Repetitive dives

[tursiops]

Anecdotal evidence from me with over 50 years of mostly continuous diving does tell me that sometimes there is a noticeable physiological remnant after longer/deeper dives that manifests itself as feeling very tired.

I have similar evidence; which I attribute to N2 exposure. I have only felt this tiredness diving air, never while diving Nitrox, on similar dives....which were around 100 ft (or more) and near the NDL on air, but not near it on Nitrox. First dive of he day.

 

[Capt Jim Wyatt]

I have similar evidence; which I attribute to N2 exposure

Yes. N2 exposure. Off gassing N2 specifically. I have not dived air in many years.

 

[Wallowa]

I don't believe there are any significant/measurable tissue injuries due to micro-bubbles.

Anecdotal evidence from me with over 50 years of mostly continuous diving does tell me that sometimes there is a noticeable physiological remnant after longer/deeper dives that manifests itself as feeling very tired.

Same dive, different day with better hydration, better overall physical shape than the previous dive I have not felt tired at all.

I don't think it's a tissue injury that caused this or I probably would not have any healthy tissue remaining.

Maybe Richard Pyle and I have something in common.... erroneous anecdotal data.

Love it!....no, indeed 'anecdotal data' is all we currently have...after 65 years of Scuba diving; commercial, professional, recreational, deep and hair ball dives mainly on air, some nitrox and limited CCR....it would be difficult to determine if any my foibles were contributed to or generated by my dive time. Asymptomatic tissue insults cannot be described until determination of not just the mechanism-of-injury, but a detailed description of the type and extent of injury. The world looks flat on the ocean and the true extent of diving injuries may be a "Here-be-Dragons" discovery.

That is the salient point for me.... nobody knows and we only postulate without "significant/measurable" histological data.... even factoring in necropsies on sat divers showing previously unknown & undocumented osteonecrosis [long bones and spine] and we still are left with WAGs based on suppositions…. educated suppositions, but still shots in the dark. What is occurring at the cellular level without any signs or symptoms of DCI?

I am not a seer or expert and only offer my thoughts/opinions to stimulate inquiry and dialogue…but considering micro-nuclei and pitting associated with these nuclei, the assumption that there isn’t tissue level asymptomatic damage in my opinion is a slippery slope of playing ostrich. Reality may suck but best to know rather than guess.

Still for me diving is well worth the risks involved...even after all these decades.

 

[Deeply Safe Labs]

New one :

 

[Deeply Safe Labs]

Do you know how much the US Navy has contributed to improving decompression procedures?

 

[crofrog]

I'm sorry, my primary learning mode is NOT watching videos and listening, but rather by reading. The reason is that in a video the information is coming at me at a speed determined by the presenter, which is usually either slower or faster than what my brain can pay attention to or process. Too slow and my mind wanders; too fast and I fall behind. The language issue only exacerbates the problem.

I suspect i have useful information to provide back to you on this subject, but am not going to try any more and watch your videos.

Good luck.

You know you can change playback speeds

 

[Deeply Safe Labs]

The development of a small Doopler probe has made it possible for the first time to hear the bubbles...

 

[Deeply Safe Labs]

Do you really know the contribution made by Albert Bühlmann and his colleague Hannes Keller to the safety of our decompressions?

 

[Deeply Safe Labs]

The 1st dive computers...

 

[Blackcrusader]

I have similar evidence; which I attribute to N2 exposure. I have only felt this tiredness diving air, never while diving Nitrox, on similar dives....which were around 100 ft (or more) and near the NDL on air, but not near it on Nitrox. First dive of he day.

My first 35 dives in 12 days in Maldives were on 21% as no nitrox available. So I had a day and night flight to get to Maldives arriving 10:30pm Maldives time 08 May. Was at my hotel before midnight. My flight next day was at 3pm 09 May so had plenty of rest.

My first dive was on 10 May but had to be at the harbour at 7:30am local time. Now this is not bad for me as in Taiwan it would be 10:30am so was not tired. Most of the dives we needed to be at the harbour on the boat around 7:30am. Last dive might be 12:30pm or 2pm depending on prayer time. On one diving day we started 6:45am and last dive was at 11am.

Most of the dives were 50 mins and on some dives our guide would separate us from others and we did some 65 - 70 minute dive times. Every dive you had to deal with currents... was great if you were going with the current but the Farikede site you drop off over a reef that is around 15m depth then head out to the ocean to look for larger marine life. Some circular currents out there and it's a bit of a work out. At near 65 years of age I was the slowest diver by choice but never lost track of others and in some cases it was funny when a large critter was seen and it was where I was and suddenly everyone has to turn around to where I am lol. They swim like mad then.

Each day we would get back to our Inn, shower and change then either eat or just take a rest. Taking a rest led to dozing off for a few hours. I'm not sure nitrox would have made any difference to tiredness. Anyway the dives are often deeper than 40m except at Tiger zoo at max 10m depth at the feeding area and maybe down to 20m on the way out. Where the whale sharks mantas eagle rays hammerheads thresher sharks can be seen at the bottom of the walls often 50m or more.

Some of my deeper than 40m dives I did manage not to go into deco.

Then to Male. I did my first day on 21% but the issue was NDL so switched to Nitrox for the next 3 days.
12 dives 9 on nitrox. Diving had some currents but they were not too strong. Guide told us they do not take some divers to the Wreck site as currents there are strong.

So 47 dives in a 19 day trip. 35 dives in 12 days then a days break then 12 dives in 4 days.