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scanlancm

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  • Real VO2Max--Measure Your Athletic Potential

    Hi, there are really 2 questions here. From a maker perspective, can a low cost VO2 analyser be built? Sadly as I have noted, not with current sensor technology. I have been looking again but paramagnetic O2 sensors seem to be 'contact us for a quote' type items. So still not in home maker territory ( if any electronic engineers are reading this - a small and less than $100 rapid O2 sensor would have big applications in medicine and sports science, and i suspect a lot of other places).The second question is about measuring fitness. For this I suggest search 'incremental shuttle walk test' - it is very low tech, but has good correlation to VO2. There are apps available to assist with test and show predicted VO2 based on result. Hope this helps.

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  • Real VO2Max--Measure Your Athletic Potential

    Hi, this is a reply to 2 posts. Yes for really accurate measurements rapid response O2 is needed.ButSome of the time you can just use CO2. This is because when we start to exercise we burn our (glycogen) carbohydrate stores. Every molecule used to burn carbohydrate makes one molecule of CO2 so measuring CO2 will give O2. But if you exercise for more than 15 to 20 minutes you begin to burn more fat. This gives 80% CO2 to O2. To complicate matters more as you approach a true VO2 max you will move to anaerobic metabolism where you clear more CO2 by breathing more so that the acidity of the blood is kept constant (as the levels of lactic acid climb). To do an accurate test you need to 'ramp' exercise to ensure that you are 'maxed out' by about 15 minutes and be able to measure O2 accurately a…

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    Hi, this is a reply to 2 posts. Yes for really accurate measurements rapid response O2 is needed.ButSome of the time you can just use CO2. This is because when we start to exercise we burn our (glycogen) carbohydrate stores. Every molecule used to burn carbohydrate makes one molecule of CO2 so measuring CO2 will give O2. But if you exercise for more than 15 to 20 minutes you begin to burn more fat. This gives 80% CO2 to O2. To complicate matters more as you approach a true VO2 max you will move to anaerobic metabolism where you clear more CO2 by breathing more so that the acidity of the blood is kept constant (as the levels of lactic acid climb). To do an accurate test you need to 'ramp' exercise to ensure that you are 'maxed out' by about 15 minutes and be able to measure O2 accurately as the relationship with CO2 will be unknown at this point. The device with CO2 only is interesting and will tell you more than a smartwatch, but the goal of VO2 max measurements remains elusive (with current sensor technology).

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