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Possibly had heat exhaustion today??? Not sure

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Possibly had heat exhaustion today??? Not sure

Old 09-05-09, 02:44 PM
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Stevestrat
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Possibly had heat exhaustion today??? Not sure

So, I was on a group ride today & couldnt finish. Started feeling bad after about 12 miles. By 25, I had to pull over. The route is shorter & easier than what I normally do alone. The pace was close to 18 & I normally do about 15 alone or with one other person. Most Saturdays I ride 40- 50 miles. This ride was 30.Had a bagel & coffee for breakfast. Very little water. Thinking maybe not enough water before I left & not enough while on the bike. This is the 1st time anything like this has ever happened to me. Got real tired, hot, dizzy. Almost fainted after getting off my bike...just trying to nail this down so it doesnt happen again...any ideas are appreciated!.....Thx- Steve
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Old 09-06-09, 06:42 AM
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Well 12 miles is awfully fast to get heat exhaustion onset. I suppose you could get it in 25 miles on a hot day and if you were not drinking anything much.

Your symptoms sound like heat exhaustion. On a personal note, did you urinate less than normal after the ride? Was your urine strongly colored? Did you drink quite a bit before your urinary excretion turned back to normal? Heat exhaustion is really dehydration whilst exercising. The symptoms I mentioned are all associated with dehydration.

Try to be pretty "topped off" with water before you start a ride and drink frequently during the ride.
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Old 09-06-09, 11:06 AM
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Don't recall if I urinated less when got back. I was dizzy & still had blurry vision when I got home. Still very tired. Rested for an hour before I felt like taking a shower. Then rested about the entire day. Feel good today & want to ride same route tomorrow. Don't plan on riding today. I even wondered about low blood sugar, but I ate a cliff bar & drank gatorade while riding- would that eliminate low blood sugar as a possible cause??.....a friend I was riding with said that if I did not have headache then hydration was not the issue...is this correct?? I gotta tell you, it was pretty scary because I have never experieced this before. It was also very humbling....Thx- Steve
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Old 09-06-09, 05:24 PM
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Two thoughts:

First, it could be that you went too hard. 18 vs 15 is a significant difference in the amount of energy you took in, and if you feel like you were working really hard, it could be that.

Second, it could be that you're a bit sick. It sometimes happen that you're not sick enough to really notice anything until you get out on the bike.

It's pretty unlikely to be low blood sugar. When you bonk, you go from okay to really bad quickly, not over a period of miles, and it's pretty hard to get that way in 12 miles.

My guess is that you were a bit sick and went a bit too hard.
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Old 09-06-09, 07:08 PM
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Thanks for the input guys....I am riding in the morning....if I can find some campany, I am going to ride same route (safer on this route w/others). If not, I'll go another route alone & see how it goes. I have been drinking water all day & will have plenty in AM & little more to eat.....I'll let you know when I get back!....Thx- Steve
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Old 09-07-09, 01:31 PM
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Felt way better on the bike today. Went 50 miles alone. Avg speed was 14.2, but was fairly windy. Felt better at 48 miles than I did couple days ago at 15. Pretty wierd. Had a bigger supper last PM, drank water all day yesterday & had more for breakfast this AM. Also drank more water this morning before the ride & drank more during the ride. Also started at about 9:00 am vs 8:00 am couple days ago... still not sure what happened- think it may have been combination of things...thanks for the input.....Steve
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Old 09-07-09, 02:54 PM
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Was it unusually warm that day compared to most days you ride? Sorry, it sounds stupid to ask... but you mention nothing about the temperature that day. If the temps were within your normal riding range it sounds more like a bonk given the lack of breakfast and water.

I've had three instances of heat exhaustion and now know what to look for. Have to watch for it when temps get above 95F or so. With me, it starts with unusual fatigue and muscle pain, followed by shortness of breath and nausea (I never get nauseous, so that's a real clue). Almost passed out the first time when I just kept on riding for awhile; now I'm smarter and stop before it gets that bad.
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Old 09-07-09, 06:14 PM
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Not real hot, but the sun was right on us & it felt like it was beating down on me...but really not that hot. Actually probably only a high at the time of low 80's.
- Steve
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Old 09-08-09, 08:32 PM
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Probably dehydrated somewhat. Good lesson to remind you to drink a glass or 2 of water before taking off. Also have to drink replacement fluids when riding especially when it's hot. You won't notice the sweat obviously, because it dries instantly due to the constant wind while riding.

The blurred vision happened to me after my first ride or 2 when I took up cycling this spring (rode more miles that I had in many years). I couldn't figure out what that was. Also I had to nap for several hours like you did. I think the dehydration caused some degree of heat exhaustion, or at least a form of overexertion. If your pupils are dilated you'll most likely get blurred vision as well. I didn't look in the mirror closely that day. Just wanted to lie down.
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