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Physiological demands of mountain rescue work
  1. Nigel Callender1,
  2. John Ellerton2,
  3. Jamie Hugo Macdonald3
  1. 1Newcastle Medical School, Newcastle-Upon-Tyne, UK
  2. 2Mountain Resuce (England and Wales), Penrith, UK
  3. 3Extremes Research Group, Bangor University, Bangor, UK
  1. Correspondence to Dr Jamie Hugo Macdonald, Extremes Research Group, School of Sport, Health and Exercise Sciences, Bangor University, George Building, Bangor, Gwynedd LL57 2PZ, UK; j.h.macdonald{at}bangor.ac.uk

Abstract

Objective To characterise the physical fitness of mountain rescue (MR) volunteers and the physical demands of a typical MR callout.

Methods Eight MR volunteers (age ± SD: 45.5 ± 8.9 years) completed a laboratory-based treadmill exercise test to exhaustion. One week later subjects completed a field-based simulated callout to retrieve a casualty by stretcher. In both studies exercise intensity was evaluated by determination of oxygen uptake and other cardiovascular measures.

Results The maximal oxygen uptake of the participants was 53 ml/kg/min (95% CI 45 to 60). In an unassisted callout, a typical rucksack load was 17% of body mass. Ascent time was 56 min (95% CI 40 to 72), of which 82% (95% CI 66% to 98%) was completed at hard or very hard intensity (above the respiratory compensation point). Descent time with a stretcher was 58 min (95% CI 52 to 64), of which only 6% (95% CI −4% to 16%) was completed at hard or very hard intensity. Correlations between heart rate and oxygen uptake were similar (p=0.254 by analysis of variance) during laboratory (r=0.72) and field testing, especially for the ascent (r=0.75).

Conclusions Mountain rescuers generally have high levels of physical fitness and are required to perform at very hard intensity for the majority of the ascent to a casualty. Heart rate is a simple yet valid measure of exercise intensity in MR personnel. These findings highlight important information on the unique physical demands faced by MR volunteers and provide direction for future research, volunteer selection and training.

  • Emergency medical services
  • heart rate/physiology
  • metabolic demand
  • oxygen uptake
  • rescue work
  • mountain rescue
  • environmental medicine
  • expedition medicine

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Footnotes

  • Funding This study received funding from Mountain Rescue (England and Wales) to pay for the consumables.

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval Ethics approval was provided by the School of Sport, Health and Exercise Sciences, Bangor University Ethics Committee.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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