High-gain visual feedback exacerbates ankle movement variability in children

Moon, Hwasil; Kim, Changki; Kwon, Min-hyuk; Chen, Yen‐Ting; Fox, Emily J.; Christou, Evangelos A.

doi:10.1007/s00221-015-4234-8

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…It is commonly known that during development, children display less coordinated movements than adults and have incomplete development of their sensorimotor system (Moon et al, 2015). Children also face an even higher amount of ever changing environmental demands due to the growth of their body; especially their lower extremities.…”

Section: Introductionmentioning

confidence: 99%

Age-related differences in the motor planning of a lower leg target matching task

Davies

Gehringer

Kurz

2015

Human Movement Science

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While the development and execution of upper extremity motor plans have been well explored, little is known about how individuals plan and execute rapid, goal-directed motor tasks with the lower extremities. Furthermore, the amount of time needed to integrate the proper amount of visual and proprioceptive feedback before being able to accurately execute a goal-directed movement is not well understood; especially in children. Therefore, the purpose of this study was to initially interrogate how the amount of motor planning time provided to a child before movement execution may influence the preparation and execution of a lower leg goal-directed movement. The results displayed that the amount of pre-movement motor planning time provided may influence the reaction time and accuracy of a goal directed leg movement. All subjects in the study had longer reaction times and less accurate movements when no pre-movement motor planning time was provided. In addition, the children had slower reaction times, slower movements, and less accurate movements than the adults for all the presented targets and motor planning times. These results highlight that children may require more time to successfully plan a goal directed movement with the lower extremity. This suggests that children may potentially have less robust internal models than adults for these types of motor skills.

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Section: Introductionmentioning

confidence: 99%

Age-related differences in the motor planning of a lower leg target matching task

Davies

Gehringer

Kurz

2015

Human Movement Science

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Neuromuscular variability and spatial accuracy in children and older adults

Casamento‐Moran

Fleeman

Chen

et al. 2018

Journal of Electromyography and Kinesiology

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Lower Extremity Muscle Strength and Force Variability in Persons With Parkinson Disease

Skinner

Christou

Hass

2019

Journal of Neurologic Physical Therapy

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Background and Purpose: Adequate lower limb strength and motor control are essential for mobility and quality of life. People with Parkinson disease (PD) experience a significant and progressive decline in motor capabilities as part of this neurodegenerative disease. The primary objective of this study was to examine the effect of PD on (1) muscular strength and (2) force steadiness in muscles that are primarily responsible for locomotion and stability. Methods: Thirteen persons with PD and 13 healthy age-matched controls participated. Participants performed maximal and submaximal (5%, 10%, and 20% maximum voluntary contractions) isometric force tasks with the limb stabilized in a customized device. Strength of the hip extensors and flexors, hip abductors and adductors, and ankle plantar flexors and dorsiflexors was quantified based on data obtained from force transducers, with the relevant joint stabilized in standardized positions. Results: Individuals with PD were weaker and exhibited higher amounts of force variability than controls across the lower extremity. Reduced strength was greatest in the hip flexors (2.0 N/kg vs 2.6 N/kg) and ankle plantar flexors (1.74 N/kg vs 2.64 N/kg) and dorsiflexors (1.9 N/kg vs 2.3 N/kg). Force steadiness was impaired in the hip flexors, ankle plantar flexors, and dorsiflexors. Discussion and Conclusions: Reduced maximal force production was concomitant with impaired force control within the muscles that are critical for effective ambulation (hip flexion, ankle dorsiflexion, and ankle plantar flexion). These features should be evaluated when considering contributors to reduced mobility and quality of life. Video Abstract available for more insights from the authors (see Video, Supplemental Digital Content 1, available at: http://links.lww.com/JNPT/A241).

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High-gain visual feedback exacerbates ankle movement variability in children

Cited by 3 publications

References 36 publications

Age-related differences in the motor planning of a lower leg target matching task

Age-related differences in the motor planning of a lower leg target matching task

Neuromuscular variability and spatial accuracy in children and older adults

Lower Extremity Muscle Strength and Force Variability in Persons With Parkinson Disease

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