Dr. Jeff Haddad

Associate Professor
Department of Health and Kinesiology


Lambert Fieldhouse, Room 210A
(765) 496-9489


PhD in Kinesiology from University of Massachusetts at Amherst
MS in Kinesiology from University of Massachusetts at Amherst
BS in Kinesiology from University of Massachusetts at Amherst

Research Interests

Motor control; Balance; Dynamical systems

Dr. Jeff Haddad

Research description

My research explores changes in postural stability, manual control, and locomotion that occur as a function of age, development, and disease. I am particularly interested in how individuals across the life-span adapt their motor behaviors in varying contexts. Using a variety of analytical techniques (inspired from non-linear dynamics and chaos theory), my research has suggested that motor variability is a functional component of typical movement production. Specifically, nonrandom structured variations in generated movements aid the development of motor skills, increase balance control, and improve the ability of the motor system to successfully adapt and coordinate movements based on the context of the task and environment.

Currently, I am investigating decline that occurs in the integration between posture and other supra-postural behaviors in aged populations. This research is specifically examining ways to improve balance (reduce fall risk) in older individuals and individuals with Parkinson’s disease as they perform typical daily standing multi-task activities such as talking while producing precision hand movements.

Selected Publications

Liddy JJ, Haddad JM (2017). Evenly spaced detrended fluctuation analysis: Selecting the number of points for the diffusion plotPhysica A: Statistical Mechanics and its Applications, To appear

Liddy JJ, Zelaznik HN, Huber JE, Rietdyk S, Claxton LJ, Samuel A, Haddad JM (2016). The efficacy of Microsoft Kinect(TM) to assess human bimanual coordination. Behavioral Research Methods, pp:1-18

Chagdes JR, Rietdyk S, Haddad JM, Zelaznik HN, Cinelli ME, Denomme L, Powers K, Raman A (2016). Limit cycle oscillations in standing human posture. Journal of Biomechanics, 49(7):1170-1179 

Chagdes JR, Huber JE, White MD, Rietdyk S, Zelaznik HN, Haddad JM (2016). The relationship between intermittent limit cycles and postural instability associated with Parkinson's disease. Journal of Sport and Health Science. 5(1):14-24

Kim H, Cai F, Ryu JH, Haddad JM, Zelaznik HN (2015).  Tennis match time series do not exhibit long term correlations. International Journal of Sport Psychology, 46:542-545

Muir BC, Haddad JM, Rietdyk S (2015). Proactive Gait Strategies to Mitigate Risk of Obstacle Contact are more Prevalent with Advancing Age. Gait and Posture, 41(1):233-239

O’Brien KM, Zhang J, Walley PR, Rhoads JF, Haddad JM, Claxton LJ (2015). A Model to Investigate the Mechanisms Underlying the Emergence and Development of Independent Sitting. Developmental Science, 18(4):622-634

Muir BC, Rietdyk S, Haddad JM (2014). Gait initiation: the first four steps in young adults, adults aged 65-79 years, and adults aged 80-91 years.  Gait & Posture, 39:490-494

Chagdes JC, Rietdyk S, Haddad JM, Zelaznik HN, Raman A (2013). Nonlinear dynamics of human postural stability on balance boards. Journal of Biomechanics, in press.

Claxton LJ, Haddad JM, Ponto, K., Ryu, J.H., & Newcomer, S.C. (2013). Newly standing infants increase postural stability when performing a supra-postural task. PLoS ONE 8(8), e71288

Haddad JM, Claxton LJ, Melzer DK, Hamill J, Van Emmerik R (2013).  Developmental changes in postural stability during the performance of a precision manual task. Journal of Motor Learning and Development, 1:12-19

Haddad JM, Rietdyk S, Claxton LJ, Huber JE (2013).  Task dependent postural control throughout the lifespan. Exercise and Sport Sciences Reviews, 41(2):123-132

Claxton LJ, Melzer D, Ryu JH, Haddad JM (2012). The control of posture is newly standing infants is task dependent. Journal of Experimental Child Psychology, 113:159-165

Haddad JM, Rietdyk S, Claxton, LJ (2012). Exercise training to improve independence and quality of life in impaired individuals: A commentary on Li and Hondzinski’s “Reversal of movement dysfunction due to peripheral neuropathy with exercise modalities”. Exercise and Sports Science Reviews, 40:117.

