Heat stress is a continuum with heat cramps being on one side and heat stroke on the other. Heat stroke is the most severe form of heat injury with alteration in mentation being a key feature of this ailment. It is unlikely that the flushing you were experiencing is secondary to Heat stroke.
The flushing you're describing can be attributed to several different factors, but the most likely are either a physiologic compensatory response to heat, or early heat exhaustion. While doing this type of physical activity it is very important to stay hydrated.
The Wet Globe Temperature Index has been used to identify hydration requirements for individuals participating in activities in warm environments. A description of this Index can be found at
Wet Globe Index .
Below are some descriptors for the Wet Globe Temperature Index....
Heat Category 1 78-81.9° Fahrenheit
Drink at least ½ quart of water per hour
Continuous activity allowed
Heat Category 2 82-84.9 ° Fahrenheit
Drink at least ½ quart of water per hour
40 minutes of work/20 minutes of rest (civilian)
50 minutes of work/10 minutes of rest (military)
Heat Category 3 85-87.9 ° Fahrenheit
Drink at least 1 quart of water per hour
30 minutes of work/30 minutes of rest (civilian)
45 minutes of work/15 minutes of rest (military)
Heat Category 4 88-89.9 ° Fahrenheit
Drink at 1.5 quarts of water per hour
20 minutes of work/40 minutes of rest (civilian)
30 minutes of work/30 minutes of rest (military)
Heat Category 5 >90 ° Fahrenheit
Drinnk more than 2 quarts of water per hour
10 minutes of work/50 minutes of rest (civilian)
20 minutes of work/40 minutes of rest (military)
Wearing body armor or MOPP gear raises all heat conditions to Category 5
When deploying, always assume 4 gallons water/per person/per day (for logistics purposes).
Wook