it's genetic wrote:
Andrew Coggan wrote:
1. There is no assumption in the conclusion that endurance exercise training increases maximal cardiac output.
2. Plasma volume shifts with exercise (which do occur) are just another of your red herrings.
3. The way you know that VO2max has been tested "properly" is to get a PhD in exercise physiology, then apply what you have learned (including the standard criteria for establishment of VO2max).
4. The same is true for maximal heart rate (and since when in Joe Friel an expert in exercise physiology??).
5. To repeat: there is nothing "delusional or disingenuous" about stating that, in fact, endurance exercise training increases both maximal cardiac output and absolute VO2max (i.e., in L/min).
6. VO2max reflects the combination of SV, HR, and a-vO2 diff. It should therefore be obvious that there are multiple ways to achieve the same value.
1, You are making assumptions. Cardiac output has to be maintained in a healthy heart. Saying that maximal cardiac output can be increased with training is like saying that lung capacity can be increased with training. But lung capacity is easy to measure. How can you be sure you can measure maximal cardiac output correctly? How do you account for changes in peripheral resistance? Leave it to the Cardiologists to work out, it's their job and they are accountable for their actions. Coaching shouldn't involve such vague premises or promises. Maximal Cardiac Output is genetically determined and is maintained by good health. To state otherwise is a very contentious issue. Young people have higher absolute values for VO2 max and it declines with age despite increases in Stroke Volume. Do you deny this?
2, Plasma volume shifts are not a red herring, you're just prevaricating.
3, If you are measuring VO2 max, do you measure the sweat rate?
4, If you measure Maximal heart rate, do you take into account the fact that it has a seasonal variation of 8-10 bpm in some subjects as Joe Friel points out? And he even explains why, it's due to changes in plasma volume.
5, Exercise physiologists make many fantastic claims and many of these become 'conventional wisdom'. Is it unreasonable to suggest you don't do the same?
6, "VO2max reflects the combination of SV, HR, and a-vO2 diff. It should therefore be obvious that there are multiple ways to achieve the same value"
SV, HR and a-v02 are all variable. Be careful not to make too many assumptions about how you believe they can all be increased at the same time.
For example, does SV increase then plateau or increase steadily up to an observed VO2 max? And does an individual experience both these two traits in different conditions. For example, how does heat stress affect the test?