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There was a similar report earlier this summer from the Florida coast. Wouldn't it be deadly to swim in waters that warm? (I mean clearly it was for the dolphi

There was a similar report earlier this summer from the Florida coast. Wouldn't it be deadly to swim in waters that warm? (I mean clearly it was for the dolphins, wondering about human ability to cool when perspiration is not possible)

toomuchtodo 3y ago
Anything above 104F/40C will rapidly lead to heatstroke in humans, that’s why hot tubs are kept at 100-102F. Depending on human, you’ll last 10-20 minutes, but the flesh eating bacteria or brain eating amoeba might still get you. Edit: hah
- 38 3y ago
  > flesh eating bacteria or brain eating amoeba might still get you. Wanna add some context here?
  - deleted 3y ago
    [deleted]
  - mschuster91 3y ago
    > brain eating amoeba That one is naegleria fowleri, which just loves warm, even hot water [1]. It's incredibly rare, but incredibly deadly. > flesh eating bacteria That is vibrio vulnificus [2] or a bunch of other bacteria which love brackish water [3]. [1] https://www.cdc.gov/parasites/naegleria/general.html https://www.cdc.gov/parasites/naegleria/general.html [2] https://www.cdc.gov/vibrio/wounds.html https://www.cdc.gov/vibrio/wounds.html [3] https://www.cdc.gov/groupastrep/diseases-public/necrotizing-fasciitis.html https://www.cdc.gov/groupastrep/diseases-public/necrotizing-...
  - 5555624 3y ago
    Flessh eating bacteria is Necrotizing Fasciitis a bacterial infection that will quickly spread, resulting in amputation and even death.
- shwaj 3y ago
  And I have to imagine that 10-20 minutes would drop significantly if you were exerting yourself instead of relaxing.
- rojeee 3y ago
  According to NHS ophthalmologists at Moorfields eye hospital, I had acanthamoeba keratitis - a rare eye infection which… well… just Google pictures for what happens if left untreated. Theory is, I picked it up after staying in a hot tub too long and then leaving contact lenses in over night. It’s so rare that the trainees never see any patients with it. The consultant asked me if I was OK for all the doctors there that night to have a look. They were fascinated but I was in a fair amount of pain! I had to apply drops of what was effectively bleach to my eye for six months to ensure it went. Very painful. The diagnostic process was incredibly painful too. I can’t wear lenses anymore as I think my cornea is permanently damaged. Luckily my vision is back to normal but took nearly a year to recover. Don’t sleep in your lenses. Don’t wear lenses in the hot tub!
  - toomuchtodo 3y ago
    > Don’t sleep in your lenses. Don’t wear lenses in the hot tub! I know this isn't a solution for everyone, but if a candidate for corrective surgery (PRK, LASEK, LASIK, etc), I highly recommend it. PRK was the best $3k I've ever spent. 20/15 vision for over a decade since surgery, no need to worry about glasses or contacts. Might be able to get away with LASIK or LASEK for faster recovery, I went with PRK and a bit longer recovery time because I live a life where head trauma is more likely than not (which can cause corneal flap complications).
jazzyjackson 3y ago
102 is a good temp for a hot tub. Definitely not deadly, but would not be helpful to cool down on a sweltering day neither (actually I never had the experience of sitting in a hot tub that was cooler than the air, maybe when its 130 out, 100 is refreshingly cool) anyway my bigger concern would be brain eating amoeba edit: jinx
- amluto 3y ago
  I tried this once (in a swimming pool, not a hot tub) -- outdoor temps were around 110F and the pool was over 90F. It was quite unpleasant and definitely not refreshing. Your body can evaporatively cool in hot weather as long as it's dry out and the humidity (and hence wet bulb temperature) is low enough. In a pool, there's no evaporative cooling, and your skin surface will be the same temperature as the water. If it's too hot, it's too hot.
  - alexeldeib 3y ago
    Does it work with lower temps? I’ve always found it odd that human body temp is close to 100F but getting into 90 degree water feels hot. I wonder if it’s the evaporative effect like you said and if it reverses when it’s hot enough. Like if it’s 110 and I get in a 90 degree tub, does it feel good? That’s below the temperature my body naturally wants to be at, why doesn’t it feel “cool”?
    - MaxRegret 3y ago
      The human body is producing about 80 watts of heat just from basic metabolism (unless you're dead) which you need to dissipate to keep your body temperature from going up. The rate of heat transfer out of your body is proportional to the temperature difference, so the environment needs to be cooler than your body. If your environment was exactly the standard body temperature, your body would actually get hotter until the temperature delta was enough to dissipate 80 watts, which would likely be too hot to survive.
      - alexeldeib 3y ago
brucethemoose2 3y ago
That was in a somewhat enclosed bay (Manatee Bay), and the ocean temperature was an anomaly compared to the surrounding buoys. Not that the rest of the ocean wasn't boiling hot at that time!
- RetroTechie 3y ago
  Was out on a boat this summer, on a hot day with moist air. Normally (in summer) it's cooler out on the water. But on that day I had a kind of 'choking' feeling even on the middle of a lake. Like being in an elevator or bus packed with people & not enough ventilation. It was easy enough to take a swim to cool down. But for these dolphins? The water not cooling them down. Swimming at all would raise their body temperature. Out in the ocean they could have dived to deeper (cooler) waters. Or swim to cooler areas. But in the lake/river they were in? No escape from the hot water. One can only imagine how desperate they must have felt right before they died.
thelittleone 3y ago
Why would perspiration not be possible? Humans can perspire when swimming [1]. Though it's effectiveness may be diminished. https://www.a3performance.com/blogs/a3-performance/do-you-sweat-when-you-swim https://www.a3performance.com/blogs/a3-performance/do-you-sw...
- wirrbel 3y ago
  Without evaporation sweat cannot cool
- ceejayoz 3y ago
  Perspiration is only useful via evaporative cooling. It is of no use underwater.
  - thelittleone 3y ago
    When we sweat pores on the skin open (increasing the surface area of the skin). Vasodilaton results in increased blood flow to the skin. The skin is in contact with water. Water ia a better conductor of heat than air.
    - ceejayoz 3y ago
      When the water is warmer than human body temperature - 102F in the article - guess which way that heat conducts.
      - thelittleone 3y ago
        Good point, however still means that. Perspiration in water can lead to increased cooling over non perspiring (if the water is colderthan there swimmers body tenperature).
tornato7 3y ago
People don't swim in the Amazon river, there's lots of other things in there that will kill you! Edit: to clarify, in the areas of the Amazon that I've been to (maybe the more remote areas), nobody swam. Most of the locals didn't even know how to swim despite living on the river. It may be different in other areas.
- pentamassiv 3y ago
  Of course people swim in the Amazon. I did it myself and you can find plenty of videos of people swimming in it and enjoying the river.
  - kreeben 3y ago
    They must've forgot a comma sign there.
- marcosdumay 3y ago
  I wonder what you think all those lethal things are.
- fdgjgbdfhgb 3y ago
  Swimming in the river (with the dolphins!) is a very popular tourist attraction in the Amazon, actually. Just don't pee in the water![1] [1] https://en.wikipedia.org/wiki/Candiru_(fish)#Modern_cases https://en.wikipedia.org/wiki/Candiru_(fish)#Modern_cases
- euroderf 3y ago
  Or if not kill you, certainly spoil your day. Candiru.