Haddad JM, Claxton LJ, Keen R, Berthier NE, Riccio GE, Hamill J, Van Emmerik REA (2012). Development of the coordination between posture and manual control.  Journal of Experimental Child Psychology, 111:286-298

Wheat JS, Haddad JM, Scaife R (2012). Between-day reliability of time-to-contact measures used to assess postural stability.  Gait & Posture, 35:345-347

Haddad JM, Rietdyk S, Ryu JH, Seaman JM, Silver TA, Kalish JA, Hughes CML (2011).  Postural asymmetries in response to holding evenly and unevenly distributed loads during self-selected stance.  Journal of Motor Behavior, 43:345-355

Hughes CML, Haddad JM, Franz EA, Zelaznik HN, Ryu JH (2011). Physically coupling objects in a bimanual task alters kinematics but not end-state comfort. Experimental Brain Research, 211:219-229

Rhea CK, Silver TA, Hong SL, Ryu JH, Studenka BE, Hughes CML, Haddad JM (2011). Noise and complexity in human postural control:  Interpreting the different estimations of entropy, PLoS One, 6, e17696, 1-9

Haddad JM, Chen Y, Keen R (2011). Preschoolers search for hidden objects, Journal of Experimental Child Psychology, 109:123-131

Haddad JM, Ryu JH, Seaman JM, Ponto K (2010). Time-to-contact measures capture modulations in posture that occur due to the precision demands of a manual task, Gait & Posture, 32:592-596

Rhea CK, Rietdyk S, Haddad JM (2010). Locomotor adaptation versus perception adaptation when stepping over an obstacle with a height Illusion. PLoS One, 5, e11544, 1-4

Haddad JM, van Emmerik REA, Wheat JS, Hamill J, Snapp-Childs W (2010). The use of continuous relative phase to assess dynamic gait symmetry.  Journal of Applied Biomechanics, 26:109-113

Chagdes J, Rietdyk S, Haddad JM, Zelaznik HN, Raman A, Rhea CK, Silver TA (2009). Multiple timescales in postural dynamics associated with vision and a secondary task are revealed by wavelet analysis.  Experimental Brain Research, 197:297-310

Haddad JM, van Emmerik REA, Wheat J, Hamill J (2008). Developmental changes in the dynamical structure of postural sway during a precision fitting task. Experimental Brain Research, 190:431-441

Hasson CJ, van Emmerik REA, Caldwell GE, Haddad JM, Gagnon J, Hamill J (2008). The Influence of embedding parameters and noise in center of pressure recurrence quantification analysis. Gait & Posture, 27:416-422 

Haddad JM, Kloos H, Keen R (2008). Conflicting cues in a dynamic search task are reflected in children’s eye movements and search errors. Developmental Science, 11:504-515.

Morgante JD, Haddad JM, Keen R (2008). Preschoolers’ oculomotor behavior during their observation of an action task. Visual Cognition, 16:430-438

Haddad JM, Gagnon J, Hasson CJ, van Emmerik REA, Hamill J (2006).  Evaluation of time-to-contact measures for assessing postural stability. Journal of Applied Biomechanics, 22:155-161

Haddad JM, van Emmerik REA, Whittlesey SN, Hamill J (2006). Adaptations in interlimb and intralimb coordination to asymmetrical loading in human walking.  Gait & Posture, 23:429-434

Kloos H, Haddad JM, Keen R (2006).  Which cues are available to 24-month-olds? Evidence from point-of-gaze measures during search.  Infant Behavior & Development, 29:243-250

Seay J, Haddad JM, van Emmerik REA, Hamill J (2006).  Coordination variability around the walk to run transition during human locomotion, Motor Control, 10:178-196

Li L, Haddad JM, Hamill J  (2005). Stability and variability may respond differently to changes in walking speed.  Human Movement Science, 24:257-267 

van Emmerik REA, McDermott WM, Van Wegen EEH, Haddad JM  (2005). Age-related changes in upper body adaptation to walking speed in human locomotion. Gait & Posture, 22:233-239

Peters BT, Haddad JM, Heiderscheit BC, van Emmerik  REA, Hamill J  (2003). Limitations in the use and interpretation of continuous relative phase.  Journal of Biomechanics, 36:271-274

Hamill J, Haddad JM, McDermott WM (2000). Issues in quantifying variability from a dynamical systems perspective.  Journal of Applied Biomechanics, 16:407-419

Current Students

Hoda Salsabili (Health and Kinesiology)
Expected Degree: PhD

Josh Liddy (Health and Kinesiology)
Expected Degree: PhD

Past Students

Brittney Muir (PhD - 2015)
The effects of locomotor task challenge on the gait strategies of young, middle-aged and older adults
Assistant professor of Occupational Therapy and Physical Therapy, The Sage Colleges

Charmayne Huges (PhD - 2010)
The effects of physical object coupling on inter-limb coordination
San Francisco State University

Joshua Liddy (MS – 2014)
Thesis: Using the Microsoft Kinect to Assess Human Bimanual Coordination

Tiphanie Raffegeau (MS – 2013)
Thesis: The relationship between mobility and communication in young healthy adults

Jessica Seaman (MS – 2011)
Thesis: The development of intra- and inter- limb coordination