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Allometric scaling of diameter change in the original flow-mediated dilation protocol.

Abstract：

:The negative correlation between percent flow-mediated dilation (FMD%) and baseline diameter (D(base)) has only recently been recognised as a fundamental ratio-scaling problem, which is not resolved by significance-testing of D(base) inequality between groups/conditions, nor by covariate-adjusting FMD% itself by D(base). It is resolved appropriately by allometric scaling of the relationship between peak diameter (D(peak)) and D(base) using statistical models. Therefore, we extracted data from a seminal study on FMD%, and re-analysed it using allometric methods. We found that D(peak) did not increase as a constant proportion of D(base), rendering FMD% a biased estimator of differences in endothelial function between artery sites (brachial vs femoral) and age-groups (children vs. adults). The allometric expression was D(peak)/D(base)(≈ 0.90), rather than a simple ratio. In agreement with our previous research, a proper allometric perspective on FMD led to unbiased estimates of endothelial function, with full adjustment for the influence of baseline diameter.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Atkinson G,Batterham AM

doi

10.1016/j.atherosclerosis.2012.11.027

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

425-7

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(12)00822-2

journal_volume

226

pub_type

杂志文章

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