Controlling AFIB and hot weather

I have had AFIB for five years. It is not persistent. Heat is a major trigger for me. I can't ignore it. This is about how I manage AFIB in hot weather while continuing to do outside activity. I hope this can help someone else live a better life while managing AFIB.

When the original event happened, I was mowing a pasture all day with a tractor and bush hog. It was mid 80's and humid. The attack began later that evening and was serious enough to go to the emergency room. After several days of tests, no specific reason was found and no heart damage was observed.

I am an outside person. Working outside and sweating is enjoyable. Since AFIB, that has had to be modified. At first I attempted to find the limits for ways to work in hot temperatures. Too many episodes. Next I limited myself to a heat index of 85F in the sun and 95F in the shade or shop. That was better but still too many events. Now I pay attention to what my body tells me. When my body says it is time to quit, I quit. Looking for a better pattern to follow, I noted that when my body tells me that it is getting too hot, it pretty well follows the wet bulb 75F temperature scale. The wet bulb seems to work because the higher the humidity, the less cooling from evaporation of perspiration.

I find this allows me to work outside for several hours every day before the temperature and humidity force me to go inside where it is cool. I look forward to the fall and winter months when high daytime temperatures are below 75F.

There are various charts which give various wet bulb scales. This is what I follow. This works for me and hopefully will be helpful for someone else.

Temperature (F°) and Humidity
for approx 75° Wet Bulb.

(°F) (%Humidity)
75 99
76 95
78 87
80 80
82 72
84 65
86 59
88 52