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• W4378649157 abstract "The concepts of compliance and elasticity are both used in medical physiology to describe how a soft tissue reacts to an external force. In general, compliance is defined as ΔV/ΔP (a change in volume (V)/a change in pressure(P)), but the interpretations of this definition are inconsistent. When compliance is addressed, the definition of elasticity is not presented, so the relationship between compliance and elasticity is not addressed, which causes confusion in students’ learning of the two concepts. The goals of this study are 1) draw attention to the inconsistent definitions through an analysis of teaching materials; 2) eliminate the confusion by supplementing the missing information to provide a complete picture of the two related concepts; and 3) illustrate how these concepts should be applied to 1-D and 3-D deformation in soft tissues. Results are as follows. 1) Inconsistent interpretations of compliance: Among 16 medical physiology textbooks and 2 USMLE Step 1 review books analyzed regarding the heart, arteries and vein, 33% of books claim compliance related to elasticity (without showing how), 22% to stiffness, 44% to distensibility, and 17% to capacitance. 2) The missing content but essential to medical physiology: In material science, Young’s/elastic modulus (E) and Bulk’s modulus (K) measure the elasticity for 1-D and 3-D materials respectively. Their relationship with compliance are formally addressed and mathematically illustrated via the following equations: E= σ/ε, where E is elastic modulus, σ is stress, and ε is strain; and K= - ΔP/(ΔV/V0), where K is Bulk’s modulus, and V0 is initial volume, and ΔP/(ΔV/V0) is compression. 3) During a vessel’s constriction, a point in the vessel’s wall moves in a 1-D dimension, so in dealing with arteries and veins, the first equation applies. The second equation applies to the heart due to the 3-D change of the heart. In conclusion, adding the following essential information eliminates the confusion about compliance and elasticity: 1) Definitions of Young’s and Bulk’s moduli to address soft tissues elasticity with 1-D and 3-D deformations and 2) The mathematical reciprocal relationship between a type of compliance and its corresponding modulus. This is the full abstract presented at the American Physiology Summit 2023 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process." @default.
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• W4378649157 date "2023-05-01" @default.
• W4378649157 modified "2023-09-25" @default.
• W4378649157 title "Compliance and Elasticity in Medical Physiology: Confusion and Clarification" @default.
• W4378649157 doi "https://doi.org/10.1152/physiol.2023.38.s1.5724993" @default.
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