calories

[dylankeyter]

how many calories do you burn on an intense ride. i am not sure how accurate mr hrm is but i burnt 3000 today!

[nellie]

where and how long did you ride?

[nellie]

But mine's +/-2750 on a DuToits-Bains trip (140kms, 2and a half passes in anything between 4.5-5.5 hours)

[dylankeyter]

about 85km, but was a mad ride. 180-190 bpm on the hillls

[dylankeyter]

hills being constantia nek, boyse drive and ou kaapse

[Quicksilv3r]

Nyc Did u do constantia nek afterwards?

[BikeMax]

A hard race or race effort of about 90km would give a 70kg rider about 1900 Kcals - if you weigh less than this then your energy requirement will be less.

[ZippIt]

A hard race or race effort of about 90km would give a 70kg rider about 1900 Kcals - if you weigh less than this then your energy requirement will be less.

 

so how much food is 1900 or say 2000Kcals equivalent to - about 10 jungle oats bars?

[BikeMax]

 

A hard race or race effort of about 90km would give a 70kg rider about 1900 Kcals - if you weigh less than this then your energy requirement will be less.

 

so how much food is 1900 or say 2000Kcals equivalent to - about 10 jungle oats bars?

 

Probably about that I would think.

 

[dylankeyter]

 

A hard race or race effort of about 90km would give a 70kg rider about 1900 Kcals - if you weigh less than this then your energy requirement will be less.

 

so is my hrm buggered?

 

[Mark]

Does it not have something to do with your VO2 Max settings?

[racman]

I used 2300 cal at WCE @89%HR (not accurate as estimated by Polar at  220-age I presume) but I am substantially heavier and more unfit.

[ZippIt]

A hard race or race effort of about 90km would give a 70kg rider about 1900 Kcals - if you weigh less than this then your energy requirement will be less.

 

so how much food is 1900 or say 2000Kcals equivalent to - about 10 jungle oats bars?

 

ok..so how many 340ml beers is that

[ZippIt]

polar measures calories using HR and a whole bunch of estimates.

[BikeMax]

 

To work out energy expenditure in joules, you multiply average power

(/1000) by time in seconds. Thus, the work done in 1-hr at 190 W avg is

684 kj (0.19 x 3600). To convert this to kcal you divide by 4.18, i.e.,

164 kcal.

 

 

 

However, the human body when cycling is only around 25% efficient

(normal range ~ 20 - 26%), thus, this needs to be calculated, to work

out the human energy consumption, i.e., 164 / 0.25 = 656 kcal.

 

 

 

To work out the exact amount of energy expended you'd need to go to a

sports science lab and have your expired air analysed. As a *good*

ballpark figure, it's best to estimate energy expenditure simply by

quoting the work done in kj as kcal, i.e., in the above example you would just say 684 kcal.

 

 

 

Efficiency changes with both cadence, and absolute power output, and

also with fatigue. At higher cadences, efficiency *decreases*, while at

higher powers it *increases*. As you fatigue efficiency decreases.

BikeMax2007-11-08 11:18:33

[Minion]

From the Polar site:

 

The energy expenditure calculation is based on:

• individual maximal oxygen uptake (VO_2max)

• individual maximum heart rate (HR_max)

• heart rate during exercise

• body weight

 

 

For receiving updated OwnCal_S information, the user is advised to update the VO_2max setting and the HR_max setting either with clinically measured values if available (for getting the most accurate OwnCal_S results) or update the settings in Fitness Test mode with OwnIndex and HR_max-p

OwnCalS basic information

 

So the calorie information is only really as accurate as the data you enter for VO2max, HRmax and weight (assuming HR measurement to be correct)