and artifact in automatically analyzed long term electrocardiograms on
different methods of calculating heart rate variability. European Heart J. 1992;13:367.
Xia R, Odemuyiwa O, Murgatroyd FD, Gill J, Malik M*, Camm AJ. Influence of the artifact
of computerized analysis of 24-hour electrocardiograms on the measurement of spectral
components of heart rate variability. In: Murray A ed. 鈥楥omputers in Cardiology鈥� 1st
edition Los Alamitos: IEEE Computer Society Press, 1992;pp87-90.
Malik M*, Xia R, Odemuyiwa O, Staunton A, Poloniecki J, Camm AJ. Influence of the
recognition artifact in automatic analysis of long-term electrocardiograms on time-domain
measurement of heart rate variability. In: Murray A ed. 鈥楥omputers in Cardiology鈥�
1st edition Los Alamitos: IEEE Computer Society Press, 1991;pp269-272
grants
Role: Principal investigator (Principal Investigator/PI - Xia)
Amount: $110,992.00
Title of Research: Supplemental Grant to Physiological and biomechanical analyses
of Parkinsonian rigidity, issued under American Reinvestment in Recover Act 2009
Date: 09/30/09 to 09/29/11
Source: National Institutes of Health (National Center for Medical Rehabilitation
Research)
External funding
Role: Principal investigator (PI - Xia)
Amount: $223,711.00
Title of Research: Physiological and biomechanical analyses of Parkinsonian rigidity
Date: 01/15/09 to 12/31/11
Source: National Institutes of Health (National Center for Medical Rehabilitation
Research)
External funding
Role: Co-investigator (Co-I; PI: Threlkeld)
Amount: $360,981.00
Title of Research: Differentiation of Central Versus Peripheral Fatigue in Parkinson鈥檚
Disease
Date: 08/01/12 to 07/31/14
Source: National Institute on Aging
External funding
Other Grants (external and interval)
Role: Research Mentor to Student PI (Garza; Tenpenny)
Amount: $3000.00
Title of Project: LSVT BIG to manage motor and nonmotor symptoms in Parkinson鈥檚 disease:
a mixed methods study
Date: 09/01/2023 to 08/31/2025
Source: The LSVT Global
External funding
Role: Project Director
Amount: $500.00
Title of Project: Global Campaign of the Brain Awareness Movement
Date: 01/01/15 to 05/31/15
Source: University of Saint Mary
Internal funding
Role: Co-investigator (Co-I; PI: Nelson)
Amount: $2,200.00
Title of SoTL (Scholarship of Teaching and Learning): Assessing physical therapy students鈥�
perceptions related to the utility of the Kinect video gaming system for balance and
movement interventions
Date: 01/12/11 to 12/31/11
Source: Creighton University Office for Academic Excellence and Assessment (AEA)
Internal funding
Role: Principal investigator (PI)
Amount: $20,000.00
Title of Research: System Identification and Modeling Approach to Characterizing Rigidity
in Parkinson鈥檚 Disease
Date: 07/01/08 to 06/30/10
Source: Creighton University Health Future Foundation Faculty Development Award
Internal funding
Role: Co-Principal Investigator (Co-PI; Co-PI: Fleck)
Amount: $2,000.00
Title of SoTL (Scholarship of Teaching and Learning): Attitudes of Doctoral Occupational
Therapy and Physical Therapy Students Toward Coursework in Critical Inquiry Research
and Evidence Based Practice
Date: 03/01/09 to 02/28/10
Source: Creighton University Office for Academic Excellence and Assessment (AEA)
Internal funding
Role: Principal investigator (PI)
Amount: $40,000.00
Title of Research: Quantification of bradykinesia and rigidity in Parkinson鈥檚 disease
Date: 10/01/06 鈥� 09/30/09
Source: Creighton University, School of Pharmacy and Health Professions
Internal funding
Role: Principal investigator (PI)
Amount: $124,000.00
Title of Research: Physiological mechanism of rigidity in Parkinson鈥檚 disease
