A comparison of mountain rescue casualty bags in a cold, windy environment.
OBJECTIVE
To help the Mountain Rescue Association of Scotland find the best protective mountain rescue casualty bag in cold and windy conditions. The study investigated how 3 different casualty bags (labeled Bag 1, Bag 2, and Bag 3) performed in a cold (-10 degrees C, dry bulb), windy (wind speed 3.0 m x s(-1)) environment using physiological and subjective responses of the participating subjects.


METHODS
Eleven male subjects, aged 23.4+/-4 years, percentage body fat 15.5+/-2 (mean +/- SD). Each participated in a total of 3 tests (1 for each bag). The tests were scheduled to last 60 minutes. Core and skin temperatures (skin values were measured on the arm, chest, thigh, and calf, and a mean skin temperature was calculated) were measured during the tests. Heart rate, oxygen consumption (Vo2), and subjective cold perception ratings were also recorded at regular intervals throughout the test duration. All variables except for Vo2 and cold discomfort were adjusted for baseline.


RESULTS
There was a significant difference in the mean response between the bags for the following variables: arm, chest, thigh, calf, mean temperature, and cold discomfort.


CONCLUSIONS
All 3 bags showed limited ability to protect the subjects in cold, windy conditions. However, the study shows that Bag 2 offered the least protection against the imposed environment. It is difficult to differentiate between the other 2 bags, because Bag 1 performed better than Bag 3 for arm, calf, and mean temperatures, while Bag 3 outperformed Bag 1 for chest and thigh temperatures and cold discomfort scores.
Grant
Stanley J
SJ
Institute of Biomedical and Life Sciences, University of Glasgow, UK. s.grant@bio.gla.ac.uk
Dowsett
David
D
Hutchison
Colin
C
Newell
John
J
Connor
Tracy
T
Grant
Pat
P
Watt
Martin
M
D000328:Adult; D000531:Altitude; D001833:Body Temperature Regulation / Q000502:physiology*; D003080:Cold Temperature; D004638:Emergency Treatment / Q000295:instrumentation*; D004867:Equipment Design; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007035:Hypothermia / Q000517:prevention & control*; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D011481:Protective Clothing / Q000592:standards*; D012606:Scotland; D012881:Skin Temperature / Q000502:physiology; D014919:Wind