Question on weight and VO2 max

Don?t think so...

VO2max is the maximum rate of oxygen consumption and measured here in milliliter of oxygen per kg of body mass per minute - mL/(kg*min)

Hence same oxygen consumption with less weight gives higher VO2max. Speed got nothing to do with it...

J.

same oxygen consumption with less weight gives higher VO2max.

Gives higher relative VO[SUB]2max[/SUB]. The absolute VO[SUB]2max[/SUB] is unchanged.

Speed got nothing to do with it...

When measuring VO2max directly then you're right. But a garmin wearable has no way of measuring the capabilities of your lungs! Instead it uses a fancy algorithm which DOES NOT MEASURE VO2max, but does a GUESSTIMATE, and that guesstimate is based on many parameters and speed is one of the most essential.

The definition of the parameter is clear and unambiguous.
Yes, there are many ways to estimate it but thats a different story. Thats all I tried to state.
J.

Well I imagine if you went for a "proper" VO2 Max test then they would weigh you there and then before you start the test and not rely on some measurement you have told them. That said you could argue it would be prudent to weigh you again directly after the test concludes as you may well have lost some weight in sweat during the maximal effort you would have had to have put in. Interesting point as to which is more appropriate.

On the watch notice that if you change your weight then VO2 Max does not instantly change whereas it effectively would in a lab test if say they had used an incorrect weight to obtain your relative VO2 Max (analogous to the one on the watch) from your absolute VO2 Max which is directly measurable by the lab test.

I assume that if you change your weight on the watch then the algorithm will adjust over your next few activities as it sort of relearns you. If that difference is only 1 or 2 kg then there may well be no obvious change in VO2 Max especially as that is only given to an integer.

In terms of what weight to put into the watch then I would use the morning one else you kind of feel that you are weighing your evening meal and drinks! Also like VO2 Max you can only enter an integer for weight so I tend not to adjust my weight unless I am sure I am consistently seeing a different value for a few days.

Three threads effectively running at the same time, discussing the same thing.

Read this- https://www.firstbeat.com/en/consumer-feature/vo2max-fitness-level/

Weight is a factor used in the calculation of VO[SUB]2max[/SUB] on the watch. You can manipulate your VO[SUB]2max [/SUB]by changing your weight and your max heart rate. Enter the values at the same time each day. It won't make any real difference to the trend over time.

The formulas used by Firstbeat are proprietary so only Firstbeat knows exactly how the number is derived. They do suggest 95% accuracy. However, I'm not sure if that's been tested independently. I can say, from my experience that it's good enough. The absolute value of the number does not really matter, except for bragging rights. What really matters is how that number responds to your training over time.