Dude, thank you so much to Lionel for allowing us to watch and see all the stuff he does in order to perform at the highest level possible and thank you so much for the guy who's recording and uploading all of it! Without these two dudes we would all probably never know about what goes into being the best or being on the journey to being the best. All this stuff is so freakin interesting and I could sit down and watch that stuff for hours and hours and hours. Keep it coming!!

Immersion diuresis, which literally means “water loss due to immersion,” is the culprit behind that urge to pee when you are in the water. The lower temperature and increased pressure of the surrounding water makes you pee. It’s really as simple as that. Immersion diuresis is a physiological response to being submerged in water and it’s actually part of the Mammalian Dive Reflex. When the body is immersed in water the colder temperatures and increased pressure from the surrounding environment causes a narrowing of the blood vessels (vasoconstriction) in your extremities. As a result of this vasoconstriction, your body moves blood volume away from your skin and extremities and redistributes it towards your core areas. So your coach was partially right with the cold part; the other parts being the increase in pressure and the mammalian dive reflex. Nice work out there Lionel! Can’t wait for the next video

Lionel, this is fantastic stuff. Really appreciate you posting the data analytics and how the body is reacting to the stress of SBR. Please keep these types of videos coming. Incredibly interesting.

We very rarely get a true insite to a professional sportsperson training. Lionel and crew are amazing sharing it.

I am fully geeking out on your videos! Thanks for posting!

Very interesting video. You really are a champion for posting this information. Thanks Lionel and Talbot.

so excited with new videos.. as a newbie just gives you the inspiration to go and strive for greatness

Mega interesting series! Thank you all!

Just love these videos. Absolutely priceless. Thank you!

One of the most interesting and educational videos to date!

LS: to make this test effective, you *have to* do the same pre-race routine, breakfast, fluids etc. Include "wash room stops" pre-start. I would even do the same time of day as the race start

AWESOME. STUFF. TALBOT!

Nice drone work Mr. Talbot. 👌

Love this. Your videos always pull me out of a funk✌

This is great, really interesting science and actually in the real world and not some lab or TV show. Another great video (you need to another GTN interview btw :) )

Very interesting video, and I like how you release a lot of your numbers.

This is so good for you Lionel, I hope you get some benefit 😎

Awesome Sand-Dog. I piss like crazy in the water too. You ain't alone.

Lionel, "I feel like my body is absorbing the water" David, "That would biologically impossible!" Great video as ever. Loved the content 👌🏼

Very interesting. I wonder if you do this test again in September before KOna would the efficiency have risen.

Very interesting analyses

I hypothesize that the conventional thinking and practice of contraction of the abdominal muscles during swimming, for example; drawing in the belly button and maintaining tension in the abdominal region to assist your streamlining, might be over stimulating Lionel's abdominals and may be a contributing factor in creating excess pressure on the bladder. Practising intra-abdominal pressure while swimming (in conjunction with overall practice of Dynamic Neuromuscular Stabilisation, or DNS) could reduce this factor by creating more room in the abdominal cavity for the organs, more room for the diaphragm to expand into for more efficient breathing while still giving support to core region. Also, it allows better rotation through the thoracic area by reducing excessive tension of the abdominal muscles which may increase overall swimming ability.

i think all this testing/optimization is absolutely crucial at that level of performance. It is very thin line between peak performance and winning races and just bonking.

If the cold creates the need to pee, is it not possible it’s also driving heart rate down too ( parasympathetic response ) ? Fascinating to watch this process of breaking g it all down - amazing work from you all

Moustache in the water, watch out for the super fast swimmer!!! 🤙💪😎

Lionel's face at 3.00 is one of not liking interruptions. Not sure it is going to last. Hang in there Lionel!!

Thanks for sharing guys ! @talbot cox you need to put some cash in mikes :) especially to listen to DTD when he is out of the frame of your DSLR

He cannot stand the flat calm of the coach already...😂

Lionel stole that Kona Shaved Ice sign! Quick, call the cops! 😉

Top!👏👌👍👏👏👏❤👍.

MR sanders you look like vegeta ( dragon ball ) with this swimming goggles like rating the power of your rivals ¡¡¡¡ hahaha keep pushing man

A bit of scissors kick, especially the first after breathing. Which, I guess, comes from kicking too much from the knee, rather than the hip. And having the legs spread that wide creates hack of a lot of drag. Lionel's swimming has improved substancially, but there are always small things that can make big difference if corrected. And this is an easy one to correct. And well, buying a 2nd hand wetsuit is never a good idea😁 Anyway, nice approach, having it all dialed in based on pro research. No place 'bro science' here 😉

💪💪💪💪

I would have the same skeptical look as Lionel when the coach is explaining his HR going down on the second lap with his form falling apart and stating that he is getting the same power output.? Seems to be some flaw in that logic. Every other discipline, form collapse equals less efficiency with an increase in HR to maintain the same power\pace. But maybe I only caught part of the conversation and didn't understand what he was actually saying.

It's common to cut weight (sweat) by taking Epsom salt baths. I don't think it's the same as sea salt but you do sweat when swimming - usually less than when running but the amount varies from person to person so you could be sweating a lot more than when running compared to others. Do you use any lotion before a race on your body? Another weight cutting technique is to use alcohol with a bath because the body reacts by sweating more - commonly used by fighters, weightlifters, etc.

