Saraiva Marina, Fernandes Orlando J, Vilas-Boas João Paulo, Castro Maria António
RoboCorp Laboratory, i2A, Polytechnic Institute of Coimbra, 3046-854 Coimbra, Portugal.
Faculty of Sports and CIAFEL, University of Porto, 4200-450 Porto, Portugal.
Eur J Investig Health Psychol Educ. 2022 Aug 9;12(8):1021-1033. doi: 10.3390/ejihpe12080073.
Analysis of the center of pressure (CoP) during cognitive or motor dual-tasking is widely used to characterize postural control. Most studies use traditional measures of CoP to quantify postural control, but given its complexity, nonlinear analysis of CoP is of growing interest in the area. This study aims to analyze CoP behavior in healthy young adults during standing posture performance while simultaneously performing motor or cognitive tasks on a smartphone, using linear and nonlinear analysis of CoP. Thirty-six healthy participants (23.08 ± 3.92 years) were found eligible for this study. They performed a single task (ST), cognitive dual-task (cog-DT), and motor dual-task (mot-DT). The total excursion of CoP, displacement of CoP in the anterior-posterior and medial-lateral directions, mean total velocity of CoP, and mean anterior-posterior and medial-lateral velocities of CoP were measured with a force plate. Approximate entropy (ApEn) of the anterior-posterior (ApEn-AP) and medial-lateral (ApEn-ML) displacement of CoP were also calculated. The results showed that dual-task costs for the total excursion, displacement in the anterior-posterior direction, mean total velocity, and mean anterior-posterior velocity of CoP were greater during the cog-DT than the mot-DT (p < 0.05). In the nonlinear analysis of the CoP, there was no difference (p > 0.05) between the cog-DT and mot-DT for ApEn values of the anterior-posterior and medial-lateral time series of the CoP. Both linear and nonlinear analyses showed differences between the cog-DT and ST (p < 0.05), revealing a decline in postural control during the cog-DT compared with the ST. In conclusion, performing a cog-DT causes sway impairments and lower postural control efficacy compared with motor single and dual-tasks. Furthermore, both linear and nonlinear analyses were able to distinguish between conditions.
在认知或运动双重任务期间对压力中心（CoP）进行分析，被广泛用于表征姿势控制。大多数研究使用CoP的传统测量方法来量化姿势控制，但鉴于其复杂性，CoP的非线性分析在该领域越来越受到关注。本研究旨在通过对CoP进行线性和非线性分析，来分析健康年轻成年人在站立姿势表现期间同时在智能手机上执行运动或认知任务时的CoP行为。三十六名健康参与者（23.08 ± 3.92岁）被认定符合本研究条件。他们执行了单一任务（ST）、认知双重任务（cog-DT）和运动双重任务（mot-DT）。使用测力板测量CoP的总偏移、CoP在前后和内外方向上的位移、CoP的平均总速度以及CoP的平均前后和内外速度。还计算了CoP前后位移（ApEn-AP）和内外位移（ApEn-ML）的近似熵（ApEn）。结果表明，在cog-DT期间，CoP的总偏移、前后方向位移、平均总速度和平均前后速度的双重任务成本高于mot-DT（p < 0.05）。在CoP的非线性分析中，CoP前后和内外时间序列的ApEn值在cog-DT和mot-DT之间没有差异（p > 0.05）。线性和非线性分析均显示cog-DT和ST之间存在差异（p < 0.05），表明与ST相比，cog-DT期间姿势控制有所下降。总之，与运动单一任务和双重任务相比，执行cog-DT会导致摇摆障碍和更低的姿势控制效能。此外，线性和非线性分析都能够区分不同条件。
