Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/114779
Title: Effects of Motor Task Difficulty on Postural Control Complexity during Dual Tasks in Young Adults: A Nonlinear Approach
Authors: Saraiva, Marina 
Vilas-Boas, João Paulo
Fernandes, Orlando J.
Castro, Maria António 
Keywords: motor dual task; center of pressure; approximate entropy; DFA; correlation dimension; Lyapunov exponent
Issue Date: 5-Jan-2023
Publisher: MDPI
Project: FCT grant number 2021.08571.BD 
UIDB/00285/2020 
LA/P/0112/2020 
Serial title, monograph or event: Sensors
Volume: 23
Issue: 2
Abstract: Few studies have evaluated the effect of a secondary motor task on the standing posture based on nonlinear analysis. However, it is helpful to extract information related to the complexity, stability, and adaptability to the environment of the human postural system. This study aimed to analyze the effect of two motor tasks with different difficulty levels in motor performance complexity on the static standing posture in healthy young adults. Thirty-five healthy participants (23.08 ± 3.92 years) performed a postural single task (ST: keep a quiet standing posture) and two motor dual tasks (DT). i.e., mot-DT(A)—perform the ST while performing simultaneously an easy motor task (taking a smartphone out of a bag, bringing it to the ear, and putting it back in the bag)—and mot-DT(T)—perform the ST while performing a concurrent difficult motor task (typing on the smartphone keyboard). The approximate entropy (ApEn), Lyapunov exponent (LyE), correlation dimension (CoDim), and fractal dimension (detrending fluctuation analysis, DFA) for the mediolateral (ML) and anterior-posterior (AP) center-of-pressure (CoP) displacement were measured with a force plate while performing the tasks. A significant difference was found between the two motor dual tasks in ApEn, DFA, and CoDim-AP (p < 0.05). For the ML CoP direction, all nonlinear variables in the study were significantly different (p < 0.05) between ST and mot-DT(T), showing impairment in postural control during mot-DT(T) compared to ST. Differences were found across ST and mot-DT(A) in ApEn-AP and DFA (p < 0.05). The mot-DT(T) was associated with less effectiveness in postural control, a lower number of degrees of freedom, less complexity and adaptability of the dynamic system than the postural single task and the mot-DT(A).
URI: https://hdl.handle.net/10316/114779
ISSN: 1424-8220
DOI: 10.3390/s23020628
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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