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.