Studies investigating the effect of concurrent feedback reported inconsistent results, especially on motor tasks with different difficulties. There is also lack of studies examining the effects of concurrent feedback on postural tasks with different difficulties. To fill this gap, this study investigated the effect of concurrent visual feedback (CVF) and postural task difficulty (PTD) on postural control in acquisition and retention phases. Participants were 40 university students who were randomly allocated to experimental and control groups based on time of arrival and gender. Participants performed six postural tasks with varying difficulties in one day. Each task was repeated three times for 60 seconds. Instantaneous center of pressure (CoP) location was provided to the experimental group as the source of CVF in acquisition phase, but it was withdrawn in retention phase (24 hours in between). Participants in control group performed same tasks without any feedback in both phases. The assessment parameters were velocity (AP-ML-RD), variability (AP-ML-RD), range (AP- ML-RD), ellipse area, and regularity (i.e., approximate entropy) of CoP trajectory. Acquisition phase results showed that feedback had a significant effect on variability in the AP and RD directions, ellipse area, and entropy parameters. Retention phase results showed that CVF did not affected any assessed parameters. PTD has been found to be effective for both acquisition and retention phases. This study indicated that CVF improved variability, ellipse area, and entropy parameters. CVF might increase adaptation to specific contexts and augment sensory integration by preventing cognitive overload and affect postural sway parameters positively. However, limited number of trials and sessions with CVF might be reason for the lack of retention effect.


Effect of individualized cognitive and postural task difficulty levels on postural control during dual task condition
Gursoy, Zeren G.; Yilmaz, Ugur; ÇELİK, HÜSEYİN; Arpinar-Avsar, Pinar; Kirazcı, Sadettin (2022-07-01)
© 2022 Elsevier B.V.Background: Previous dual task studies suggested that the difficulty of the concurrent cognitive and motor tasks may not be challenging to the same degree for each person. This study approaches this problem by setting individualized difficulty levels for tasks to examine the dual task interference. Research question: Do the features of postural sway depend on increased individualized difficulty levels of concurrent cognitive and postural activities? Methods: 20 young healthy participants...
The Combined Effect of Light Touch and Cognitive Task Difficulty on Postural Control
çelik, tuğba; Kirazcı, Sadettin; Department of Physical Education and Sports (2021-10-12)
Studies investigating combined effects of light touch and cognitive task are limited and available results are inconsistent regarding effects of cognitive task on postural control. Therefore, this study investigated the combined effects of light touch and cognitive task difficulty on postural control. Participants performed cognitive task and light touch individually and simultaneously. Results indicated that both light touch and cognitive task improved postural sway individually. The cognitive task difficu...
Effects of primary task predictability and secondary task modality on lane maintenance
Özbozdağlı, Seda; Mısırlısoy, Mine; Özkan, Türker; Atalay, Nart Bedin (Elsevier BV, 2018-8)
The objective of this work was to investigate the effects of auditory and visuo-spatial secondary tasks on variability in lane position in predictable and unpredictable driving conditions. Sixty-six participants drove a simulated vehicle. Predictability was manipulated by adding wind gusts, and the secondary task load by either an auditory task (Experiment 1) or a visuo-spatial task (Experiment 2). Results demonstrated that in the predictable driving condition, lane position variability decreased when audit...
Eş zamanlı gerçekleştirilen bilişsel ve motor görevin postür kontrolü üzerine etkisi
Babajimopoulos, Zeren; Yılmaz, Uğur; Arpınar Avşar, Pınar; Kirazcı, Sadettin (2018-11-03)
Amaç:Bu çalışmanın amacı farklı zorlukta postural motor görev sırasında eş zamanlı olarak gerçekleştirilen bilişsel görevin postür kontrolü üzerine etkisinin incelenmesidir. Yöntem:19 gönüllü katılımcı (yaş:23±6 yıl, boy:171.7± cm, v.ağırlığı:71.1± kg) 1 dk boyunca üç farklı zorluk düzeyinde bilişsel görev altında, kuvvet platformu üzerinde ayakta sakin duruş (QS) ve istemli postural salınım (VS) hareketi yapmaları istenmiştir. Bilişsel görev işitsel olarak kendilerine ardışık olarak sunulan basit aritmetik...
Effect of high hydrostatic pressure processing and squeezing pressure on some quality properties of pomegranate juice against thermal treatment
Subasi, B. G.; Alpas, Hami (2017-03-01)
The aim of this study was to investigate the effect of high hydrostatic pressure (HHP) treatment (200, 300, 400MPa; 5 degrees C, 15 degrees C and 25 degrees C; 5 and 10 min) on some quality properties of pomegranate juice. Juice samples are obtained under industrial conditions at two different squeezing pressure levels (100 and 150psi - 0.689 and 1.033MPa, respectively). Results are compared against conventional thermal treatment (85 degrees C/10 min) and raw sample. For all three processing temperature, HH...
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