tag:blogger.com,1999:blog-35788819.post7454117386309830086..comments2017-02-08T06:41:46.202+11:00Comments on Alex's Cycle Blog: Looking under the hoodAlex Simmonshttp://www.blogger.com/profile/00698332397074026424noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-35788819.post-83498112173512072122014-05-23T02:09:24.014+10:002014-05-23T02:09:24.014+10:00Alex, need advice! Have results from lab test:
FTP...Alex, need advice! Have results from lab test:<br />FTP: 3.4<br />VO2 max: 70ml/kg/min<br />VO2 @ FTP: 55ml/kg/min<br /><br />Is fractional utilization of VO2 max then 55/70 = 78% ? If that is so, then to derive GE:<br /><br />3.4 = 20,900 x 70 x .78 x GE / 60,000<br />3.4 = 1141140GE / 60,000<br />204,000 = 1141140GE<br />GE ~ 18% <br /><br />I'm trying to see where my weakness is to focus on for making improvement. It seems like #1 is low GE followed by #2 FU @ VO2 max ?<br />Robert Huerbschhttp://www.blogger.com/profile/16126192289808967887noreply@blogger.comtag:blogger.com,1999:blog-35788819.post-77886336925395135882014-02-10T16:22:06.907+11:002014-02-10T16:22:06.907+11:00Hi Jari
Well to do that, you just rearrange the f...Hi Jari<br /><br />Well to do that, you just rearrange the formula I posted in the blog item:<br /><br />FTP (W/kg) = Energy per litre O2 (J) x VO2max (ml/kg/min) x Fractional VO2max at threshold (%) x GME (%) / 60 (seconds/minute) / 1000 (ml/litre)<br /><br />If you did a VO2max test, you should already have your GE (since VO2 is measured, and your power output is measured).<br /><br />That just leaves your fractional utilisation, so rearrange the formula accordingly, using same units to give:<br /><br />% fractional utilisation VO2max @ FTP = (FTP W/kg x 60000) / (20900 x VO2max x GE)<br /><br />e.g. (4.0W/kg x 60000) / (20900 x 70ml/kg/min x 22%) = 74.6%Alex Simmonshttp://www.blogger.com/profile/00698332397074026424noreply@blogger.comtag:blogger.com,1999:blog-35788819.post-53080657975138739552013-12-31T17:36:46.556+11:002013-12-31T17:36:46.556+11:00Hi,
Thank's for understandable article. I hav...Hi,<br /><br />Thank's for understandable article. I have done VO2max and FTP tests. Can you please explain, how am I able to calculate my 1) Fractional utilization of VO2max at threshold and 2) Efficiency (GEM %). <br /><br />Cheers<br /><br />JariAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-35788819.post-31586684778911203862013-10-15T15:51:48.047+11:002013-10-15T15:51:48.047+11:00Hi,
I went through most of the linked articles, b...Hi,<br /><br />I went through most of the linked articles, but couldn't seem to find where you got the general FTP equation or the 20,900J/L O2 number from? You proposed 21.12 kJ/L O2 on a cyclingforums post from 2007, have you found this to be correct for VO2max figures?<br /><br />Cheers,<br /><br />Alexalex fieldhttp://www.blogger.com/profile/15505443387557827046noreply@blogger.com