Ageing Effects on Dual-Tasking Performance that Involved Turning-While-Walking

Research Article

Ann Nurs Res Pract. 2021; 6(1): 1040.

# Ageing Effects on Dual-Tasking Performance that Involved Turning-While-Walking

Chan Wing-nga, PhD1,2, Chan Eva YW, MSc1, Schoeb Veronika, PhD3 and Tsang William WN, PhD1,2*

¹Department of Physiotherapy, School of Nursing and Health Studies, The Open University of Hong Kong, Hong Kong SAR, China

²Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong SAR, China

³School of Health Sciences (HESAV), University of Applied Sciences and Arts Western Switzerland (HESSO), Lausanne, Switzerland

*Corresponding author: William WN Tsang, Department of Physiotherapy, School of Nursing and Health Studies, The Open University of Hong Kong, Room F1233, 12/F, Block F, Hong Kong SAR, China; Department of Physiotherapy, The Open University of Hong Kong, Homantin, Kowloon, Hong Kong SAR, China

Received: June 28, 2021; Accepted: July 27, 2021; Published: August 03, 2021

## Abstract

Keywords: Ageing; Young-old; Dual-tasking; Auditory Stroop test; Turningwhile- walking

## Introduction

Turning-while-walking is one of the most common activities that causes a fall in community-dwelling older adults. A fall during turning is associated with recurrent falls. It is 7.9 times more likely to cause a hip fracture when compared with a fall during straight-line walking [1], and contributes to early mortality in older adults [2].

While straight-line walking is considered an automatic action, turning demands cognitive processing [3]. Before the turn, the body judges and coordinates different segments via its feedforward system to perform a safe and efficient turn. During the turn, feedback system acts to monitor and adjust the movement continuously [4,5]. Compared with healthy young adults, older people demonstrated a deviated reorientation sequence of body segments, increased time to turn, and the number of turning steps [5]. These factors determine turning performance, which relates to functional ability [6].

Dual-tasking is defined as performing two different tasks simultaneously. Dual-tasking is common in daily life. For example, talking while walking, or crossing the road while keeping an eye for the traffic signal. The theory of competition for attentional resources explains the ability of an individual to dual-task. When the available resources are insufficient for a person to perform two tasks concurrently, there will be a decline in the performance in either or both tasks [7,8]. Several factors were suggested to contribute to the ageing effects on dual-tasking ability [7]:

• Increased attentional demand to perform individual physical and cognitive tasks.

• Decreased availability of attentional resources to dual-task.

• Compromised ability to shift attentional resources between the two tasks.

• Combinations of these factors.

There have been numerous studies suggesting a decrement in dual-tasking ability among older adults. Dual-tasking ability has also been negatively related to falls in older adults [9,10].

## Participants

In this cross-sectional study, community-dwelling young-old adults were recruited by conventional sampling, while young adults were recruited at local universities. Inclusion criteria were as follows: 1) able to walk unaided, 2) independent in activities of daily living, and 3) native Cantonese speakers (as required for the auditory Stroop test), 4) 65-74 years of age for the young-old adult group, and 5) 19- 24 years of age for the young adult group. Exclusion criteria were as follows: 1) diagnosed with neurological disorders, 2) suffering from any musculoskeletal injuries in the lower limbs during the last 12 months, 3) cognitively impaired as defined by a score of less than 24 in the Mini-Metal State Examination (Cantonese version), and 4) had hearing impairments. Ethical approval of the study was obtained from the Ethics Committee of The Hong Kong Polytechnic University. After a standardized explanation of the aim and procedures, written informed consents were obtained from all participants.

## Assessment

Demographic data including age, height and weight were collected. All subjects performed three tests: 1) auditory Stroop test (single cognitive task), 2) turning-while-walking test (single physical task), and 3) a combination of the two tests (dual-tasking). The sequence of the three tests was randomized for each subject.

## Auditory stroop test (Single Cognitive Task)

For this test [13], two Cantonese words, “low” or “high”, were recorded with a low-pitch and a high-pitched voice. There were four combinations of auditory cues. Subjects were asked to press a twobutton switch according to the pitch of the auditory cue, disregarding the meaning of the pronounced word. The subject should respond to the audios as quickly and as accurately as possible. The test was conducted in a quiet environment with the subject seated. The test began with four audios as practice trials, followed by twelve testing audios as data-taking trials. Outcome measures were the average reaction time of the twelve trials, and the error rate as calculated by

$\textrm{Error&space;rate}=\frac{(Number&space;of&space;wrong&space;trials)}{(Number&space;of&space;trials&space;conducted)}\times&space;100$

## Turning-while-walking test (Single Physical Task)

Subjects wore six gyroscopic sensors (Mobility Lab iWalk, OPAL sensors, APDM Inc., Portland, OR) over their four limbs, waist, and chest. Each subject walked a 5-meter straight path, turned 180o, and walked straight back to the starting point at their quickest and most stable manner. After familiarization, each subject performed six trials, with three trials turning to each side. Subjects were provided with the two-button switch used in the auditory Stroop test, and were instructed to press any button during turning to eliminate the motor effect of this action on physical performance when compared with the dual-tasking condition. Outcome measures were the completion time of the whole task, the turning duration, and the number of turning steps.

Dual-tasking performance was assessed with a concurrent auditory Stroop test and turning-while-walking test. The auditory cues were triggered by a force platform (Model OR6-5-1000, Advanced Mechanical Technologies Inc., Newton, MA, USA) embedded on the floor where the subjects started turning. A practice trial was performed for familiarization. A total of eight trials were conducted, with four trials turning to each side. Prioritization of the task was not stated. Outcome measures were those adopted in the single cognitive and single physical tests. This test has been assessed for its reliability [14].

## Statistical analysis

Statistical analyses were carried out with the Statistical Package for the Social Sciences (SPSS) (version 20.0, IBM Corp., Armonk, NY, USA). Independent t-tests were conducted to compare the continuous demographic characteristics between the two groups. A chi-square test was employed to compare the sex distribution between the two groups. Two-way mixed ANOVA (group x task) was conducted for each outcome measure to determine the significance of the group effect, task effect, and interaction effect. For any significant task effect revealed, paired t-tests were conducted to compare the single-tasking and dual-tasking conditions in each group. If a significant group effect was found, follow-up between-group differences were compared with independent t-tests in each tasking condition. Bonferroni adjustments were made for every follow-up analysis. The statistical significance level was set at 0.05.

## Participants

Ten young and eleven young-old adults participated in this study. Demographic data of the two groups are shown in Table 1. There was a significant difference in the average height of the two groups, with the younger group being taller, but not in other parameters.

Citation: Wing-Nga C, Chan Eva YW, Veronika S and Tsang William WN. Ageing Effects on Dual-Tasking Performance that Involved Turning-While-Walking. Ann Nurs Res Pract. 2021; 6(1): 1040.