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human physiological diving adaptations cf pinnipeds

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Subject: human physiological diving adaptations cf pinnipeds
From: littoral...@gmail.com (littor...@gmail.com)
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by: littor...@gmail.com - Sat, 3 Jul 2021 08:04 UTC

When the human brain goes diving:
using near-infrared spectroscopy to measure cerebral and systemic cardiovascular responses to deep, breath-hold diving in elite freedivers
J Chris McKnight ... Erika Schagatay 2021
https://doi.org/10.1098/rstb.2020.0349
.....
Freedivers showed cerebral haemo-dynamic changes characteristic of apnoeic diving, some also showed
- considerable elevations in venous blood volumes close to the end of diving,
- pronounced arterial de-oxygenation, the most extreme of which resulted in an arterial saturation of 25%,
- heart rate changes comparable to diving mammals in magnitude & patterns of change ...

IOW, only complete imbecils still believe our Pleistocene ancestors ran antelopes to exhaustion.

There's 0 doubt our Pleistocene ancestors were perfectly adapted to frequently diving for shallow-aquatic foods.

Google
"coastal dispersal Pleistocene Homo PPT"

Re: human physiological diving adaptations cf pinnipeds

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Subject: Re: human physiological diving adaptations cf pinnipeds
From: daud.de...@gmail.com (DD'eDeN aka note/nickname/alas_my_loves)
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by: DD'eDeN aka not - Sat, 3 Jul 2021 08:39 UTC

On Saturday, July 3, 2021 at 4:04:46 AM UTC-4, littor...@gmail.com wrote:
> When the human brain goes diving:
> using near-infrared spectroscopy to measure cerebral and systemic cardiovascular responses to deep, breath-hold diving in elite freedivers
> J Chris McKnight ... Erika Schagatay 2021
> https://doi.org/10.1098/rstb.2020.0349
> ....
> Freedivers showed cerebral haemo-dynamic changes characteristic of apnoeic diving, some also showed
> - considerable elevations in venous blood volumes close to the end of diving,
> - pronounced arterial de-oxygenation, the most extreme of which resulted in an arterial saturation of 25%,
> - heart rate changes comparable to diving mammals in magnitude & patterns of change ...
>
>
>
> IOW, only complete imbecils still believe our Pleistocene ancestors ran antelopes to exhaustion.
>
> There's 0 doubt our Pleistocene ancestors were perfectly adapted to frequently diving for shallow-aquatic foods.
>
> Google
> "coastal dispersal Pleistocene Homo PPT"

Arboreal apes evolve emergency float vests: Laryngeal airsacs
Terrestrial hominins evolve emergency sinking/diving responses

All intelligent species own cats.

interests / sci.anthropology.paleo / Re: human physiological diving adaptations cf pinnipeds

Subject	Author
human physiological diving adaptations cf pinnipeds	littor...@gmail.com
Re: human physiological diving adaptations cf pinnipeds	DD'eDeN aka note/nickname/alas_my_loves