The Use of Open- and Closed-Loop Control During Goal-Directed Force Responses by Children with Heavy Prenatal Alcohol Exposure.
Alcohol Clin Exp Res
; 39(9): 1814-22, 2015 Sep.
Article
em En
| MEDLINE
| ID: mdl-26248225
ABSTRACT
BACKGROUND:
Many daily functional activities involve goal-directed responses based on open-loop and closed-loop motor control, yet little is known about how children with heavy prenatal alcohol exposure organize and regulate these 2 types of control systems when completing a goal-directed force response.METHODS:
Children with (n = 19) or without (n = 23) heavy prenatal alcohol exposure were required to match a target force (25 and 50% of maximum voluntary force) in a specified target time (200, 800, and 2,000 ms). Target force and produced force were visually displayed on a computer monitor. The analog force-time record was parsed into 2 segments the period beginning from force initiation to the first reversal in force was designated the open-loop phase, and the remainder of the response was the closed-loop phase.RESULTS:
Compared to controls, alcohol-exposed children produced a significantly shorter duration of open-loop control, a higher open-loop phase rate of force development, a shorter time to reach maximum force during the closed-loop phase, and greater absolute target force error. Increasing target force magnitude did not differentially alter the performance of the clinical group.CONCLUSIONS:
The results indicate that alcohol-exposed children experience deficits in completing goal-directed force responses that likely stem from an alcohol-related insult to the central nervous system. Therapeutic exercises should be designed to recalibrate internal timing systems and improve visuomotor integration.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Efeitos Tardios da Exposição Pré-Natal
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Desempenho Psicomotor
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Tempo de Reação
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Consumo de Bebidas Alcoólicas
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Objetivos
Tipo de estudo:
Diagnostic_studies
Limite:
Adolescent
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Child
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Female
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Humans
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Male
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Pregnancy
Idioma:
En
Revista:
Alcohol Clin Exp Res
Ano de publicação:
2015
Tipo de documento:
Article