Date: 08/15/03 鈥� 09/30/06
Source: Nebraska Tobacco Settlement Biomedical Research Development Fund
Internal funding
Role: Co-investigator (Co-I; PI: Rymer/Schmidt)
Amount: $50,000.00
Title of Research: Physiology of rigidity in Parkinson鈥檚 disease
Date: 03/01/02 to 02/28/03
Source: NIH - National Institute of Neurological Disorders and Stroke
External funding
Role: Co-principal investigator (Co-PI; PI: Rymer)
Amount: $99,557.00
Title of Research: Pathophysiology of muscle spasms in spinal cord injury
Date: 03/01/00 to 02/28/02
Source: Paralyzed Veterans of America 鈥� Spinal Cord Research Foundation
External funding
Professional Memberships
Member of Society for Neuroscience
Faculty Partners, American Physical Therapy Association
Presentations (selected ones within the past 10 years)
Hennessey V, Scott K, Suchsland M, Utech K, Morris SR, Xia R. Efficacy of manual therapy in the treatment of migraine headache: a systematic review. American Physical Therapy Association Combined Sections Meeting. Washington DC, January 26, 2019.Morris SR, Xia R, Klaassen TS, Yosten MA, Johnson TA, Mills KE. Influence of participation in a pro bono clinic on cultural competence in in doctor of physical therapy students. Kansas Physical Therapy Association Spring Conference. Wichita KS, April 9, 2018
Kennebeck W, Gaston K, Tran Y, Zarich H, Xia R. Efficacy of cryotherapy on spasticity in people with neurological disorders: A systematic review. American Physical Therapy Association Combined Sections Meeting. New Orleans, Louisiana; February 22, 2018
Xia R. Differentiation of neural reflex and muscular intrinsic contributions to rigidity in Parkinson鈥檚 disease. Platform Presentation at 1st World Congress of Biomedical Engineering. Xi鈥檃n, China; November 11, 2017
Ronck T, Sanft R, Eason R, Silvey R, Bliss B, Xia R. Relationship between Exercise and Fatigue Level in People with Parkinson鈥檚 Disease. APTA (American Physical Therapy Association) Combined Sections Meeting. San Antonio, Texas; February 18, 2017
Henning M, Myers S, Ooton C, Semaan J, Bahner C, Xia R. Effectiveness of Exercise Program on Reducing Fatigue in Parkinson's Disease: A Systematic Review. APTA Combined Sections Meeting. San Antonio, Texas; February 18, 2017
Xia R, Bahner C, Bliss B, Bond B, Dehan J, Hendricks C, Kinslow CD, Morris S, Yoder AW. Implementation of Journal Club in Facilitation of Doctoral Physical Therapy Students鈥� Appraisal Skills of Research Evidence: Qualitative Exploration of Students鈥� Experiences. APTA Combined Sections Meeting. San Antonio, Texas, February 17, 2017
Wang KJ, Sun M, Xia R, Mao ZH. Human-robot symbiosis framework on exoskeleton devices. 2016 IEEE International Conference on Industrial Technology, Taipei, Taiwan, March 14, 2016
Xia R, Bahner C, Bond B, Dehan J, Hendricks C, Kinslow CD, Yoder AW. Effect of Journal Club on Doctor of Physical Therapy Students' Appraisal Skills of Research Evidence. APTA Combined Sections Meeting. Anaheim, California, February 19, 2016
Yoder AW, Xia R. Effectiveness of Manual Therapy for Tension Type Headache: A Systematic Review. APTA Combined Sections Meeting. Anaheim, California, February 19, 2016
Xia R. Muthumani A, Mao ZH, Powell D. Natural history of rigidity in Parkinson鈥檚 disease. Society for Neuroscience 45th Annual Meeting, Chicago IL, USA, October 19, 2015
Xia R. Bringing neuroscience from classroom to community. Society for Neuroscience 45th Annual Meeting, Chicago IL, USA, October 17, 2015
Wang KJ, Sun M, Xia R, Mao ZH. Co-Adaptive optimal control framework for human-robot physical symbiosis. The 10th Annual ACM/IEEE International Conference on Human-Robot Interaction, Portland OR, March 3, 2015
