Den respiratoriske kvotient – fordeling mellem fedtforbrænding og kulhydratforbrænding

Den respiratoriske kvotient er et mål for hvordan fordelingen er mellem fedtfoDen respiratoriske kvotientrbrænding og kulhydratforbrænding. Altså fortæller den respiratoriske kvotient om personens respiration (fedt eller kulhydrat). Den respiratoriske kvotient er et meget centralt emne inden for fysiologien, og det er derfor meget godt at have en hvis kendskab til begrebet

Ved forbrænding af et glukosemolekyle tilføres 6 iltmolekyler, og som affaldsprodukt ender vi med 6 kuldioxid- og 6 vandmolekyler. Det kan vi beskrive således:

C6H12O6 + 6 O2 à 6 CO2 + 6 H2O

En tilsvarende proces foregår ved forbrænding af fedtstofferne. Til fuldstændig forbrænding af eksempelvis stearinsyre (en fedttype) benyttes 26 molekyler ilt, og igen får vi kuldioxid og vand, denne gang 18 af hver. Vi kan beskrive det som:

C17H35COOH + 26 O2 à 18 CO2 + 18 H2O

Forholdet mellem udskilt CO2 og optaget O2 kaldes den respiratoriske kvotient eller R-værdien. Ved sukkerforbrænding er den respiratoriske kvotient 1 (6 CO2 / 6 O2 = 1), mens den for fedt er 0,7 (18 CO2 / 26 O2).

Den respiratoriske kvotient er forholdsvis let at bestemme i et laboratorium. I forskningen benyttes den til at få indblik i forholdet mellem fedt- og sukkerforbrænding ved forskellige arbejdsbelastninger. Hvis den respiratoriske kvotient ligger tæt ved 1, sker der en overvejende forbrænding af sukker og vice versa. Hvis den respiratoriske kvotient er 0,85 er fordeling sjovt nok halvt af hver. Ligningen er altså lineær. Protein indgår kun i meget lille grad i forbrændingsprocesserne og er således helt uden betydning.

Den respiratoriske kvotient (graf)

Ved hjælp af bestemmelser af den respiratoriske kvotient har man vist, at kroppen ved hårdt arbejde foretrækker kulhydrater. Hvis arbejdet er lettere og langvarigt, slår vi mere og mere over til fedtforbrænding. Til gengæld er nyttevirkningen 10 % lavere ved fedtforbrænding set i forhold til kulhydratforbrænding.

Træn i fedtforbrændingszonen

Sådan noget FIS!! Ved lavere belastning er fordelingen af fedt og kulhydrat overvejende i fedtforbrænding, men det er fuldstændig ligegyldigt om du forbrænder fedt eller kulhydrat i og med det udelukkende er det samlede forbrug der tæller. Det var lige et lille surt opstød herfra :)

Jeg håber du fandt artiklen bare en lille smule interessant. Har du tilføjelser eller spørgsmål, er kommentarfeltet nedenfor til din rådighed.

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Comments

  1. Det ville være interessant, hvis du gad at uddybe hvorfor det udelukkende er det samlede forbrug, der tæller. Især mange kvinder ville nok stille det spørgsmål, idet der nok er en tendens til at netop træne ved lavere intensitet.

  2. Hej Julian.
    Mange tak for din kommentar. Jeg skal sørge for, at næste artikel der bliver skrevet omhandler hvorfor træningsintensiteten ingen effekt har på fedtdepoterne :)

  3. Hej jakob. Kan du uddybe din figur? Jeg forstår ikke helt hvad tallene på x-aksen fortæller noget om, er det intensitet eller længde, eller noget helt tredje? på forhånd tak
    Hilsen Nanna

  4. Hej Jakob.

    Jeg er på jagt efter hvilken indflydelse luftkvaliteten har på hård fysisk træning.

    Træner selv hård spinning ca 4 timer om ugen. Jeg har selv stor indsigt i luftkvalitet, og lavet nogle personlige målinger på luftkvaliteten under træning. Under træning med 30 personer i lokalet blev CO2-indholdet hævet til 4.500 PPM, hvilket giver mig en stor indikation om dårlig luftkvalitet! Hvad vil det fysiologisk betyde at træne i denne luft?

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