Deterministic and stochastic processes in children's isometric force variability

Deutsch, Katherine M.; Newell, Karl M.

doi:10.1002/dev.10140

Cited by 32 publications

(19 citation statements)

References 27 publications

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“…DFA analysis demonstrated that without visual feedback the DFA exponent was greater than that with visual feedback for both the CTS and control groups, suggesting that absence of visual feedback reduced the structural variability of pinch forces (Athreya et al, 2012; Li et al, 2013a). This finding corroborates previous studies demonstrating that visual feedback altered the time-dependent properties of force variability during a sustained contraction by a single digit (Athreya et al, 2012; Hong and Newell, 2008; Sosnoff and Newell, 2005) or during pinch with the thumb and index finger (Deutsch and Newell, 2002, 2003; Li et al, 2013a; Vaillancourt et al, 2001). Higher irregularity of pinch force under the visual condition is probably attributed to visual-guided force correction; whereas the central nervous system exerts a less fluctuated muscle contraction in the absence of this visuomotor correction (Athreya et al, 2012; Baweja et al, 2009).…”

Section: Discussionsupporting

confidence: 92%

Carpal tunnel syndrome impairs sustained precision pinch performance

Evans

Seitz

et al. 2015

Clinical Neurophysiology

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Objective The purpose of this study was to investigate effects of carpal tunnel syndrome (CTS) on digit force control during a sustained precision pinch. Methods Eleven CTS individuals and 11 age- and gender-matched healthy volunteers participated in the study. The subjects were instructed to isometrically pinch an instrumented apparatus for 60 s with a stable force output. Visual feedback of force output was provided for the first 30 s but removed for the remaining 30 s. Pinch forces were examined for accuracy, variability, and inter-digit correlation. Results CTS led to a decrease in force accuracy and an increase in amount of force variability, particularly without visual feedback (p < 0.001). However, CTS did not affect the structure of force variability or force correlation between digits (p > 0.05). The force of the thumb was less accurate and more variable than that of the index finger for both the CTS and healthy groups (p < 0.001). Conclusions Sensorimotor deficits associated with CTS lead to inaccurate and unstable digit forces during sustained precision pinch. Significance This study shed light on basic and pathophysiological mechanisms of fine motor control and aids in development of new strategies for diagnosis and evaluation of CTS.

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Section: Discussionsupporting

confidence: 92%

Carpal tunnel syndrome impairs sustained precision pinch performance

Evans

Seitz

et al. 2015

Clinical Neurophysiology

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“…This indicates consistent agerelated improvements of TD children's isometric control of finger force/torque in all tasks. Similar findings have been reported in previous studies with finger pressing tasks [7;18;27] and pinching tasks [8][9][10].…”

supporting

confidence: 91%

Effect of kinetic redundancy on hand digit control in children with DCD

Oliveira¹,

Shim²,

Loss³

et al. 2006

Neuroscience Letters

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We investigated finger strength and the ability to control digit force/torque production in children with Developmental Coordination Disorder (DCD) using manipulative tasks with different kinetic redundancies (KNR). Age-related changes in finger strength and finger force/torque control in typically developing (TD) children were also examined to provide a developmental landscape that allows a comparison with children with DCD. Forty-eight TD children (7-, 9-, and 11-year-olds) and sixteen 9-year-old children with DCD participated in the study. Three isometric tasks with different KNR were tested: constant index finger pressing force production (KNR=0), constant thumb-index finger pinching force production (KNR=1), and constant thumb-index finger torque production (KNR=5). Each subject performed two conditions for each isometric task: maximum voluntary force/torque production and constant force/torque control (40% of maximum force/torque). The results showed that the maximum force/torque production increased and the variability of constant force/torque control decreased with age in all tasks in TD children. Children with DCD showed larger variability than TD children in the constant thumb-index finger pinching torque production. These results suggest that children with DCD, as compared to TD children, are capable of producing the same level of maximum finger force, but have poor control in manipulation tasks with a large number of kinetic redundancies. Keywords motor redundancy; finger force control; development; children; DCD For successful achievement of everyday manipulative tasks, the central nervous system (CNS) is required to control digit-tip forces and moments. During a simple multi-digit prehension task, the hand provides an infinite number of digit-tip contact force and torque solutions available to achieve the motor task. This problem is commonly referred to as motor redundancy [5;28], which requires the CNS to find a solution from the many available kinetic variables. Previous studies have addressed the problem of motor redundancy in manipulative tasks of adults, specifically during prehension of hand-held objects [24;25;29]. However, far less attention has been drawn to how children solve the problem of motor redundancy and no studies have examined how children with motor difficulties such as those with Developmental Coordination Disorder (DCD) [2] handle this problem.

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“…This interval encompasses the steady-state portion wherein participants must integrate real-time visual feedback to continuously maintain isometric force. Continuous motor tasks rely on sensory feedback mechanisms to a greater degree than discrete motor tasks, such that individuals can continuously adjust their motor output to stay on target (Deutsch and Newell 2001; Deutsch and Newell 2003). In a previous study using a similar hand-grip task, 30 seconds of visually guided force production was associated with brain activity in right-lateralized regions including dorsolateral prefrontal cortex, ventral premotor cortex, and inferior parietal lobe (IPL) (Neely et al 2013a).…”

Section: Discussionmentioning

confidence: 99%

Memory-guided force output is associated with self-reported ADHD symptoms in young adults

et al. 2016

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Attention-Deficit/Hyperactivity disorder (ADHD) is the most commonly diagnosed mental health disorder in childhood and persists into adulthood in up to 65% of cases. ADHD is associated with adverse outcomes such as the ability to gain and maintain employment (Kessler et al. 2009; Kupper et al. 2012), and is associated with an increased risk for substance abuse (Groenman et al. 2013; Upadhyaya 2008; Wilens et al. 1995), obesity (Albayrak et al. 2013; Cortese et al. 2008; Nazar et al. 2012; Nazar et al. 2014), workplace injuries (Breslin and Pole 2009; Hodgkins et al. 2011; Swensen et al. 2004), and traffic accidents (Barkley and Cox 2007; Barkley et al. 1993; Jerome et al. 2006a; Jerome et al. 2006b; Merkel et al. 2013). A majority of diagnosed children have motor deficits, however few studies have examined motor deficits in young adults. This study provides a novel examination of visuomotor control of grip force in young adults with and without ADHD. Participants were instructed to maintain force production over a 20-second trial with and without real-time visual feedback about their performance. The results demonstrated that when visual feedback was available, adults with ADHD produced slightly higher grip force than controls. However, when visual feedback was removed, adults with ADHD had a faster rate of decay of force, which was associated with ADHD symptom severity and trait impulsivity. These findings suggest that there may be important differences in the way that adults with ADHD integrate visual feedback during continuous motor tasks. These may account for some of the motor impairments reported in children with ADHD. These deficits could result from (1) dysfunctional sensory motor integration and/or (2) deficits in short-term visuomotor memory.

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Deterministic and stochastic processes in children's isometric force variability

Cited by 32 publications

References 27 publications

Carpal tunnel syndrome impairs sustained precision pinch performance

Carpal tunnel syndrome impairs sustained precision pinch performance

Effect of kinetic redundancy on hand digit control in children with DCD

Memory-guided force output is associated with self-reported ADHD symptoms in young adults

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