toomuchtodo 3y ago

Anything above 104F/40C will rapidly lead to heatstroke in humans, that’s why hot tubs are kept at 100-102F. Depending on human, you’ll last 10-20 minutes, but the flesh eating bacteria or brain eating amoeba might still get you. Edit: hah

38 3y ago
> flesh eating bacteria or brain eating amoeba might still get you. Wanna add some context here?
- deleted 3y ago
  [deleted]
- mschuster91 3y ago
  > brain eating amoeba That one is naegleria fowleri, which just loves warm, even hot water [1]. It's incredibly rare, but incredibly deadly. > flesh eating bacteria That is vibrio vulnificus [2] or a bunch of other bacteria which love brackish water [3]. [1] https://www.cdc.gov/parasites/naegleria/general.html https://www.cdc.gov/parasites/naegleria/general.html [2] https://www.cdc.gov/vibrio/wounds.html https://www.cdc.gov/vibrio/wounds.html [3] https://www.cdc.gov/groupastrep/diseases-public/necrotizing-fasciitis.html https://www.cdc.gov/groupastrep/diseases-public/necrotizing-...
- 5555624 3y ago
  Flessh eating bacteria is Necrotizing Fasciitis a bacterial infection that will quickly spread, resulting in amputation and even death.
shwaj 3y ago
And I have to imagine that 10-20 minutes would drop significantly if you were exerting yourself instead of relaxing.
rojeee 3y ago
According to NHS ophthalmologists at Moorfields eye hospital, I had acanthamoeba keratitis - a rare eye infection which… well… just Google pictures for what happens if left untreated. Theory is, I picked it up after staying in a hot tub too long and then leaving contact lenses in over night. It’s so rare that the trainees never see any patients with it. The consultant asked me if I was OK for all the doctors there that night to have a look. They were fascinated but I was in a fair amount of pain! I had to apply drops of what was effectively bleach to my eye for six months to ensure it went. Very painful. The diagnostic process was incredibly painful too. I can’t wear lenses anymore as I think my cornea is permanently damaged. Luckily my vision is back to normal but took nearly a year to recover. Don’t sleep in your lenses. Don’t wear lenses in the hot tub!
- toomuchtodo 3y ago
  > Don’t sleep in your lenses. Don’t wear lenses in the hot tub! I know this isn't a solution for everyone, but if a candidate for corrective surgery (PRK, LASEK, LASIK, etc), I highly recommend it. PRK was the best $3k I've ever spent. 20/15 vision for over a decade since surgery, no need to worry about glasses or contacts. Might be able to get away with LASIK or LASEK for faster recovery, I went with PRK and a bit longer recovery time because I live a life where head trauma is more likely than not (which can cause corneal flap complications).

