Prev: Cunting lorry drivers.
Next: Britain's scariest roads
From: Rob Morley on 6 Dec 2009 09:28 On Sun, 6 Dec 2009 14:12:28 -0000 "mileburner" <mileburner(a)btinternet.com> wrote: > You must be fit if you can run to ASDA at 12mph. I would be lucky to > manage it at 7mph. I'd be lucky to make it there at 7mph and not be on crutches for a few weeks afterwards, but I was pretending that I'm not unfit with a knackered knee.
From: MasonS on 6 Dec 2009 09:29 On 6 Dec, 14:19, Ian Dalziel <iandalz...(a)lineone.net> wrote: > On Sun, 06 Dec 2009 13:12:08 GMT, Strangely Composed > > > > > > <h...(a)there.nowhere> wrote: > >If you're going to quibble... Ian Dalziel said: > > >>>> Cycling does not require more energy than walking. > > >>>Even if you assume cycling at walking pace the cyclist still has to move > >>>the mass of the bike as well as him/herself, which will take more > >>>energy. > > >>>There is also additional energy required to overcome the friction > >>>inherent in the mechanisms of the cycle. > > >>>As cyclists tend to move faster than walkers other factors such as > >>>overcoming wind resistance and kinetic energy conversion. > > >> You're using the energy to *accelerate* the mass. Try this - a bike and > >> a runner set off from the same point and accelerate to the same speed. > >> Then, simultaneously, the runner stops running and the cyclist stops > >> pedalling. Will they cover the same distance? > > >That largely depends on whether or not the cyclist & runner accelerate > >and decelerate at the same rate. If they do then they will cover the same > >distance. > > >If you assume the walker & cyclist are the same weight then the cyclist > >has to use more energy to accelerate not only his own mass but the mass > >of the cycle as well. > > Indeed. Then once he's accelerated, the effects of this "wheel" thing > which you seem not to have heard of come into play. I think you'll > find a rolling cycle does not decelerate at the same rate as a > pedestrian. > > -- > > Ian D- Hide quoted text - > > - Show quoted text - When I used to run, my Max Heart Rate would be 185 when running at 12 mph. 1
From: Conor on 6 Dec 2009 09:29 In article <17ada0b0-5650-4673-aa7f- ff7c5c12785d(a)g31g2000vbr.googlegroups.com>, MasonS(a)BP.com says... > > On 6 Dec, 13:22, Conor <co...(a)gmx.co.uk> wrote: > > In article <9794ca9a-552a-4520-a03e-618921e70364 > > @x16g2000vbk.googlegroups.com>, Mas...(a)BP.com says... > > > > > Don't car drivers have to eat as well? > > > > Not to replace energy used to transport themselves. > > > > > Stop clutching at straws. > > > > You should. > > > > -- > > Conorwww.notebooks-r-us.co.uk > > > > I'm not prejudiced. I hate everybody equally. > > I eat about 2500 calories a day So 25% more than the recommended daily allowance. > and am around 12 stone. So underweight most likely. -- Conor www.notebooks-r-us.co.uk I'm not prejudiced. I hate everybody equally.
From: MasonS on 6 Dec 2009 09:33 On 6 Dec, 14:19, Ian Dalziel <iandalz...(a)lineone.net> wrote: > On Sun, 06 Dec 2009 13:12:08 GMT, Strangely Composed > > > > > > <h...(a)there.nowhere> wrote: > >If you're going to quibble... Ian Dalziel said: > > >>>> Cycling does not require more energy than walking. > > >>>Even if you assume cycling at walking pace the cyclist still has to move > >>>the mass of the bike as well as him/herself, which will take more > >>>energy. > > >>>There is also additional energy required to overcome the friction > >>>inherent in the mechanisms of the cycle. > > >>>As cyclists tend to move faster than walkers other factors such as > >>>overcoming wind resistance and kinetic energy conversion. > > >> You're using the energy to *accelerate* the mass. Try this - a bike and > >> a runner set off from the same point and accelerate to the same speed. > >> Then, simultaneously, the runner stops running and the cyclist stops > >> pedalling. Will they cover the same distance? > > >That largely depends on whether or not the cyclist & runner accelerate > >and decelerate at the same rate. If they do then they will cover the same > >distance. > > >If you assume the walker & cyclist are the same weight then the cyclist > >has to use more energy to accelerate not only his own mass but the mass > >of the cycle as well. > > Indeed. Then once he's accelerated, the effects of this "wheel" thing > which you seem not to have heard of come into play. I think you'll > find a rolling cycle does not decelerate at the same rate as a > pedestrian. > > -- > > Ian D- Hide quoted text - > > - Show quoted text - When I used to run, at 12 mph my Max Heart Rate was 185 bpm. 10 years later I can cycle on the flat at 20 mph and my heart rate barely gets to 120 bpm. It is obvious that a cyclist uses fewer calories. Obvious unless you are trying to point the finger at a cyclist breathing while driving a 4 litre truck doing 15 mpg. -- Simon Mason
From: MasonS on 6 Dec 2009 09:42
On 6 Dec, 14:29, Conor <co...(a)gmx.co.uk> wrote: > In article <17ada0b0-5650-4673-aa7f- > ff7c5c127...(a)g31g2000vbr.googlegroups.com>, Mas...(a)BP.com says... > > > > > > > > > On 6 Dec, 13:22, Conor <co...(a)gmx.co.uk> wrote: > > > In article <9794ca9a-552a-4520-a03e-618921e70364 > > > @x16g2000vbk.googlegroups.com>, Mas...(a)BP.com says... > > > > > Don't car drivers have to eat as well? > > > > Not to replace energy used to transport themselves. > > > > > Stop clutching at straws. > > > > You should. > > > > -- > > > Conorwww.notebooks-r-us.co.uk > > > > I'm not prejudiced. I hate everybody equally. > > > I eat about 2500 calories a day > > So 25% more than the recommended daily allowance. > > > and am around 12 stone. > > So underweight most likely. > > -- > Conorwww.notebooks-r-us.co.uk > > I'm not prejudiced. I hate everybody equally.- Hide quoted text - > > - Show quoted text - I am 6ft 1ins so have a BMI of 22.1. Underweight is 19 or lower, so I am normal, not underweight. -- Simon Mason |