Deep stop duration

[DannyB]

My understanding is that deep stops should be 2 minutes minimum as that's what it takes to do a complete flush of blood through the lungs. A recent post has suggested 30 Second deep stops, that goes against all the training that I've had but I am prepared to admit that I could be wrong.

Discuss....

EDIT: OOOh 666 posts..... It's an evil one

[Paddy Diver]

Ya, saw that and was thinking the same thing. Maybe they know somethiing we dont!!

[Garf]

Originally Posted by DannyB

My understanding is that deep stops should be 2 minutes minimum as that's what it takes to do a complete flush of blood through the lungs. A recent post has suggested 30 Second deep stops, that goes against all the training that I've had but I am prepared to admit that I could be wrong.

Discuss....

EDIT: OOOh 666 posts..... It's an evil one

As with everything in diving, I don't believe there is a "right" or "wrong", there are merely different approaches. Depending on the model you are using, and usually the bottom time/depth, you might end up doing none, 30 second, 1 minute, or 2 minute stops. They can all be appropriate, the only truly important thing is that you understand why whatever model you use is telling you what it is.

[Digger]

The slow ascent will probably deal with what are short stops on paper. As opposed to legging it from the 2 minute deep stop on to the next stop and so on, it seems they're using a much lower ascent rate between stops where your body will catch up.

I am guessing again though.

Digs.

[nigelH]

Originally Posted by DannyB

My understanding is that deep stops should be 2 minutes minimum as that's what it takes to do a complete flush of blood through the lungs. A recent post has suggested 30 Second deep stops, that goes against all the training that I've had but I am prepared to admit that I could be wrong.

Discuss....

Richard Pyle suggested watch the computer so it turns the minute twice so you do somewhere between 61 and 119 seconds. I saw the 2 minutes on DAN Europe's Doppler studies as time for a total flush through the alveoli so I modified that to see the minute tick three time. Also they were talking about every 10 meters - which they rated as better than just going slowly.

I will admit I tend to stuff in extras between the VR3 stops if I've been deep as I'm a coward and my slow ascent rates tend to clear them before I get there. I worry about deep stops but not shallow ones. I'll give it an extra five minutes or maybe ten at 6m but not the big extras some computer conservatism models ask for.

[bang-on]

Originally Posted by DannyB

My understanding is that deep stops should be 2 minutes minimum as that's what it takes to do a complete flush of blood through the lungs. A recent post has suggested 30 Second deep stops, that goes against all the training that I've had but I am prepared to admit that I could be wrong.

Discuss....

EDIT: OOOh 666 posts..... It's an evil one

Hi Danny,

The 2 minute stop rule is as you say to allow a flush at that stop depth and even with a slower than 5 mtrs P/min ascent rate my stops are still 2 mins or more.

Where did you see the 30 Sec Deep Stop posted?

Regards

Barrie

[Paddy Diver]

Originally Posted by bang-on

Hi Danny,

The 2 minute stop rule is as you say to allow a flush at that stop depth and even with a slower than 5 mtrs P/min ascent rate my stops are still 2 mins or more.

Where did you see the 30 Sec Deep Stop posted?

Regards

Barrie

Challenge Digger!

Try this Barrie, post 43

Ian

[Mark Chase]

If you dont set minimum stop durations on Vplanner and Deco planner you will get stops of 30seconds showing up.

Mainly using GF deco the deep stops are 1min. When slating a dive i would have the deepest stop shown then the first over 2min stop. In between id ascend at 3m/min and not stop at all.

Upping all those deep stops to 2mins would seriously up you'r deco. It would have the same affect as doing a 1.5m/min ascent rate. It would increase the deco by 20mins

So using first stop depth and slow ascent for 70m for 30mins 10/85GF


1 @ 48
1 @ 45
2 @ 42 (gas switch)
1 @ 39
1 @ 36
1 @ 33
1 @ 30
1 @ 27
3 @ 24

etc


I would slate this as

1@48
42m Gas switch to 32%
3@24
3@21
4@18
5@15
8@12
9@10 Gas switch to 80%
43@6

Then just do a 3m/min ascent from 48 - 24m

Much easier to remember

ATB

Mark Chase

[Juz]

Bottom line is, as always, what works for you is what works for you.

I do 2 min deep stops and have a very slow ascent.

Juz