CrossFit Discussion Board  

Go Back   CrossFit Discussion Board > CrossFit Forum > Fitness
CrossFit Home Forum Site Rules CrossFit FAQ Search Today's Posts Mark Forums Read

Fitness Theory and Practice. CrossFit's rationale & foundations. Who is fit? What is fitness?

Reply
 
Thread Tools
Old 09-29-2008, 04:38 AM   #1
Jerry Mobbs
Member Jerry Mobbs is offline
 
Jerry Mobbs's Avatar
 
Profile:
Join Date: May 2006
Location: Dhaka  Bangladesh
Posts: 216
WODs and Mixed Gas Diving on the same day?

Is anyone doing the WODs and going mixed gas diving on the same day?

If so:

1. Are you modifying the WODS by scaling down?

2. Do you notice any decrease in performance over multi day repetitive technical dives?

3. Can you give me an indication of the depth, times and helium fractions you are using?

4. How much time do you leave between WOD and dives?

Sorry for the slightly oddball question, but I'm specifically interested in mixed gas dives, NOT air or nitrox.

Thanks

Jerry
  Reply With Quote
Old 09-29-2008, 09:58 AM   #2
Mike Prevost
Member Mike Prevost is offline
 
Profile:
Join Date: Jun 2008
Location: California  MD
Posts: 119
Re: WODs and Mixed Gas Diving on the same day?

Quote:
Originally Posted by Jerry Mobbs View Post
Is anyone doing the WODs and going mixed gas diving on the same day?

If so:

1. Are you modifying the WODS by scaling down?

2. Do you notice any decrease in performance over multi day repetitive technical dives?

3. Can you give me an indication of the depth, times and helium fractions you are using?

4. How much time do you leave between WOD and dives?

Sorry for the slightly oddball question, but I'm specifically interested in mixed gas dives, NOT air or nitrox.

Thanks

Jerry
Jerry

I would be discussing these questions with a hyperbaric medical specialist or a diving medical specialist, not a bunch of people on a crossfit board. this is not a crossfit question, it is more of a medical question. Think about it, some guy chimes in with specific recommendations and you don't know him from Adam...you gonna follow those recommendations? OK to do that for training advice, but not for mixed gas diving in my opinion. Just my $.02

Mike
  Reply With Quote
Old 09-29-2008, 06:15 PM   #3
Jerry Mobbs
Member Jerry Mobbs is offline
 
Jerry Mobbs's Avatar
 
Profile:
Join Date: May 2006
Location: Dhaka  Bangladesh
Posts: 216
Re: WODs and Mixed Gas Diving on the same day?

Mike,

I'm interested in what people are actually doing. A Hyperbaric doctors default answer would be 'don't'.

I've been technical diving for 10 years and CrossFitting for over 2.

When I dive, I have been stopping the WOD and doing BW calisthenics and the odd run in the morning. This is generally followed by 1 morning dive in the 60-80m range and then a second in the afternoon on the 40-60m range.

I would class my training as 'low intensity' during the weeks that I dive.

I am wondering if anyone (possibly on the NEST teams) is doing WODS and diving in the same day.

Thanks

Jerry
  Reply With Quote
Old 09-29-2008, 09:15 PM   #4
Jason Peacock
Member Jason Peacock is offline
 
Jason Peacock's Avatar
 
Profile:
Join Date: Mar 2008
Location: Seattle  WA
Posts: 563
Re: WODs and Mixed Gas Diving on the same day?

I'm a very occasional recreational diver, and from what little I do know about diving (definitely not anything fancy) I don't understand why it would matter if you exercised on the same day that you went diving?

Are you worried that you'll be too tired to swim? That you'll deplete the oxygen carrying capacity of your body for the day? (is that possible?) Are WODs equivalent to hyper-ventilating and that's too much oxygen in your blood when you dive later in the day?

The truly curious want to be educated
  Reply With Quote
Old 09-29-2008, 11:21 PM   #5
Skylar Cook
Member Skylar Cook is offline
 
Skylar Cook's Avatar
 
Profile:
Join Date: Jan 2007
Location: Jupiter  FL
Posts: 839
Re: WODs and Mixed Gas Diving on the same day?

Having just taken an open water/nitrox course, I'd say that it'd be OK, but much safer if you worked out BEFORE diving. It'll increase your metabolic rate a bit, so you might go through a bit more air, but I (personally) would not workout post-dive. Reasoning is as follows:

-If you workout first, you're not really changing much. You might be tired during the dive, perhaps a little sore, and burn a little more air, but none of that is potentially life-threatening.

-From chemistry class, we know that gas solubility decreases in warmer liquids. If you've got excess nitrogen (helium, whatever you're diving on) in your bloodstream and you workout (thus increasing your core temperature), more gas is going to come out of solution, possibly giving you the bends or exasperating a minor case of it.


