Effect of intense functional task training upon temporal structure of variability of upper extremity post stroke

Sethi, Amit; Davis, Sandra B.; McGuirk, Theresa E.; Patterson, Tara S.; Richards, Lorie

doi:10.1016/j.jht.2012.09.001

Cited by 16 publications

(36 citation statements)

References 26 publications

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“…Finally, while SampEn is one among the many available non-linear dynamics metrics, numerous researchers have used other techniques such as approximate entropy (ApEn), de-trended fluctuation analysis (DFA) and Lyapunov exponent (Ly Ep) to study the time dependent structure of human movement [28, 35, 48, 49]. All these studies reported that physiologic time series complexity is sensitive to age, pathology and functional state in humans.…”

Section: Discussionmentioning

confidence: 99%

Shoulder pain and time dependent structure in wheelchair propulsion variability

Jayaraman

Moon

Sosnoff

2016

Medical Engineering & Physics

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Manual wheelchair propulsion places considerable repetitive mechanical strain on the upper limbs leading to shoulder injury and pain. While recent research indicates that the amount of variability in wheelchair propulsion and shoulder pain may be related. There has been minimal inquiry into the fluctuation over time (i.e. time-dependent structure) in wheelchair propulsion variability. Consequently the purpose of this investigation was to examine if the time-dependent structure in the wheelchair propulsion parameters are related to shoulder pain. 27 experienced wheelchair users manually propelled their own wheelchair fitted with a SMARTWheel on a roller at 1.1 m/s for 3 minutes. Time-dependent structure of cycle-to-cycle fluctuations in contact angle and inter push time interval was quantified using sample entropy (SampEn) and compared between the groups with/without shoulder pain using non-parametric statistics. Overall findings were, (1) variability observed in contact angle fluctuations during manual wheelchair propulsion is structured (Z=3.15;p<0.05), (2) individuals with shoulder pain exhibited higher SampEn magnitude for contact angle during wheelchair propulsion than those without pain (χ2(1)=6.12;p<0.05); and (3) SampEn of contact angle correlated significantly with self-reported shoulder pain (rs (WUSPI) =0.41;rs (VAS)=0.56;p<0.05). It was concluded that the time-dependent structure in wheelchair propulsion may provide novel information for tracking and monitoring shoulder pain.

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Section: Discussionmentioning

confidence: 99%

Shoulder pain and time dependent structure in wheelchair propulsion variability

Jayaraman

Moon

Sosnoff

2016

Medical Engineering & Physics

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“…Therefore, to minimize participant burden all subsequent participants performed only four trials in each condition, with the first serving as a practice trial. Additionally, we have validated this approach with similar number of trials in previous studies (Sethi, Davis, McGuirk, Patterson, & Richards, 2013; Sethi, Patterson, et al, 2013). …”

Section: Methodsmentioning

confidence: 60%

Speed and Rhythm Affect Temporal Structure of Variability in Reaching Poststroke: A Pilot Study

Sethi

Stergiou

Patterson

et al. 2016

Journal of Motor Behavior

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Temporal structure reveals the potential adaptive strategies employed during upper extremity movements. The authors compared the temporal structure of upper extremity joints under 3 different reaching conditions: preferred speed, fast speed, and reaching with rhythmic auditory cues in 10 individuals post-stroke. They also investigated the temporal structure of these 3 reaching conditions in 8 healthy controls to aid in the interpretation of the observed patterns in the poststroke cohort. Approximate entropy (ApEn) was used to measure the temporal structure of the upper extremity joints. ApEn was similar between conditions in controls. After stroke, ApEn was significantly higher for shoulder, elbow, and wrist both at fast speed and with rhythmic cues compared with preferred speed. ApEn at index finger was significantly higher only with rhythmic cues compared with preferred speed. The authors propose that practice reaching at faster speed and with rhythmic cues as a component of rehabilitation interventions may enhance adaptability after stroke. Keywords nonlinear; rhythm; stroke; temporal structure; upper extremity Stroke is the leading cause of adult-onset disability in the United States (American Heart Association, 2016). Up to 85% of individuals with stroke exhibit upper extremity (UE) paresis immediately poststroke (Kwakkel & Kollen, 2007;Kwakkel, Kollen, van der Grond, & Prevo, 2003;Olsen, 1990). Recent advances in our understanding of the principles of neuroplasticity provide motivation for development of interventions enhancing UE function in stroke survivors (Jang et al., 2003;Liepert, Graef, Uhde, Leidner, & Weiller, 2000; Correspondence address: Amit Sethi, Assistant Professor, Department of Occupational Therapy, School of Health and Rehabilitation Sciences, University of Pittsburgh, 5019 Forbes Tower, Pittsburgh, PA 15260, USA. asethi@pitt.edu. HHS Public AccessAuthor manuscript J Mot Behav. Author manuscript; available in PMC 2018 January 01. Author Manuscript Author ManuscriptAuthor ManuscriptAuthor Manuscript Sawaki et al., 2008;Wolf et al., 2006). Regrettably, despite advanced rehabilitation approaches, residual UE impairments still persist. Current clinical assessment tools do not sensitively quantify the underlying motor impairments, limiting the ability to detect clinically important change in response to rehabilitation interventions. Insights provided by contemporary analyses are needed to better detect motor impairments and develop potentially more targeted and effective rehabilitation interventions after stroke.While clinical and biomechanical (kinematic) assessments of UE movements are typically used to characterize motor impairments, measures that quantify movement variability offer a unique advantage to assess motor adaptability during performance of everyday tasks (Stergiou & Decker, 2011). However, these approaches have received less attention in clinical motor assessment and rehabilitation studies. Variability in reaching movements, which is characterized by the ability to u...

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“…Arm function is one of the most important functions of the human daily environment, and it a very important component of quality of life. Up to 85% of all the persons with stroke have an impaired arm [3,4]. Arm dysfunction is one of the biggest problems in patients with a residual cerebral infarction.…”

Section: Introductionmentioning

confidence: 99%

“…Arm dysfunction leads to movement limitations and sensory disorders, and a person cannot independently perform a variety of daily tasks. Therefore, the rehabilitation of the affected arm remains a challenge and aims at fast and highquality recovery of the arm function [3,4].…”

Section: Introductionmentioning

confidence: 99%