Thanks, good discussion to be involved in!

You’ll have to forgive me for not getting involved in the coming days – I’m away overseas and with limited access, so I may suddenly vanish!

But keep the thoughts going!

Ross

Thanks for clearing this also.

Ross – not too shabby – for a Cape Town boytjie

Been real impressed with your – degree – of participation here at RW.

Very quickly, because I’m in the airport, about to board a flight:

The g-force measurements are not made using your normal, commercially available GPS, because as fyndraai has said, that’s not quite accurate enough to track changes in speed and direction over those small distances/times.

So the device has a GPS, but it also has an accelerometer, which is able to track instant changes in speed and direction, and that’s where the measurement comes from.

Re the energy, yes, it’s calculated using a built-in heart rate monitor (so the device has 3 components – GPS, accelerometry and heart rate). Energy expenditure is relatively accurate when calculated during exercise in this way. There is of course error, but even if it was 5%, the value would still be in the same magnitude of 2000 kCal.

Ciao!
Ross

Human beings are extremely diverse.

Even heart rate measurement not as clear cut as the fitness ‘gurus’ would like you to believe. But close enough I suppose.

2000 Calories = 20 Bananas
1 Calorie = 1kCal

Reading it again I see they also have heart rate and energy consumed, so it is fair to assume they had at least heart rate monitors and accelerometers in addition to the GPS.

Does anybody know how they measure energy consumed?
Is it calculated from heart rate?

“…..a loose forward can expect to burn about 2000 kCal….”

According to this a banana has 105Cal
http://caloriecount.about.com/calories-banana-i69599

So does a loose forward consume the equivalent of 20000 bananas in a game?

This cannot be correct. Or does a banana actually have 105kCal and 1 Calorie = 1kCal?

Belangriker nog, weet waar jy vandaan gekom het.

Don’t leave home without a map, is wat ek se.

Currently we have 31.

If we go below 24 we will all be lost.