July 19, 2012
Here is a table from an article I read yesterday published in Diabetes.  Don’t be afraid of all the numbers but just direct your attention to the red box I drew in the bottom right corner.  These are measurements of the subjects’ respiratory exchange ratio (RER).  When this number is close to 1.0 it means a person is using carbohydrates for energy as opposed to 0.75 when a person is using mainly fats.  The ability to switch between the two is what exercise scientists specializing in metabolism refer to as "metabolic flexibility".  Coming back to the red box in the table, you can see that the RER is approximately 0.78 which would mean that these people are using more fat for energy.  So what?  Well what I can tell you is that those people are athletes and in this study they are being infused intravenously by lipids.  That means they are literally receiving fat directly into the blood stream but able to use the fat immediately for energy as compared to the sedentary volunteers in this study.  To really drive home the power of this they were also being given glucose at the same time as the lipids but able to use the lipids more than the glucose. It is remarkable ability of an endurance trained exercise adaptation for a person to be able to use the fat for energy immediately instead of storing it and one of the benefits of going out for your run or cycling today.  

Here is a table from an article I read yesterday published in Diabetes.  Don’t be afraid of all the numbers but just direct your attention to the red box I drew in the bottom right corner.  These are measurements of the subjects’ respiratory exchange ratio (RER).  When this number is close to 1.0 it means a person is using carbohydrates for energy as opposed to 0.75 when a person is using mainly fats.  The ability to switch between the two is what exercise scientists specializing in metabolism refer to as "metabolic flexibility".  Coming back to the red box in the table, you can see that the RER is approximately 0.78 which would mean that these people are using more fat for energy.  So what?  Well what I can tell you is that those people are athletes and in this study they are being infused intravenously by lipids.  That means they are literally receiving fat directly into the blood stream but able to use the fat immediately for energy as compared to the sedentary volunteers in this study.  To really drive home the power of this they were also being given glucose at the same time as the lipids but able to use the lipids more than the glucose. It is remarkable ability of an endurance trained exercise adaptation for a person to be able to use the fat for energy immediately instead of storing it and one of the benefits of going out for your run or cycling today.  

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    Wow, imagine if you could use fat for energy, instead of storing it…find out how:
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