commuting
12-03-13 | 05:48 PM
#26
Banned
Joined: Jul 2010
Posts: 8,543
Likes: 41
From: England / CPH
Bikes: 2010 Cube Acid / 2013 Mango FGSS
Idk... internet somewhere. It must be accurate.
https://www.ncbi.nlm.nih.gov/pubmed/18803095 efficiency = 0.257 ± 0.0245
https://www.ncbi.nlm.nih.gov/pmc/arti...394253/?page=4 efficiency = 26.1%
Random term paper I found cited 22% - 26% from:
Prempero, Pietro. “Cycling on Earth, in Space, on the Moon.” European Journal of Applied Physiology, 2000, 82: 345-360
Using 26% from the first 2 sources that closer agree:
1 kJ = 4.2 kcal, so accounting for human metabolic efficiency on the bike, 1 kJ → 1.09 kcal
https://www.ncbi.nlm.nih.gov/pubmed/18803095 efficiency = 0.257 ± 0.0245
https://www.ncbi.nlm.nih.gov/pmc/arti...394253/?page=4 efficiency = 26.1%
Random term paper I found cited 22% - 26% from:
Prempero, Pietro. “Cycling on Earth, in Space, on the Moon.” European Journal of Applied Physiology, 2000, 82: 345-360
Using 26% from the first 2 sources that closer agree:
1 kJ = 4.2 kcal, so accounting for human metabolic efficiency on the bike, 1 kJ → 1.09 kcal
i'm not super convinced by strava and wonder what kind of power i really am putting down.
12-03-13 | 06:08 PM
#27
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Joined: Aug 2013
Posts: 3,462
Likes: 65
From: SF, CA
Bikes: Cervelo S5, Marin Gestalt X11
12-03-13 | 06:20 PM
#28
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Joined: Jul 2002
Posts: 40,863
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From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Strava does a relatively good job on solo, long, moderate climbs with no wind. It's absolutely useless in a group ride on flat land.
12-03-13 | 06:23 PM
#30
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Joined: Jul 2010
Posts: 8,543
Likes: 41
From: England / CPH
Bikes: 2010 Cube Acid / 2013 Mango FGSS
i'm just more curious from a nutritional standpoint what i'm burning. i guess 300±100 kcal.
12-03-13 | 06:37 PM
#31
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Joined: Aug 2013
Posts: 3,462
Likes: 65
From: SF, CA
Bikes: Cervelo S5, Marin Gestalt X11
Assume on the easy end:
Crr = 0.0033
CdA = 0.33
Tailwind = 5mph
Grade = -0.3%
Power = 67.7 watts, energy = 1.1*67.7*60*40 = 179 kcal
Assume on the hard end:
Crr = 0.0038
CdA = 0.38
Headwind = 5mph
Grade = +0.3%
Power = 277.9 watts, energy = 1.1*277.9*60*40 = 734 kcal
So, calories burned = 457±278
(Also assuming 95% efficiency in bicycle)
Last edited by aaronmcd; 12-03-13 at 06:44 PM.
12-03-13 | 06:41 PM
#32
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Joined: Jan 2011
Posts: 4,267
Likes: 7
From: NA
Bikes: NA
Since my commute is very short (10 miles total) I tend to cycle more vigorously than on training rides. I burn about ~800-900 calories a day commuting (800 foot elevation gain - 190 lbs - 20ish rolling average).
Last edited by spare_wheel; 12-03-13 at 06:58 PM.
12-03-13 | 07:44 PM
#33
Senior Member
Joined: Sep 2013
Posts: 1,050
Likes: 0
From: Memphis, TN
I can never get these calculations to match my actual experience. I seem to need fewer calories than the calculators say I should and burn fewer than they say I do. About 12 years ago I needed to lose some weight, about 25 pounds. The calculators were helpful for giving me a sense of what to aim for. When I realized I couldn't eat what they said I could, I adjusted downward until I found the sweet spot. I lost 20 pounds and maintained that for 12 years. Never could drop that last 5 pounds. Until now. I started bike commuting 12 miles r/t each day back in September. I haven't changed anything else and the five pounds is gone. Just like that.
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