FAQ: Auxiliary Physical Fitness Indicator What Is?

What does a high RER mean?

A high RER indicates that carbohydrates are being predominantly used, whereas a low RER suggests lipid oxidation (Simonson and DeFronzo, 1990; Pendergast et al. 2000).

What does RER measure?

Respiratory Exchange Ratio (RER) is the ratio between the volume of CO2 being produced by the body and the amount of O2 being consumed. This value of this ratio gives us an indication as to whether the body is operating aerobically or anaerobically.

Why is RER important?

The respiratory quotient (also know as RQ, the respiratory exchange ratio, RER, and most commonly, R) is the ratio of volume of carbon dioxide produced to volume of oxygen consumed. This is important because it provides a pretty good indication of the substrates being utilized for energy production!

What does it mean when RER is greater than 1?

Respiratory Exchange Ratio (RER) makes it possible to calculate which specific fuel (protein, fat or carbohydrate) is being oxidized. In case the value is greater than 1, it indicates anaerobic respiration as a result of more carbon dioxide being generated than the oxygen that is being consumed.

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What is the difference between RQ and RER?

Respiratory quotient (RQ) is the proportion of CO2 volume generated to the O2 volume consumption at cellular levels. Respiratory exchange ratio (RER) is the proportion of CO2 volume generated to the O2 volume consumption by using expelled air in the calculation.

What does an RER of 1 mean?

An RER near 0.7 indicates that fat is the predominant fuel source, a value of 1.0 is indicative of carbohydrate being the predominant fuel source, and a value between 0.7 and 1.0 suggests a mix of both fat and carbohydrate.

Why does RER increase?

As the intensity of the exercise increases and carbohydrates become the dominant or primary fuel, the respiratory quotient and the RER increase to between 0.9 and 1.0. Because RER reproducibly increases during exercise, it is considered a parameter that can document maximal effort.

How do you calculate human RER?


  2. RER = VCO2/VO2. Oxidation of a molecule of Carbohydrate.
  3. Now that I know how to calculate R, what does this mean to me?
  4. You can determine what fuel is being used for energy. production.
  5. R.
  6. Excess Post-Exercise Oxygen Consumption.
  7. Due to:
  8. Maximal Oxygen Uptake (VO2max)

What factors affect RER?

The major determinants of resting RER included muscle glycogen content, training volume, proportion of type 1 fibers, [FFA] and [lactate], and %dietary fat intake (adjusted r(2) = 0.59, P < 0.001). Except for muscle fiber composition, these variables also predicted RER at 25, 50, and 70% W(peak) to different extents.

What is RER and SER?

Quick look. Rough ER (RER) is involved in some protein production, protein folding, quality control and despatch. It is called ‘rough’ because it is studded with ribosomes. Smooth E R (SER) is associated with the production and metabolism of fats and steroid hormones.

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Can RQ be greater than 1?

Can RQ be greater than 1? Abstract. The respiratory quotient (RQ, carbon dioxide emission/oxygen consumption) is believed to range from 0.7–1 depending on the fuels used for catabolism. However, RQ can rise above 1 when CO2 is released without oxygen consumption.

How do you calculate RQ?

The respiratory quotient (RQ) is the ratio of CO2 produced to O2 consumed while food is being metabolized:

  1. RQ = CO2 eliminated/O2 consumed
  2. Carbohydrates: The respiratory quotient for carbohydrate metabolism can be demonstrated by the chemical equation for oxidation of glucose:

Why RQ of fat is less than 1?

Fats and proteins contain a smaller number of oxygen atoms than carbon atoms in their molecules. When fats are used as a substrate in respiration, the RQ is less than 1 because the amount of oxygen utilised is always higher than the amount of carbon dioxide released.

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