Of course, this logic all fails with an extremely technical dive: I wouldn't recommend doing anything else if you're planning to go really deep and/or for an extended time, or doing consecutive dives on a single day. If you're going on helium, that's out of my experience. Personally I wouldn't dive deep enough so as to require helium on the same day as a WOD. We really didn't evolve doing any diving, so our bodies aren't particularly well-equipped to handle it, thus the potential for some nasty problems. And its some serious **** if you get the bends or decomp illness.
__________________
"If you even dream of beating me you'd better wake up and apologize." -Ali
  Reply With Quote
Old 09-30-2008, 12:13 AM   #6
Brandon Oto
Member Brandon Oto is offline
 
Profile:
Join Date: Mar 2007
Location: Santa Cruz  CA
Posts: 3,001
Re: WODs and Mixed Gas Diving on the same day?

Quote:
Originally Posted by Skylar Cook View Post
-From chemistry class, we know that gas solubility decreases in warmer liquids. If you've got excess nitrogen (helium, whatever you're diving on) in your bloodstream and you workout (thus increasing your core temperature), more gas is going to come out of solution, possibly giving you the bends or exasperating a minor case of it.
I don't care whether you're on trimix or pure uranium, if you don't surface right, you won't need a WoD to kill you; I'll drive over there and beat you to death with a teakettle.

Nobody should be walking around with excess anything in their bloodstream. Obviously if you think you've got DCS then you shouldn't be doing Fran, but given that you should instead be sitting in a chamber somewhere, that probably goes without saying.
  Reply With Quote
Old 09-30-2008, 04:04 AM   #7
Jerry Mobbs
Member Jerry Mobbs is offline
 
Jerry Mobbs's Avatar
 
Profile:
Join Date: May 2006
Location: Dhaka  Bangladesh
Posts: 216
Re: WODs and Mixed Gas Diving on the same day?

Guys

Thanks for taking the time to answer.

It was a long shot throwing this one out there and hoping to find a CrossFitting technical diver.

I feel some more experimentation coming on over Christmas.

Jason, I'm not swimming at 80m. I use a scooter.

Jerry
  Reply With Quote
Old 09-30-2008, 08:33 AM   #8
Heath Powell
Member Heath Powell is offline
 
Profile:
Join Date: Jul 2008
Location: Melbourne  FL
Posts: 91
Re: WODs and Mixed Gas Diving on the same day?

Hey Jerry, I'm a dive master for NASE. I read a study once about high anarobic training pre and post dives. The surveys dives where sport dives on a 90fsw reef using EAN36. It was recorded that divers who worked out before the dive had a faster nitrogen scrub time then the group that had not worked out yet. It also showed that the divers who worked out post dive got a failure in there workouts faster they would if they had not dived that day.
  Reply With Quote
Old 09-30-2008, 03:27 PM   #9
Skylar Cook
Member Skylar Cook is offline
 
Skylar Cook's Avatar
 
Profile:
Join Date: Jan 2007
Location: Jupiter  FL
Posts: 839
Re: WODs and Mixed Gas Diving on the same day?

Quote:
Originally Posted by Brandon Oto View Post
I don't care whether you're on trimix or pure uranium, if you don't surface right, you won't need a WoD to kill you; I'll drive over there and beat you to death with a teakettle.

Nobody should be walking around with excess anything in their bloodstream. Obviously if you think you've got DCS then you shouldn't be doing Fran, but given that you should instead be sitting in a chamber somewhere, that probably goes without saying.
Where did you get the idea of surfacing incorrectly from? My point was that the tables and computers are based on you sitting and doing nothing after the dive. You WILL have residual nitrogen and gases in your blood after you dive, no matter how safe you play the decompression. My point was that working out post-dive will increase your temperature and thus decrease the solubility of the gases, causing them to come out of solution (e.g. your blood) faster than if you were just sitting. It is this phenomenon that can give you DCS/the bends even if you surface correctly.
__________________
"If you even dream of beating me you'd better wake up and apologize." -Ali
  Reply With Quote
Old 09-30-2008, 04:32 PM   #10
Brandon Oto
Member Brandon Oto is offline
 
Profile:
Join Date: Mar 2007
Location: Santa Cruz  CA
Posts: 3,001
Re: WODs and Mixed Gas Diving on the same day?

Exactly how hot do you think blood gets?

Your temperature self-regulates. If your core temp significantly increases during a workout, that means that you've overloaded your body's compensation mechanisms, and this is already bad.
  Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gas from greens? Amy Crawford Nutrition 8 07-18-2008 12:20 PM
choosing WODs for 4 day a week program Jerimiah G Gentry Workout of the Day 1 09-07-2007 10:18 AM
Out of gas after 3 hours Jorge Javier Wilsterman Fitness 9 08-06-2007 07:31 AM
Favorite WODs for Mixed Martial Arts? Frank DiMeo Workout of the Day 9 12-07-2005 09:59 PM
How to mess up two WODs on the same day . . . David Wood Workout of the Day 1 07-17-2003 01:12 PM


All times are GMT -7. The time now is 04:49 PM.


CrossFit is a registered trademark of CrossFit Inc.