Perceived Temperature For Runners Version 1

From Fellrnr.com, Running tips
Revision as of 18:56, 26 July 2011 by User:Fellrnr (User talk:Fellrnr | contribs) (moved Heat Index For Runners Version 1 to Perceived Temperature For Runners Version 1)

Jump to: navigation, search

Normal heat indexes assume a person walking outdoors at 3 mph and generating 180 watts per square meter of skin. The original work states "higher levels of activity would increase the sensitivity to humidity… few people, however, sustain activity above the level considered here for long enough to reach a steady state". This is not very helpful to runners that are moving far quicker than 3 mph and generating a lot more heat. Ideally, I'd go back to the original perceived temperature work, recreate the mathematical models and plug in different values for the heat generation for runners. Sadly, I've not found an easy way of doing that. Instead, I have taken a simple approach based on the idea that in cold weather, the perceived temperature is about 20f warmer than the actual temperature. The chart below is based on the standard perceived temperature calculation, but with 10f added to the actual temperature. The chart below is a first pass at what running at a given temperature and humidity would feel like to someone walking. So running at 76f and 80% humidity would feel like walking in 100f temperatures.

Temperature
70f 72f 74f 76f 78f 80f 82f 84f 86f 88f 90f 92f 94f 96f 98f 100f
Humidity
40% 80 81 83 85 88 91 94 97 101 105 109 114 119 124 130 136
45% 80 82 84 87 89 92 96 100 104 109 114 119 124 130 137 143
50% 81 83 85 88 91 95 99 103 108 113 118 124 131 137 144 152
55% 81 84 86 89 93 97 101 106 112 117 124 130 137 145 153
60% 82 84 88 91 95 100 105 110 116 123 129 137 145 153
65% 82 85 89 93 98 103 108 114 121 128 136 144 153
70% 83 86 90 95 100 106 112 119 126 134 143 152
75% 84 88 92 97 103 109 116 124 132 141 150
80% 84 89 94 100 106 113 121 129 138 148
85% 85 90 96 102 110 117 126 135 145
90% 86 91 98 105 113 122 131 141
95% 86 93 100 108 117 127 137
100% 87 95 103 112 121 132