Tacx Sirius Trainer - How can I calculate speed? Calories etc?

Ky Abu

Hey

Just trying to figure this one out, maybe its very easy. I have just got a Tacx Sirius Trainer for my Defy 4, got it at a fairly good price (I think) of 100 euro.. I have a heart rate monitor (one with the chest strap)

How can I work out my speed?
I have a Union, Wireless Computer on the Front wheel, but I dont want to go messing about with that.


Is it as simple as putting a Wired Computer on the back wheel?

Or is it even advisable to put it on the back wheel?

Or am I better off working to the heart rate ?


Or... is there an even easier solution?

cjodea

Ideally you want to be working to both heart-rate and cadence.

Ryder

100e was very good value. Have the same one. Wouldnt bother with speed....will depend on resistance setting, tyre pressure and contact pressure from the roller...so will vary too much. Cadence and hr are more than enough

Ky Abu

cjodea wrote: »

Ideally you want to be working to both heart-rate and cadence.

How do I measure candence? Its basically the amount of crank rotations per minute ya? Candence and Heart Rate I presume is on the better Cycle Computers?

Ryder

Ky Abu wrote: »

How do I measure candence? Its basically the amount of crank rotations per minute ya? Candence and Heart Rate I presume is on the better Cycle Computers?

yes and yes. Cadence isnt even near essential, but is useful. Just multiply the number of revs in 15s by 4. Aim for greater than 90 (ideal, but some do better with a slightly lower cadence of 80-90)

Paul Kiernan

AFAIK, you'll burn between 7 calories per minute at about 50% of your max heart rate up to about 15 per minute at 90%.

At lower level the calories will come mainly from body fat while at upper end it'll all be from your blood sugar.

Ky Abu

Ryder wrote: »

yes and yes. Cadence isnt even near essential, but is useful. Just multiply the number of revs in 15s by 4. Aim for greater than 90 (ideal, but some do better with a slightly lower cadence of 80-90)

Oh.. that sounds very simple, why didnt I think of that! Haha...

Ky Abu

Paul Kiernan wrote: »

AFAIK, you'll burn between 7 calories per minute at about 50% of your max heart rate up to about 15 per minute at 90%.

At lower level the calories will come mainly from body fat while at upper end it'll all be from your blood sugar.

Wel its body fat I presume I want to work on to lose some weight..

Lumen

Ky Abu wrote: »

Oh.. that sounds very simple, why didnt I think of that! Haha...

Unfortunately it's also completely inaccurate. Calorie and HR are correlated with perhaps acceptable accuracy (diet wise) for one individual, but calorie consumption varies massively between different cyclists for the same relative HR, to the point where it's not at all useful.

Ryder

Lumen wrote: »

Unfortunately it's also completely inaccurate. Calorie and HR are correlated with perhaps acceptable accuracy (diet wise) for one individual, but calorie consumption varies massively between different cyclists for the same relative HR, to the point where it's not at all useful.

not sure that thats fair......the calories calculated by hr arent useful as an absolute number but are a cheap and effective way of gauging effort from one workout to another.

Hr is also useful to gauge the correct intensity of exercise

Lumen

Ryder wrote: »

not sure that thats fair......the calories calculated by hr arent useful as an absolute number but are a cheap and effective way of gauging effort from one workout to another.

Hr is also useful to gauge the correct intensity of exercise

Sure, but I was responding to an assertion about calorie counting.

Ryder

Lumen wrote: »

Unfortunately it's also completely inaccurate. Calorie and HR are correlated with perhaps acceptable accuracy (diet wise) for one individual, but calorie consumption varies massively between different cyclists for the same relative HR, to the point where it's not at all useful.

Lumen wrote: »

Sure, but I was responding to an assertion about calorie counting.

fair enough