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interests / sci.anthropology.paleo / Walking bp vs running bp

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* Walking bp vs running bpDD'eDeN aka note/nickname/alas_my_loves
`* Re: Walking bp vs running bplittor...@gmail.com
 `- Re: Walking bp vs running bpDD'eDeN aka note/nickname/alas_my_loves

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Walking bp vs running bp

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Subject: Walking bp vs running bp
From: daud.de...@gmail.com (DD'eDeN aka note/nickname/alas_my_loves)
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 by: DD'eDeN aka not - Mon, 19 Jul 2021 04:21 UTC

Walking dense occiput, running light occiput
Homo walker no chin,
Homo sapiens runner, chin, no brow ridges.

How and why do humans grow thin skulls?
a test of the Systemic Robusticity Hypothesis
Lynn E Copes 2010 AAPA

The most widely accepted theory about the influences on osteogenesis is Wolff‘s Law:
physical activity provides the mechanical stimulus necessary to induce osteogenesis.
Recently, Lieberman (1996 AJPA 101:217) suggested the Systemic Robusticity Hypothesis (SRH):
increased cortical bone thickness is also influenced by the release of growth hormone (GH) during exercise.
GH would have systemic effects, increasing osteogenesis, even in non-weight-bearing bones.

I provide an indirect test of the SRH:
I compared measures of robusticity of the humerus, femur & cranium in 25 individuals (Terry Collection, Nat.Mus.Nat.Hist. Wash.DC).
The SRH predicts that measures of robusticity in different skeletal elements from the same individual should be highly correlated.
Results provide intriguing, but equivocal support for the SRH. Ordinary least squares regression analyses fail to support a relationship between cranial & postcranial robusticity within the small sample,
but several pair-wise comparisons (calculated by Spearman ρ rank correlation coefficients) support the SRH, as do Kendall’s W coefficients of concordance.

A direct test of the SRH would require measuring the pharmacological & physiological effect of HG on osteogenesis.
But the main problem influencing this & other investigations of cranial robusticity is a lack of agreement on how to define & quantify the trait

Re: Walking bp vs running bp

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Subject: Re: Walking bp vs running bp
From: littoral...@gmail.com (littor...@gmail.com)
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 by: littor...@gmail.com - Wed, 21 Jul 2021 10:38 UTC

Op maandag 19 juli 2021 om 06:21:33 UTC+2 schreef DD'eDeN aka note/nickname/alas_my_loves:

> Walking dense occiput, running light occiput
> Homo walker no chin,
> Homo sapiens runner, chin, no brow ridges.

:-DDD

Grow up, my boy.

Re: Walking bp vs running bp

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Subject: Re: Walking bp vs running bp
From: daud.de...@gmail.com (DD'eDeN aka note/nickname/alas_my_loves)
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 by: DD'eDeN aka not - Wed, 21 Jul 2021 17:02 UTC

On Wednesday, July 21, 2021 at 6:38:38 AM UTC-4, littor...@gmail.com wrote:
> Op maandag 19 juli 2021 om 06:21:33 UTC+2 schreef DD'eDeN aka note/nickname/alas_my_loves:
> > Walking dense occiput, running light occiput
> > Homo walker no chin,
> > Homo sapiens runner, chin, no brow ridges.
> :-DDD

> Grow up, my boy.
insults & detours, no science.

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