Xia R, Klappa S. Relationship between learning outcomes and students鈥� attitudes toward evidence-based physical therapy course. APTA Combined Sections Meeting No. 2153, Indianapolis IN, February 6, 2015
Xia R, Powell D, Mao ZH. Comparison of progression rate between neural and non-neural rigidity components in Parkinson鈥檚 disease. Society for Neuroscience 44th Annual Meeting, Washington DC, USA, November 15, 2014
Powell D, Muthumani A, Fang X, Threlkeld AJ, Xia R. Contralateral activation and enhanced rigidity in Parkinson's disease: neural and non-neural contributions. 17th Canadian Society for Biomechanics, Barnaby BC, Canada, June 2012
Kremer L, Wagner L, Muthumani A, Powell D, Threlkeld A, Xia R. Quantitative Evaluation of Parkinsonian Rigidity Progression over Time. APTA Combined Sections Meeting, Chicago Illinois, February 2012
Gillman AC, Lindseth NM, Beisel LH, Powell D, Xia R, Threlkeld AJ. Assessing lower extremity muscle fatigue: Do isometric and isokinetic protocols provide equivalent measures? APTA Combined Sections Meeting, Chicago Illinois, February 2012
Delavan J, Simonson B, Xia R, Threlkeld AJ, Powell D+. Physical activity patterns are similar in old adults and individuals with Parkinson鈥檚 disease. APTA Combined Sections Meeting, Chicago Illinois, February 2012
Powell D, Benes A, Konor M, Hanson NJ, Kerschen K, Gustafson A, Xia R, Threlkeld AJ. Mechanical and neurophysiological manifestations of fatigue in Parkinson鈥檚 disease. APTA Combined Sections Meeting, Chicago Illinois, February 2012
Powell D, Muthumani A, Hanson NJ, Threlkeld AJ, Xia R. Velocity dependency of parkinsonian rigidity assessed at the wrist joint. 35th Annual Meeting of the American Society of Biomechanics. Long Beach CA, August 2011
Muthumani A, Powell D, Hanson NJ, Kremer L, Wagner L, Threlkeld AJ, Xia R. Relationship between neural-reflex torque and muscle reflex response in parkinsonian rigidity. 35th Annual Meeting of the American Society of Biomechanics. Long Beach CA, August 2011
Muthumani A, Powell D, Haider H, Threlkeld AJ, Xia R. Relationship between movement speed and regularity of movement in Parkinson鈥檚 disease. 35th Annual Meeting of the American Society of Biomechanics. Long Beach CA, August 2011
Xia R, Hanson NJ, Powell D, Muthumani A, Bertoni J, Threlkeld AJ. Efficacy of dopaminergic medication on neural and non-neural components of rigidity in Parkinson鈥檚 disease. The MDS 15th International Congress of Parkinson鈥檚 disease and Movement Disorders. Toronto Ontario, Canada. June 2011
Threlkeld AJ, Hanson NJ, Powell D, Kerschen K, Gustafson A, Xia R. Voluntary Activation of the Quadriceps Muscle in Parkinson's Disease. Platform presentation at the APTA Combined Sections Meeting, New Orleans LA, February 2011
Powell D, Hanson NJ, Threlkeld AJ, Xia R. Effect of Contralateral Hand Activation on Enhancement of Parkinsonian Rigidity. Poster presentation at the APTA Combined Sections Meeting, New Orleans LA, February 2011
Threlkeld AJ, Kerschen K, Gustafson A, Hanson NJ, Powell D, Xia R. Fatigue of the Quadriceps in Parkinson's Disease is Dependent on Contraction Speed. Poster presentation at the APTA Combined Sections Meeting, New Orleans LA, February 2011.
Community Service
Editorial board member of Journal of Behavioral and Brain Science
Editorial board member of Open Journal of Molecular and Integrative Physiology
Manuscript reviewer for Journal of Neurologic Physical Therapy, Spinal Cord, Clinical
Neurophysiology; Experimental Brain Research, and others
Church choir member, Northwest Chinese Baptist Church, Phoenix AZ
Interpreter, Northwest Chinese Baptist Church, Phoenix AZ