Power Meter Puzzler
1 Attachment(s)
How can you have two rides of equal duration (50 minutes), both indoors on a trainer using the exact same equipment, where you go farther (i.e. faster) on one, yet produce fewer Kilojoules (i.e. less work)? Here are the particulars:
Jan 24- 12.8 miles, Avg power 127, Normalized power 165.... 413 Kj Feb 2- 13.3 miles, Avg power 136, Normalized power 149.... 408 Kj Jan 24 ride was a series of 1-minute intervals Feb 2 ride was a set of 5 minute intervals. http://bikeforums.net/attachment.php...hmentid=236144 Perhaps I do not understand Kilojoules... can someone please clarify? |
Possible explanation #1: power and effort do not increase in a linear fashion, so doing those 1 minute power intervals averages out a little higher.
Possible explanation #2: those numbers are well within the margin of error. |
Originally Posted by Nikephoros
(Post 13811316)
Possible explanation #1: power and effort do not increase in a linear fashion, so doing those 1 minute power intervals averages out a little higher.
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Or in another way of saying... your burnt energy vs. work performed is not linear depending on level of effort. (Guess that's why you train for efficiency on certain discipline).
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Originally Posted by billydonn
(Post 13810507)
How can you have two rides of equal duration (50 minutes), both indoors on a trainer using the exact same equipment, where you go farther (i.e. faster) on one, yet produce fewer Kilojoules (i.e. less work)? Here are the particulars:
Jan 24- 12.8 miles, Avg power 127, Normalized power 165.... 413 Kj Feb 2- 13.3 miles, Avg power 136, Normalized power 149.... 408 Kj So the question is where did your 413 kJ number come from? |
1 Attachment(s)
Originally Posted by asgelle
(Post 13812521)
Work (J) equals power (W) times time (s). It doesn't matter how the power was applied; total work is the integral of instantaneous power over the duration of exercise (i.e., linear). For the two cases, 127 W over 49:56 (2996 seconds) is 380.5 kJ. 136 W gives 408 kJ.
So the question is where did your 413 kJ number come from? http://bikeforums.net/attachment.php...hmentid=236235 |
Originally Posted by billydonn
(Post 13813066)
It comes from here... it is from Cycleops Power Agent software. it was attached to my post but here it is again:
http://bikeforums.net/attachment.php...hmentid=236235 |
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