To read this content please select one of the options below:

Effects of load carrying techniques on gait parameters, dynamic balance, and physiological parameters during a manual material handling task

Shahnawaz Anwer (Department of Building and Real Estate, The Hong Kong Polytechnic University, Kowloon, Hong Kong)
Heng Li (Department of Building and Real Estate, The Hong Kong Polytechnic University, Kowloon, Hong Kong)
Maxwell Fordjour Antwi-Afari (Department of Civil Engineering, College of Engineering and Physical Sciences, Aston University, Birmingham, UK)
Waleed Umer (Department of Construction Engineering and Management, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia)
Imran Mehmood (Department of Building and Real Estate, The Hong Kong Polytechnic University, Kowloon, Hong Kong)
Arnold Yu Lok Wong (Department of Rehabilitation Sciences, Faculty of Health and Social Sciences, Hong Kong Polytechnic University, Kowloon, Hong Kong)

Engineering, Construction and Architectural Management

ISSN: 0969-9988

Article publication date: 27 July 2021

Issue publication date: 24 November 2022

465

Abstract

Purpose

Since construction workers often need to carry various types of loads in their daily routine, they are at risk of sustaining musculoskeletal injuries. Additionally, carrying a load during walking may disturb their walking balance and lead to fall injuries among construction workers. Different load carrying techniques may also cause different extents of physical exertion. Therefore, the purpose of this paper is to examine the effects of different load-carrying techniques on gait parameters, dynamic balance, and physiological parameters in asymptomatic individuals on both stable and unstable surfaces.

Design/methodology/approach

Fifteen asymptomatic male participants (mean age: 31.5 ± 2.6 years) walked along an 8-m walkway on flat and foam surfaces with and without a load thrice using three different techniques (e.g. load carriage on the head, on the dominant shoulder, and in both hands). Temporal gait parameters (e.g. gait speed, cadence, and double support time), gait symmetry (e.g. step time, stance time, and swing time symmetry), and dynamic balance parameters [e.g. anteroposterior and mediolateral center of pressure (CoP) displacement, and CoP velocity] were evaluated. Additionally, the heart rate (HR) and electrodermal activity (EDA) was assessed to estimate physiological parameters.

Findings

The gait speed was significantly higher when the load was carried in both hands compared to other techniques (Hand load, 1.02 ms vs Head load, 0.82 ms vs Shoulder load, 0.78 ms). Stride frequency was significantly decreased during load carrying on the head than the load in both hands (46.5 vs 51.7 strides/m). Step, stance, and swing time symmetry were significantly poorer during load carrying on the shoulder than the load in both hands (Step time symmetry ration, 1.10 vs 1.04; Stance time symmetry ratio, 1.11 vs 1.05; Swing time symmetry ratio, 1.11 vs 1.04). The anteroposterior (Shoulder load, 17.47 mm vs Head load, 21.10 mm vs Hand load, −5.10 mm) and mediolateral CoP displacements (Shoulder load, −0.57 mm vs Head load, −1.53 mm vs Hand load, −3.37 ms) significantly increased during load carrying on the shoulder or head compared to a load in both hands. The HR (Head load, 85.2 beats/m vs Shoulder load, 77.5 beats/m vs No load, 69.5 beats/m) and EDA (Hand load, 14.0 µS vs Head load, 14.3 µS vs Shoulder load, 14.1 µS vs No load, 9.0 µS) were significantly larger during load carrying than no load.

Research limitations/implications

The findings suggest that carrying loads in both hands yields better gait symmetry and dynamic balance than carrying loads on the dominant shoulder or head. Construction managers/instructors should recommend construction workers to carry loads in both hands to improve their gait symmetry and dynamic balance and to lower their risk of falls.

Practical implications

The potential changes in gait and balance parameters during various load carrying methods will aid the assessment of fall risk in construction workers during loaded walking. Wearable insole sensors that monitor gait and balance in real-time would enable safety managers to identify workers who are at risk of falling during load carriage due to various reasons (e.g. physical exertion, improper carrying techniques, fatigue). Such technology can also empower them to take the necessary steps to prevent falls.

Originality/value

This is the first study to use wearable insole sensors and a photoplethysmography device to assess the impacts of various load carrying approaches on gait parameters, dynamic balance, and physiological measures (i.e. HR and EDA) while walking on stable and unstable terrains.

Keywords

Acknowledgements

The authors acknowledged the following two funding grants: (1) General Research Fund (GRF) Grant (BRE/PolyU 152047/19E) entitled “In Search of a Suitable Tool for Proactive Physical Fatigue Assessment: An Invasive to Non-invasive Approach”; and (2) General Research Fund (GRF) Grant (BRE/PolyU 15210720) entitled “The development and validation of a noninvasive tool to monitor mental and physical stress in construction workers”.

Citation

Anwer, S., Li, H., Antwi-Afari, M.F., Umer, W., Mehmood, I. and Wong, A.Y.L. (2022), "Effects of load carrying techniques on gait parameters, dynamic balance, and physiological parameters during a manual material handling task", Engineering, Construction and Architectural Management, Vol. 29 No. 9, pp. 3415-3438. https://doi.org/10.1108/ECAM-03-2021-0245

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

Related articles