How Hot Is It Racing At The Ironman World Champs?! | GTN Does Science!

It’s really hot & humid in Kona, a far cry from the dull grey British weather, but how different really is it for athletes to deal with on race day?! With the help of ‪@precisionfandh‬ Heather compares sweat loss between the two locations and what it would mean for performance!
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[@gavinterry-ui6be]

How did you determine the amount of salt you'd lost in your sweat?

[@cedc4432]

From a previous video

[@sportfittech]

It’s precision hydrations business, they have patches you can order to measure your sodium loss

[@collinclark5832]

Also some tri/cycling/running stores do sweat testing. Playtri near me does sweat testing for $100

[@andrewmcalister3462]

GTN have a previous video on this, linked in the description.

[@jo-annebarfoot5926]

you wore a cap in the Uk and no cap in Kona 😮? therefore not entirely like for like ?

[@SBoots29]

Very Interesting video. Fuel and Hydration for me always tricky. I constantly try different things in training. Now lets see how race day goes. Of course I am just an age grouper but always want to preform well in my own race. Cheers

[@andrewmcalister3462]

7:01 "If you're going to drink something, weigh yourself holding the bottle." So simple that it's genius. Thanks Emily, Andy and Heather.

[@paigeturner9334]

Great video! Andy cut his hair so I almost didn't recognize him after he took off the hat!

[@ej7156]

Great video, but could you please cover how you knew about the salt content of the sweat please?

[@andrewmcalister3462]

Covered in a previous GTN video, linked in the description.

[@Midnight5544]

Which brand of sunglasses are you wearing?

[@untypical7404]

When you calculated the pre/post run weight differences, did you also account for the amount of water consumed in both runs? Did you consume the same amount of hydration in both runs?

[@andrewmcalister3462]

7:01 "If you're going to drink something, weigh yourself holding the bottle."

[@peachxblue]

So to avoid hyponatremia, and dehydration, would it be best to always hydrate with something like nuun electrolytes during workout, as opposed to plain water? I can’t stomach super sugary stuff like Gatorade or Powerade, but slightly flavored stuff works for me.

[@chrisstrider]

Great experiment Heather and Emily😊

[@ChrisLoew]

As a Texan, once aclimated 90F is tolerable, 100 is like an oven, and 108 highs are comical, and then I remember deserts exist with 120F weather so I am good 😆.

[@peterliljebladh]

Wearing the same clothes in two different climate zones may seem unfair. You would not wear shorts & a t-shirt in Finland in Januari jogging through knee deep snow.

[@catgoeswoof8952]

Alternate title: 20 minutes 54 seconds of Heather needing a pee! Fascinating video, thank you for doing the science.

[@JamesMartin-gl8gg]

Intesting video,as last Sunday ran a cross country in 24oC heat, 2:06 and I noticed how long after drinking before intended to go to the toilet. Be interesting to see how I feel after Half Marathon this Sunday in cooler weather.

[@peachxblue]

Ah, the dolphin in the sea :)

[@pandats]

Traitletes life - sweat and wet

[@ironmantooltime]

My sweat rate in the gym is easily 1.5L an hour but I need to find my salt rate.... 🤔👍

[@rsmatondang]

What type of 100% sunglasses are you wearing Heather?

[@doernerrr]

My strategy has been to drink when thirsty and take on enough fuel and salt not to bonk or cramp and I thought that was good enough. Now I see it could be sub-optimal and there could be room for improvement if I put time and energy into refinement. I personally don’t do well in really hot weather and regardless of the amount of water, salt, and carbs I take on my performance suffers dramatically even though I would rank myself as a heavy sweater. What defines the upper temperature/humidity limits for good performance?

[@TamaEnergy]

If u feel thirsty u already dehydrated

[@donnavanderwalt932]

Very informative thank you

[@tomconnolly779]

Well done! Great info!

[@fpvkauai]

lets go !!!!

[@andyshaw5378]

Brilliant video learned loads 👍

[@gtn]

Glad you enjoyed it - is there anything else you'd like to see from us?