The relationship among flow rate, chamber volume and calculated rate of metabolism in vertebrate respirometry

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Brian K McNab

Abstract

A relationship exists among the calculated rate of metabolism of an animal enclosed in a chamber, chamber volume and air flow rate. A "critical" flow rate, defined as the minimal flow rate that produces a complete mixture of chamber gases, characterizes each chamber/animal combination. At flow rates below the critical flow rate, calculated rates of metabolism decrease with flow rate and approach zero as flow rate approaches zero. These calculated rates are unreliable estimates of rate of metabolism. At flow rates greater than the critical flow rate, calculated rates of metabolism are independent of flow rate because a reciprocal relationship exists between flow rate and the differential in oxygen content found between the air entering and exiting the chamber; they represent an accurate estimate of the animal's rate of metabolism under the conditions to which the animal is exposed. The critical flow rate increases with chamber volume, the animal's rate of metabolism and with any factor that increases rate of metabolism, including body mass, activity and in endotherms ambient temperatures below thermoneutrality, although chamber volume is its single most important determinant. Some evasions of the critical flow rate are discussed.

Citations

Aug 9, 2013·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Marshall D McCue, Erik D Pollock
Aug 31, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Marshall D McCueDavid T Hanson
Jul 27, 2010·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kenneth C Welch
Sep 30, 2014·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Mei-Xiu WuJin-Song Liu
Jul 22, 2008·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Tomasz Pis
Apr 25, 2006·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Brian K McNab, Hugh I Ellis
Mar 8, 2008·Physiology & Behavior·M ScantleburyN C Bennett
Nov 5, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Ryan S O'ConnorAndrew E McKechnie
Mar 10, 2016·Asian-Australasian Journal of Animal Sciences·Eduardo Lucas Terra PeixotoKássia Amariz Pires
Apr 16, 2020·The Journal of Experimental Biology·Brian K McNab, Kerry A Weston
Aug 3, 2021·Frontiers in Physiology·Kasja MalkocMichaela Hau

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