jazzyjackson 3y ago

102 is a good temp for a hot tub. Definitely not deadly, but would not be helpful to cool down on a sweltering day neither (actually I never had the experience of sitting in a hot tub that was cooler than the air, maybe when its 130 out, 100 is refreshingly cool) anyway my bigger concern would be brain eating amoeba edit: jinx

amluto 3y ago
I tried this once (in a swimming pool, not a hot tub) -- outdoor temps were around 110F and the pool was over 90F. It was quite unpleasant and definitely not refreshing. Your body can evaporatively cool in hot weather as long as it's dry out and the humidity (and hence wet bulb temperature) is low enough. In a pool, there's no evaporative cooling, and your skin surface will be the same temperature as the water. If it's too hot, it's too hot.
- alexeldeib 3y ago
  Does it work with lower temps? I’ve always found it odd that human body temp is close to 100F but getting into 90 degree water feels hot. I wonder if it’s the evaporative effect like you said and if it reverses when it’s hot enough. Like if it’s 110 and I get in a 90 degree tub, does it feel good? That’s below the temperature my body naturally wants to be at, why doesn’t it feel “cool”?
  - MaxRegret 3y ago
    The human body is producing about 80 watts of heat just from basic metabolism (unless you're dead) which you need to dissipate to keep your body temperature from going up. The rate of heat transfer out of your body is proportional to the temperature difference, so the environment needs to be cooler than your body. If your environment was exactly the standard body temperature, your body would actually get hotter until the temperature delta was enough to dissipate 80 watts, which would likely be too hot to survive.
    - alexeldeib 3y ago

brucethemoose2 3y ago

That was in a somewhat enclosed bay (Manatee Bay), and the ocean temperature was an anomaly compared to the surrounding buoys. Not that the rest of the ocean wasn't boiling hot at that time!

RetroTechie 3y ago
Was out on a boat this summer, on a hot day with moist air. Normally (in summer) it's cooler out on the water. But on that day I had a kind of 'choking' feeling even on the middle of a lake. Like being in an elevator or bus packed with people & not enough ventilation. It was easy enough to take a swim to cool down. But for these dolphins? The water not cooling them down. Swimming at all would raise their body temperature. Out in the ocean they could have dived to deeper (cooler) waters. Or swim to cooler areas. But in the lake/river they were in? No escape from the hot water. One can only imagine how desperate they must have felt right before they died.

thelittleone 3y ago

Why would perspiration not be possible? Humans can perspire when swimming [1]. Though it's effectiveness may be diminished. https://www.a3performance.com/blogs/a3-performance/do-you-sweat-when-you-swim https://www.a3performance.com/blogs/a3-performance/do-you-sw...

wirrbel 3y ago
Without evaporation sweat cannot cool
ceejayoz 3y ago
Perspiration is only useful via evaporative cooling. It is of no use underwater.
- thelittleone 3y ago
  When we sweat pores on the skin open (increasing the surface area of the skin). Vasodilaton results in increased blood flow to the skin. The skin is in contact with water. Water ia a better conductor of heat than air.
  - ceejayoz 3y ago
    When the water is warmer than human body temperature - 102F in the article - guess which way that heat conducts.
    - thelittleone 3y ago
      Good point, however still means that. Perspiration in water can lead to increased cooling over non perspiring (if the water is colderthan there swimmers body tenperature).

tornato7 3y ago

People don't swim in the Amazon river, there's lots of other things in there that will kill you! Edit: to clarify, in the areas of the Amazon that I've been to (maybe the more remote areas), nobody swam. Most of the locals didn't even know how to swim despite living on the river. It may be different in other areas.

pentamassiv 3y ago
Of course people swim in the Amazon. I did it myself and you can find plenty of videos of people swimming in it and enjoying the river.
- kreeben 3y ago
  They must've forgot a comma sign there.
marcosdumay 3y ago
I wonder what you think all those lethal things are.
fdgjgbdfhgb 3y ago
Swimming in the river (with the dolphins!) is a very popular tourist attraction in the Amazon, actually. Just don't pee in the water![1] [1] https://en.wikipedia.org/wiki/Candiru_(fish)#Modern_cases https://en.wikipedia.org/wiki/Candiru_(fish)#Modern_cases
euroderf 3y ago
Or if not kill you, certainly spoil your day. Candiru.