Often asked: 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 indicate?

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.

What does an RER of.85 mean?

If the RER is. 85, then equal amounts of carbohydrate and fat are being used for energy production. Interestingly, the RER is about 0.7 at rest, meaning the body is consuming mostly stored fat. So 80 calories came from fat, and 20 calories came from carbohydrates.

What is the RER at max exercise?

Background. A maximal exercise respiratory exchange ratio (RER_max) ≥1.10 is commonly used as a criterion to determine if a “true” maximal oxygen uptake (VO₂max) has been attained during maximal-effort exercise testing.

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.

What are typical RER values?

The RER under typical metabolic conditions with stable respiratory function ranges from 0.7 to 1.0. If RER is lower than 0.7 or higher than 1.0, prolonged starvation or excessive recent energy consumption should be suspected, both events representing protocol violation of resting metabolic rate (4).

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.

What does an RER greater than 1 mean?

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.

What does it mean if RER is above 1?

If R is near 1.0, then the body is using mostly carbohydrates for energy production. If R is above 1.0, then carbon dioxide is being produced by other means, usually from the buffering of lactic acid. This indicates that the person is working very hard, or that they are hyperventilating. Typically, R will be about.

Why is RER important?

The respiratory exchange ratio (RER) indirectly shows the muscle’s oxidative capacity to get energy. Sedentarism, exercise and physically active lifestyles modify it.

What is the highest VO2 max ever recorded?

The highest ever recorded VO2 max is 96 ml/kg/min, attributed to Bjørn Dæhlie, and 77 ml/kg/min in women. Both were cross-country skiers.

What causes an RER to exceed 1.0 during exercise?

Why does RER exceed ‘1’? This is due to the non-metabolic buffering of CO2 by bicarbonate as exercise intensity increases.

Does age affect RER?

However, RER decreased from approximately 0.9 to 0.8 by 10 weeks of age and subsequently returned to approximately 0.9 at 22 weeks of age. The changes in RER were concurrent with the alterations in body weight and blood glucose level.

How is RER calculated?

RER is calculated by dividing the volume of CO₂ produced by the volume of O₂ consumed. This is done by indirect calorimetry at rest or during exercise, using a spirometer (or another device to measure airflow or breath volume), and oxygen and carbon dioxide analyzers.

What is VCO2?

Carbon Dioxide Output (VCO2): refers to the amount of carbon dioxide exhaled from the body per unit time.