If you don’t use the device correctly, such as blowing too hard or too little air, it disallows the measure. The standardized procedure you follow when using the device helps with reliability. (2021) found that the Lumen was valid for detecting changes in metabolic fuel utilization compared with a laboratory metabolic cart. Taking a reading after exercise Is it accurate?Ī study by Lorenz et al. An RER value is usually between 0.7 and 1.0, though the Lumen uses a more user-friendly scale of 1 to 5, with a high CO 2 level (5) indicating carbohydrate burning and low CO 2 level (1) indicating fat burning. This value can then be used to indicate the type of fuel your body is using to produce energy. The Lumen determines the volume of CO 2 in the breath based on the CO 2 concentration in a standard volume of air blown through the apparatus. The Respiratory Exchange Ratio ( RER) is the ratio between the volume of CO 2 being produced by the body and the amount of O 2 being consumed. How it worksĪccording to their website, the Lumen measures "the CO 2 in your breath through the sensor and flow meter, based on the RER metric". After tracking this measure over time, you can get a score of "metabolic flexibility", and advice is given to help you "hack your metabolism". From this CO 2 value, it can estimate the type of fuel your body is using to produce energy. The device uses indirect calorimetry to measure one of the products of this cellular metabolism, the carbon dioxide (CO 2) in the air we breathe out. The Lumen claims to be “assisting you to master and improve the health of your metabolism”, or to improve fitness by “hacking” your metabolism. Metabolism is the chemical reactions in the body’s cells that change food into energy. The lumen packaging is very stylish What does it do?
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