Identifying and Characterizing Types of Balance Recovery Strategies Among Females and Males to Prevent Injuries in Free-Standing Public Transport Passengers
Journal article, 2021

Free-standing passengers on public transport are subjected to perturbations during non-collision incidents caused by driver maneuvers, increasing the risk of injury. In the literature, the step strategy is described as a recovery strategy during severe perturbations. However, stepping strategies increase body displacement, ultimately subjecting passengers to higher risk of impacts and falls on public transport. This study investigates the influence of different recovery strategies on the outcome of balance recovery of free-standing public transport passengers, challenged in postural balance by the non-uniform vehicle dynamics. From high-speed video recordings, a qualitative investigation of the balance responses of volunteer participants in a laboratory experiment was provided. On a linearly moving platform, 24 healthy volunteers (11 females and 13 males) were subjected to perturbation profiles of different magnitude, shape and direction, mimicking the typical acceleration and deceleration behavior of a bus. A methodology categorizing the balancing reaction to an initial strategy and a recovery strategy, was used to qualitatively identify, characterize and, evaluate the different balance strategies. The effectiveness of different strategies was assessed with a grading criterion. Statistical analysis based on these ordinal data was provided. The results show that the current definition in the literature of the step strategy is too primitive to describe the different identified recovery strategies. In the volunteers with the most successful balancing outcome, a particularly effective balance recovery strategy not yet described in the literature was identified, labeled the fighting stance. High jerk perturbations seemed to induce faster and more successful balance recovery, mainly for those adopting the fighting stance, compared to the high acceleration and braking perturbation profiles. Compared to the pure step strategy, the characteristics of the fighting stance seem to increase the ability to withstand higher perturbations by increasing postural stability to limit body displacement.

balance recovery

free-standing passengers

step strategy

balance strategy

perturbation

human balance

public transport

Author

Jia Cheng Xu

The Swedish National Road and Transport Research Institute (VTI)

Ary P. Silvano

The Swedish National Road and Transport Research Institute (VTI)

Arne Keller

AGU Zurich

Simon Krašna

University of Ljubljana

Robert Thomson

Chalmers, Mechanics and Maritime Sciences, Vehicle Safety, Injury Prevention

Corina Klug

Technische Universität Graz

Astrid Linder

Chalmers, Mechanics and Maritime Sciences, Vehicle Safety

The Swedish National Road and Transport Research Institute (VTI)

Frontiers in Bioengineering and Biotechnology

2296-4185 (ISSN)

Vol. 9 670498

Areas of Advance

Transport

Subject Categories

Transport Systems and Logistics

Vehicle Engineering

Clinical Science

DOI

10.3389/fbioe.2021.670498

PubMed

34291040

More information

Latest update

8/24/2021