max o2?

[acoggan]

If you used a 15sec sample periods then you can easily get a single value well above the true VO2max because there is a lag between ventilation and the appropriate mixed expired gas concentrations. ie: a sudden increase in ventilation will temporarily overestimate the VO2 if a short sample period is used because the mixed expired gas fractions haven't had time to "catch up" to the increase in Ve.

The better systems take this sample transit time into consideration (as well as the phase of respiration).

That said, short time intervals will still lead to more sample-to-sample variability, which in turn means a higher calculated VO2max (since you're looking for the highest value).

 

[acoggan]

In your opinion could these results be real?

Impossible to say, really, at least based on the information available to us.

 

[Krebs cycle]

The better systems take this sample transit time into consideration (as well as the phase of respiration).

That said, short time intervals will still lead to more sample-to-sample variability, which in turn means a higher calculated VO2max (since you're looking for the highest value).

Maybe the lad just had a pericardiectomy and then did LHTL?

 

[Markyboyzx6r]

The better systems take this sample transit time into consideration (as well as the phase of respiration).

That said, short time intervals will still lead to more sample-to-sample variability, which in turn means a higher calculated VO2max (since you're looking for the highest value).

Indeed. We use Carefusion Masterscreen CPX (or the Jaeger as I call it, showing my age). We tend to use shorter sampling times for calculating max VO2, cause of the patient population we test. Most of the people I test are heart failure patients who struggle to get above 15ml/kg/min!

acoggan - am I right in saying that you'll get higher VO2max settings with elite athletes if they are using an ergometer specific to their sport (i.e. rowers get higher values on a C2 than they would on an SRM ergo?). With the people I test it's much less relevant - we use the cycle ergo rather than the treadmill to get accurate work rate - delta HR/VO2 etc numbers.

If I had to go back to using Douglas bags these days I'd be stuffed. Wouldn't remember what to do. However, the problem with these easy-to-use cardiopulmonary carts these days is that calibration is easy, and if it's easy than you're more likely to lose that quality control unless you put specific measures in place.

Getting back to our Norway example - it should be clear that such is the quantity of variables in testing - the last question we can be sure about is the question of accuracy. Therefore I would not raise the spectre of doping as there are lots of factors upstream from the subject that you'd need to be clear upon before you postulate about the subject himself.

 

[Alex Simmons/RST]

Why is this thread in the clinic?

 

[Markyboyzx6r]

Why is this thread in the clinic?

I don't think the thread went in the direction the OP intended. We CPX geeks took it over and killed the interest!

 

[Cloxxki]

Though I don't think vo2max is that important in XC skiing.

Interesting thought.
When I ski, especially a race, I just don't know where to get my oxygen from. I get so exhausted aerobically it's hard to stay upright.
I am a former MTB racer, my races were 1 hour on average. My VO2 max was 506W in January med test. A 82kg guy (at the time) who would actually get over hills and mountains with the short skinny dudes. In my experience VO2 is nearly EVERYTHING in XC skiing.
I own a SkiErg trainer. It mimics the double pole action nicely. Takes no time at all to get the heart into panic mode. A 5k (18'00 at 87kg) road run race is a lazy walk in the park compared to a ski race of any duration.

Your mileage may vary

 

[ToreBear]

Interesting thought.
When I ski, especially a race, I just don't know where to get my oxygen from. I get so exhausted aerobically it's hard to stay upright.
I am a former MTB racer, my races were 1 hour on average. My VO2 max was 506W in January med test. A 82kg guy (at the time) who would actually get over hills and mountains with the short skinny dudes. In my experience VO2 is nearly EVERYTHING in XC skiing.
I own a SkiErg trainer. It mimics the double pole action nicely. Takes no time at all to get the heart into panic mode. A 5k (18'00 at 87kg) road run race is a lazy walk in the park compared to a ski race of any duration.

Your mileage may vary

You may know more about this than me. I just read through some of the info on xc skiing in the link Animal posted, and my memory in regards to commentary on TV during races.

I think the stroke volume of the heart and the ability to tolerate high levels of lactate over time are more important factors. But of course if you are skiing up Alpe Cermis vo2max might become a major factor. But of course weight would perhaps be an even bigger one.

Also there is a difference in the use of the upper body vs the lower body.

And if you are not comfortable in your tecknique, and begin to stress, your heart might start to pump faster than your lungs can put oxygen in your blood. But remember I'm talking about the very top in world cup skiing and the courses they use.

What does VO2 max of 506W translate to in regards to the numbers we use in this thread by the way?

Again, I'm no expert, just a fan.