"Float first and kick for your life": Psychophysiological basis for safety behaviour on accidental short-term cold water immersion

Barwood, Martin, Burrows, Holly, Cessford, Jess and Goodall, Stuart (2015) "Float first and kick for your life": Psychophysiological basis for safety behaviour on accidental short-term cold water immersion. Physiology & Behavior, 154. pp. 83-89.

[img]
Preview
Text (Article)
PHB-D-15-00659R1(blank).pdf - Accepted Version

Download (125kB) | Preview
Official URL: http://dx.doi.org/10.1016/j.physbeh.2015.11.017

Abstract

INTRODUCTION

Accidental cold-water immersion (CWI) evokes the life threatening cold shock response (CSR) which increases the risk of drowning. Consequently, the safety behaviour selected is critical in determining survival; the present advice is to 'float first' and remain stationary (i.e. rest). We examined whether leg only exercise (i.e., treading water; 'CWI-Kick') immediately on CWI could reduce the symptoms of the CSR, offset the reduction in cerebral blood flow that is known to occur and reduce the CSR's symptoms of breathlessness. We also examined whether perceptual responses instinctive to accidental CWI were exacerbated by this alternative behaviour. We contrasted CWI-Kick to a 'CWI-Rest' condition and a thermoneutral control (35°C); 'TN-Rest'.

METHOD

Seventeen participants were tested (9 males, 8 females). All immersions were standardised; water temperature in cold conditions (i.e., 12°C) was matched ±/0.5°C within participant. Middle cerebral artery blood flow velocity (MCAv) and cardiorespiratory responses were measured along with thermal perception (sensation and comfort) and dyspnoea. Data were analysed using repeated measures ANOVA (alpha level of 0.05).

RESULTS

MCAv was significantly reduced in CWI-Rest (-6 (9)%; 1st minute of immersion) but was offset by leg only exercise immediately on cold water entry; CWI-Kick MCAv was never different to TN-Rest (-3 (16)% cf. 5 (4)%). All CWI cardiorespiratory and perceptual responses were different to TN-Rest but were not exacerbated by leg only exercise.

DISCUSSION

Treading water may aid survival by offsetting the reduction in brain blood flow velocity without changing the instinctive behavioural response (i.e. perceptions). "Float first - and kick for your life" would be a suitable amendment to the water safety advice.

Item Type: Article
Additional Information: published online first.
Uncontrolled Keywords: thermal perception, treading water, water safety
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Nicola King
Date Deposited: 09 Dec 2015 11:52
Last Modified: 30 Oct 2017 02:56
URI: http://nrl.northumbria.ac.uk/id/eprint/24950

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence