Respiratory quotient

Jump to: navigation, search

WikiDoc Resources for Respiratory quotient

Articles

Most recent articles on Respiratory quotient

Most cited articles on Respiratory quotient

Review articles on Respiratory quotient

Articles on Respiratory quotient in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Respiratory quotient

Images of Respiratory quotient

Photos of Respiratory quotient

Podcasts & MP3s on Respiratory quotient

Videos on Respiratory quotient

Evidence Based Medicine

Cochrane Collaboration on Respiratory quotient

Bandolier on Respiratory quotient

TRIP on Respiratory quotient

Clinical Trials

Ongoing Trials on Respiratory quotient at Clinical Trials.gov

Trial results on Respiratory quotient

Clinical Trials on Respiratory quotient at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Respiratory quotient

NICE Guidance on Respiratory quotient

NHS PRODIGY Guidance

FDA on Respiratory quotient

CDC on Respiratory quotient

Books

Books on Respiratory quotient

News

Respiratory quotient in the news

Be alerted to news on Respiratory quotient

News trends on Respiratory quotient

Commentary

Blogs on Respiratory quotient

Definitions

Definitions of Respiratory quotient

Patient Resources / Community

Patient resources on Respiratory quotient

Discussion groups on Respiratory quotient

Patient Handouts on Respiratory quotient

Directions to Hospitals Treating Respiratory quotient

Risk calculators and risk factors for Respiratory quotient

Healthcare Provider Resources

Symptoms of Respiratory quotient

Causes & Risk Factors for Respiratory quotient

Diagnostic studies for Respiratory quotient

Treatment of Respiratory quotient

Continuing Medical Education (CME)

CME Programs on Respiratory quotient

International

Respiratory quotient en Espanol

Respiratory quotient en Francais

Business

Respiratory quotient in the Marketplace

Patents on Respiratory quotient

Experimental / Informatics

List of terms related to Respiratory quotient

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


The respiratory quotient (or RQ or respiratory coefficient), is a unitless number used in calculations of basal metabolic rate (BMR) when estimated from carbon dioxide production. Such measurements, like measurements of oxygen uptake, are forms of indirect calorimetry. It is measured using Ganong's Respirometer.

It can be used in the alveolar gas equation.

Calculation

The respiratory quotient (RQ) is calculated from the ratio:

RQ = CO2 produced / O2 consumed

In this calculation, the CO2 and O2 must be given in the same units, and in quantities proportional to the number of molecules. Acceptable inputs would be either moles, or else volumes of gas at standard temperature and pressure (time units may be included, but they cancel out since they must be the same in numerator and denominator).

The range of respiratory coefficients for organisms in metabolic balance usually ranges from 1.0 (representing the value expected for pure carbohydrate oxidation) to ~0.7 (the value expected for pure fat oxidation). See BMR for a discussion of how these numbers are derived. A mixed diet of fat and carbohydrate results in an average value between these numbers. An RQ may rise above 1.0 for an organism burning carbohydrate to produce or "lay down" fat (for example, a bear preparing for hibernation).

RQ value corresponds to a caloric value for each liter (L) of CO2 produced. If O2 consumption numbers are available, they are usually used directly, since they are more direct and reliable estimates of energy production.

RQ as measured includes a contribution from the energy produced from protein. However, due to the complexity of the various ways in which different amino acids can be metabolized, no single RQ can be assigned to the oxidation of protein in the diet.

Respiratory Quotients of Some Substances

Reference [1]

Name of the substance Respiratory Quotient
Carbohydrates 1
Triolein (Fat) 0.7
Oleic Acid (Fat) 0.71
Tripalmitin (Fat) 0.7
Proteins 0.8 - 0.9
Malic acid 1.33
Tartaric acid 1.6
Oxalic Acid 4.0

External links


References

  1. Telugu Academi, Botany text book, 2007 Version



de:Respiratorischer Quotient


Linked-in.jpg