What is meant by Respiration Quotient (RQ) ? When will the value of RQ be 1 and when will it be less than 1?

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Solution

Respiratory Quotient is the ratio of the volume of carbon dioxide evolved to the volume of oxygen consumed during respiration under standard temperature and pressure.
RQ= Vol of CO2 evolved / Vol of O2 consumed
It will bequal to 1 in the case of carbohydrates as-
$C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + E n e r g y + H_{2} O$
RQ= $6 C O_{2}$ / $6 O_{2}$ = 1
It will be less than 1 in the case of fats and proteins as-
(Fats) - $C_{57} H_{104} O_{6} + 80 O_{2} \to 57 C O_{2} + 52 H_{2} O$
RQ= 57 $6 C O_{2}$ /80 $6 O_{2}$ = 0.71

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