RANDY'S RIDE
Saturday, June 10, 2006
  RIDING IN SUMMER - THINGS YOU NEED TO KNOW
HEAT AND HUMIDITY- A DEADLY COMBINATION
by Terry Horan
Texas seems to be entering a summer of record high temperatures, when in combination with Austin's relatively high humidity can be fatal to unprepared motorcyclists. When the ambient air temperature in the shade is 100° F., it can be well over 120° two feet above the black asphalt of a Texas highway. Compounding the heat from the sun is a pair of cylinders and exhaust pipes radiating temperatures in excess of 500° F just inches from the rider's legs. A safety conscious motorcyclist will be wearing boots, jeans, a long sleeve shirt, gloves and a helmet that restricts the body's ability to cool down through evaporation of perspiration.
Dr. Richard A. Beauchamp, a medical consultant for the Bureau of Epidemiology at the Texas Department of Health exclaimed, "High temperatures are physically tolerated by most people for short periods of time," but some form of heat—related illness may occur when people are exposed to high temperatures and humidity that produce a heat index of 95 degrees F or higher for 30 minutes or longer. At temperatures above 90° F., a motorcycle rider traveling at 60 miles per hour can lose three quarts of water every hour. If these fluids and salts, lost through perspiration, are not rapidly and continuously replaced then dehydration and electrolyte imbalances can occur. Dehydration further impairs the body's ability to maintain the proper core temperature which could lead to heat stress, heat exhaustion, heat stroke and even death.
To prevent dehydration and hyperthermia, a motorcyclist should stop every thirty minutes to consume at least a quart of water plus prepare another quart to consume while riding between breaks. Water, milk, fruit juices, as well as many of the commercially available "sport" drinks are excellent fluid replenishes, but do not drink anything containing alcohol or caffeine as they will actually dehydrate your body. You can also reduce dehydration by wearing light colored, loose fitting clothes and drenching these clothes with cool water at each thirty-minute break. This artificial perspiration can make the body feel 20 degrees cooler and reduce the loss of body fluids. At 60 miles per hour on a 90° F day a soaked shirt and jeans will be bone dry within twenty minutes. If you own a Kool Tie or similar product, it will keep your neck and shoulders cooler and prevent sunburn on this otherwise exposed skin. If you do not own a Kool Tie, a light colored neckerchief or bandanna soaked in ice water can serve the same purpose.
If you experience nausea, dizziness, headache, fatigue, rapid pulse, shortness of breath, disorientation, cold and clammy skin or hot and dry skin, you should take immediate steps to rapidly cool down the body. The best and fastest method is to get into a tub of cool water and add ice as fast as you can stand it until you core temperature has returned to normal. If a tub is not available, a cool stream or lake will help and if that is not available simply soak your clothes with ice water from your cooler.
Refer to the official National Weather Service heat index table. To calculate heat stress, find the index number in the column under current humidity ( shown on the top line) that is directly to the right of your thermometer reading (shown in the left column)
HEAT INDEX CHART HUMIDITY---
TEMP
15
20
25
30
35
40
45
50
60
70
80
90
80°






80
82
84
85
87
89
85°
82
83
84
84
85
86
87
88
92
94
97
100
88°
84
85
87
88
90
91
93
94
97
100
106
113
90°
86
87
88
90
92
94
96
98
100
106
113
120
92°
87
89
91
93
94
96
98
100
105
111
120
128
94°
91
92
94
95
97
100
103
105
111
120
130

96°
93
95
97
98
101
104
107
109
118
128


98°
95
97
99
101
104
107
110
114
123
130+


100°
96
98
101
104
107
110
115
120
130



101°
97
100
102
105
108
112
118
123
130+



102°
98
101
104
107
110
116
121
127




103°
100
103
106
108
113
120
125
130




104°
101
104
107
110
117
123
128
130+




105°
102
105
108
112
119
126
130
130+




VERY WARM 80°-90° HOT 90°-105° VERY HOT 105°-130° EXTREMELY HOT 130°+


Tad Eubank
BexarWolf
Texas State Contact Coordinator
PGR Austin Ride Captain

*Sit tall in the saddle, hold your head up high. Keep your eyes fixed to where the trail meets the sky. Live like you ain't afraid to die. Don't be scared, just enjoy your ride*
  8:19 PM
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