Is tingling down arms on PB ascent DR?

[Ms Mer]

Experienced this today. Someone mentioned that it could be a sign of being close to BO. Is that likely or is a more likely explanation that it was my DR kicking in? It was about my 3rd dive. It was a new PB for me of 21.5m. I did not feel like I was struggling up to the point the sensations started. Did not feel detached or get change in vision. I was working hard on the ascent (some weighting issues that I have now rectified) however.

 

[Mullins]

Much more likely to be hypoxia. The DR you'll generally feel on the way down, especially towards the end of the glide phase, e.g. your legs will tighten up and start to ache even though you aren't using them. Plus you'll feel that most strongly on your first dive rather than your third (see my ravings elsewhere).

Hypoxia can come on more rapidly in CWT than the pool disciplines because of the pressure change as you get close to the surface.

 

[Ms Mer]

Thanks Dave. So how long can one have these sensations before BO really does get close? I think that extra weight I was carrying was not helping as I was having to kick to hard ascend on those last two dives.

 

[Mullins]

Don't know, sorry. Some people feel hypoxia coming on long before they BO; others feel nothing and then it's suddenly lights out. That weighting would have had a huge impact on your dive though.

 

[vali]

don't overweight you ever....
especially in fresh water-dive [the less density of the fresh water has serious effect on buoiancy]
not related to the fresh waters...:
i did that mistake once in the red sea;
because i thaught that more weight will help me go down faster, i overweighted miself [not much...arround 2-3 extrakilos]
but i was not the first diver to go down in that day and i took the monofin not the bifins
well...the effort that i did to stay on the surface untill i dived simply drained me...
i was not unfit to do a CWT, but after that -28m, at the ascent i had for the first time in my life [and the only untill now], the feeling that i will not reach the surface [even for one second]
but again, in freediving, a second is a log time
next day at the Blue Hole i did 2-3 dives at same depths, perfectly weighted and with no problems at all...
CONGRATS for your new PB!!!

 

[Ms Mer]

Don't know, sorry. Some people feel hypoxia coming on long before they BO; others feel nothing and then it's suddenly lights out. That weighting would have had a huge impact on your dive though.

You ain't wrong there!! It was the hardest dive physically (with the effort I had to put in) and psychologically when I saw the plate not getting further below me as quick as it should have. I'm sure Timon would have heard my contractions, as I could! When I saw you take your weight belt off before your dive, I was a bit perplexed, but others had a fair bit of weight on so it did not occur to me to question my weighting. It had been fine (it appeared!) up to 20m. I'm down to 3kg and I still need that to get below the surface.