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Limits to human performance: elevated risks on high mountains

Raymond B. Huey1,* and Xavier Eguskitza2

1 Department of Zoology, Box 351800, University of Washington, Seattle, WA 98195-1800, USA and
2 29 Landsdowne Rise, Worcester, WR3 8LN, UK



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  		Fig. 1. Barometric pressure as a function of altitude. The left-hand ordinate plots absolute pressure in kPa and the right-hand one scales pressure as a percentage of sea-level value. The solid curve is calculated from West (West, 1998). Dashed lines connect altitudes and estimated relative barometric pressures of various localities or summits.

 


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  		Fig. 2. Temperatures at the South Col (7891m) of Everest from May 1999 to May 2000. The upper line plots measured air temperatures (data courtesy M. Hawley and the MIT Media Group). The lower line plots estimated wind chill, assuming a wind speed of 50kmh-1 (see text). The period over which successful ascents of Everest occurred in 1999 is shaded.

 




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