Based on the data collected from swimming, what changes could Lionel make? For example, Lionel emphasized that he lost almost a kilogram (2 pounds) after finishing the swim. Entering T1 he’s already in a significant calorie deficit, perhaps?

Great Vdo. Thanks for sharing the data. Now water temperature is around 25.9c in October close to 27.0c which could make a bit of difference. Higher heart rate and more fluid loss. Lionel techique at pool has improved a lot. At open water didn't look smooth. I think his breathing rythm is not right.

is the temp of the water not a factor in oct? different from the time that this video was film?

If they change the course, will you be pissed? 😅

For each 1g of glycogen stored, 3g of water also stored. So, as glycogen is utilised in exercise, what happens to the water?

I think the form goggles separate the swimmers from the people that swim because they do triathlon. I can't see anyone I train with as a swimmer ever using them. They are a good invention if you require them though.

Glycogen uptake is extremely variable. To assume concrete numbers is a big mistake. Testing is key. Time over a season is the answer.

n addition, the cooler the water, the greater the diving response, potentially leading to a lower heart rate and higher blood pressure. Some people respond so strongly to cold water that just putting their face in a bowl of cool water can make them pass out from a low heart rate.

Which goggles are those? Didn't realise they had the HUD display until the end when he Lionel was messing around with them

Has Lionel reviewed those goggles yet?

Lionel, I like you, I must admit though, youre body language suggests you're not sold on the science yet.

The only data he needs for his bike and run: At 164 pounds he is about 14 pounds too heavy. About 2 sec per mile in the marathon PER POUND! So at 150 he is about 25-30 sec per mile faster at the same fitness.

Where can i buy those speedos?

The only swim data he needs is this: Can you do 40 x 100m leaving on the 1:15. If you can, you are in the front pack. Loose one liter in an hour swim? Common knowledge for about 25 years.

Lionel you look like you want to call out that coach or something lol

well, I would say, this was incomplete... 1) swimming in different tri suit compared in race 2) having dry swimsuit before and wet after...? 3) Not catching urine... so you don't know how much you sweat and how much you ... (this is hard to measure, but is possible) #JKcoaching

Its very hard to understand the audio!!

Is he still working with Gerry?

These vids have turned me into a total data junkie. 😸 Also can you do one that shows how to maintain your stroke WHILE you pee? I need to like, float for a sec. Cheers!

I am sympathetic to his plight, but who does a test like this when admitting before it even begins when weighing himself that he must be dehydrated (from yesterday) [3:36]. Sadly that one thing renders everything on this video pretty much useless.... HR data tells you nothing... fluid loss... useless.. I hope they’re not paying the science guy too much.

not gonna lie that coach getting me mad right now @talbotcox

Curious How did he know his Hr when he wasn’t wearing a HR strap or watch?

The financial cost of this must be ridiculous! but you get the data, so more than likely money well spent.

I totally get the advantages of the data from goggles. But are they comfortable? They look like they make a lot of deep red rings around your eyes.

How often do you pee in the pool? Me? Oh never... lol 10 seconds earlier I pee 100 times in a 85 degree swimming pool

What goggles is he wearing?

i never pee in the pool... clasic

song at 00:48 pleasee hahahak

Era pra ter legenda em português

Why wear the Form goggles in open water other than for the advertising?

You pee a lot in the water due to the pressure of the water on your internals. Spoke with my urologist about this and he explained it.

Lactic acid is buffered out through the Urinary System

Interestingly, I feel sad at the end... like the mood changes significantly at the end. Lionel seems disappointed, not sure what that is from (if that's the case) considering it's a session to just collect data.

These experiment is only good for getting the Gist of kona on rave day, the rest is circumstantial which is sadly wasting most of your time. If these tests gets your confidence up for race day then go ahead but know the translation of your experiments to actual comp will be minimal at best.

lionel totally pees in the pool

If you are well hydrated and your HR is zone 2 your kidneys are at their peak perfusion. You are going to pee a lot.

max intake of 90 grams is a bit dated tho

Dude, use Magic5 goggles. They are so comfortable and you finish without the goggle marks. Custom fitted and produced. If they are good enough for Ben Kanute....

I’m afraid I don’t see much future for all this science-like stuff from the ‘guru’. Curious about how long shall LS keep up with this guy.

Maybe your drinking water while swimming without even realizing it. Small amounts over the whole time swimming is adding up enough to make you pee.

.....what? no wet suit for this data collection....?

10.29. "you're just saying words and numbers now aren't you.?" " yep" "you don't think I can win do you? " "Duno" "Am I still paying you though? " "Oh God ye"

those goggle marks...

Swimming is the best to teach Newton Law, its pretty simple if you care to learn about it. Why your HR goes lower when you feel like you're putting more effort and actually going slower. Yeah the cause of peeing in the water, is called vasoconstriction. The body constrict the blood vessel to direct the heat towards the core to keep it warm, so this puts strain on your arterial valve(increase in blood pressure). And the best way to manage blood pressure is to relief bodily fluids, in this case your body goes through what its called "cold immersion diuresis". Kidney filters too much fluids which increases urination.This is also the theory why open water swimmer may suffer from SIPE.

Lionel, why didn’t you put on the wetsuit like in the race? Temperatures and intensity could be different...

Why wouldn't he wear the suit he actually races in?

That coach doesn’t seem to be very convincing in body language and speech.

Don't swim draft Lionel

he has cuts around his eyes from those stupid glasses.