Like a kid in a candy store I am jittery with excitement as I am poised to share the next block of data for your perusal. Today I engaged the treadmill at Life Time Fitness - St Louis Park, MN with HEED in my tummy and an appetite to tackle the same protocol from Jan 10, 2013. Working through the 8.9 to 10.9 MPH progression works the mind and body for sure.
For this test I took on 1 scoop of HEED within 24 oz of water. Within 10 min I was on the tread and working the belt. For what its worth, my gut was not as settled as it was when rolling with UCAN. I have used HEED previously in training, but was never able to validate substrate (fat vs carbohydrate utilization) preference until working at Life Time Fitness.
Below you will see that there was a stark difference between the two tests:
Please take a few minutes to see the significant difference between substrate use between the UCAN and HEED tests. For purposes of this post I want to zero in solely on the Training Phase (TP). First the similarities. You will note that HR response was actually pretty similar for both. That is where the similarities stop friends. By stage 3 (9.7 MPH) my body began to shift towards carbohydrates over fat for fuel. This can be seen by the RQ value of .84 (for more on RQ please refer to my previous post). By stage 4 (10.1 MPH) my body was happy to sink its teeth in carbs vs. fat to fuel the intensity I was driving. From that point forward there was no turning back. You will note that by the final stage I was only pulling 12.7% from fat. The rest was from carbohydrates, which are finite in supply.
Shift focus for a moment to the UCAN test and you will see that my body never went beyond an RQ of .84. That is remarkable. Please take note that at the same HR (minus a beat) my body was using 54% fat for energy and only ~13% fat while using HEED.
Please keep in mind that this is only two data points on one guy. The validity of these findings would be strengthened if I had 500+ more samples to pull from. I lack the funding and time to support such research ;). In the weeks to come I will continue to consume other brands and see what happens against the variables noted above.
Hope this post makes you question your fueling preferences. One last thought friends. The reason I am pushing a pace and protocol like the one above is to make one think how powerful this product would be at Ironman and Half Ironman intensity (~50 to 75% max VO2). I can't wait to start testing this product at low end Ironman intensity. Can you imagine delving into 75% fat stores while pushing 200 watts? Or at 7:30 pace? By the numbers I am seeing I am left to imagine 85% fat use and the remaining coming from carbohydrates. Gitty up to that! This is the stuff that makes me envision setting an IM PR of 9 flat some day. LETS ROLL!
Train smart, think big,