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Comparison of pelvic muscle architecture between humans and commonly used laboratory species.

Abstract：

INTRODUCTION AND HYPOTHESIS:Pelvic floor muscles (PFM) are deleteriously affected by vaginal birth, which contributes to the development of pelvic floor disorders. To mechanistically link these events, experiments using animal models are required, as access to human PFM tissue is challenging. In choosing an animal model, a comparative study of PFM design is necessary, since gross anatomy alone is insufficient to guide the selection. METHODS:Human PFM architecture was measured using micromechanical dissection and then compared with mouse (n = 10), rat (n = 10), and rabbit (n = 10) using the Architectural Difference Index (ADI) (parameterizing a combined measure of sarcomere length-to-optimal-sarcomere ratio, fiber-to-muscle-length ratio, and fraction of total PFM mass and physiological cross-sectional area (PCSA) contributed by each muscle). Coccygeus (C), iliocaudalis (IC), and pubocaudalis (PC) were harvested and subjected to architectural measurements. Parameters within species were compared using repeated measures analysis of variance (ANOVA) with post hoc Tukey's tests. The scaling relationships of PFM across species were quantified using least-squares regression of log-10-transformed variables. RESULTS:Based on the ADI, rat was found to be the most similar to humans (ADI = 2.5), followed by mouse (ADI = 3.3). When animals' body mass was regressed against muscle mass, muscle length, fiber length, and PCSA scaling coefficients showed a negative allometric relationship or smaller increase than predicted by geometric scaling. CONCLUSION:In terms of muscle design among commonly used laboratory animals, rat best approximates the human PFM, followed by mouse. Negative allometric scaling of PFM architectural parameters is likely due to the multifaceted function of these muscles.

journal_name

Int Urogynecol J

journal_title

International urogynecology journal

authors

Alperin M,Tuttle LJ,Conner BR,Dixon DM,Mathewson MA,Ward SR,Lieber RL

doi

10.1007/s00192-014-2423-9

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

1507-15

issue

eissn

0937-3462

issn

1433-3023

journal_volume

pub_type

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Comparison of pelvic muscle architecture between humans and commonly used laboratory species.