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The effect of fear of falling on prefrontal cortex activation and efficiency during walking in older adults

  • Roee HoltzerEmail author
  • Rebecca Kraut
  • Meltem Izzetoglu
  • Kenny Ye
Original Article
  • 5 Downloads

Abstract

Neural inefficiency is inferred when higher brain activations are associated with similar or worse performance. Improved neural efficiency is achieved when task-related brain activations are reduced after practice. No information is available on the effect of fear-of-falling (FOF) on brain activation during walking. We hypothesized that the presence of FOF would be associated with neural inefficiency and with a delay in improving neural efficiency during dual-task walking. Task conditions included single-task walk (STW), Alpha (cognitive interference), and dual-task walk (DTW). Functional near-infrared spectroscopy (fNIRS)-derived HbO2 in the prefrontal cortex (PFC) was used to quantify task-related changes in brain activation. Practice included three repeated counterbalanced trials for each task. Participants with FOF (n = 19; mean age = 79.84 ± 6.01 years; %female = 68.42) and without FOF (n = 56; mean age = 76.73 ± 6.39 years; %female = 44.64) were included. The presence of FOF was associated with slower stride velocity (estimate = − 12.354; p = 0.0154) and with greater increases in PFC HbO2 from STW to DTW (estimate = 0.303, p = 0.0009) and from Alpha to DTW (estimate = 0.387, p < 0.0001). Compared to controls, participants reporting FOF demonstrated an attenuated decline in PFC HbO2 from the first to the second DTW trials (estimate = 0.264; p = 0.0173). In contrast, compared to controls, participants with FOF demonstrated greater decline in Alpha PFC HbO2 from trial 1 to trial 2 (estimate = − 0.419, p < 0.0001) and from trial 1 to 3 (estimate = − 0.281, p = 0.0006). The change in PFC HbO2 over repeated STW trials was not significant and was not moderated by FOF status. The presence of FOF was associated with higher and inefficient PFC activation during DTW in older adults.

Keywords

Fear-of-falling Dual-task walking Prefrontal cortex, neural efficiency, functional-near-infrared spectroscopy 

Notes

Funding information

This research was supported by the National Institutes on Aging grants (R01AG036921, R01AG044007).

Compliance with ethical standards

The study was in compliance with the Code of Ethics of the World Medical Association (Declaration of Helsinki). Participants signed written informed consents in the first in-person study visit. The Institutional Review Board approved this study.

Conflicts of interest

Dr. Izzetoglu has a very minor share in the company that manufactures the fNIRS device used in this study. All other authors have no conflicts of interest to report in relation to the current article.

Supplementary material

11357_2019_56_MOESM1_ESM.docx (28 kb)
ESM 1 (DOCX 28 kb)

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Copyright information

© American Aging Association 2019

Authors and Affiliations

  1. 1.Albert Einstein College of Medicine BronxBronxUSA
  2. 2.Yeshiva University BronxNew YorkUSA
  3. 3.Villanova University Electrical and Computer EngineeringVillanovaUSA

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