I can imagine it could be one of several things:
1) The ability of your heart/lungs/main arteries to absorb and transfer oxygen.
2) The ability of your working muscles to absorb this oxygen.
3) The efficiency with which your working muscles use the oxygen.
(others?)
I'm curious about the answer in general, but one reason I am asking is that
I have a large difference between my seated and standing FTP (with standing FTP higher) and I'm wondering what could cause this. For example, is my standing FTP limited by (1) but my seated FTP limited by (2) or (3)?
Also, is there a good current (scientifically current) book that I can read on this stuff?
1) The ability of your heart/lungs/main arteries to absorb and transfer oxygen.
2) The ability of your working muscles to absorb this oxygen.
3) The efficiency with which your working muscles use the oxygen.
(others?)
I'm curious about the answer in general, but one reason I am asking is that
I have a large difference between my seated and standing FTP (with standing FTP higher) and I'm wondering what could cause this. For example, is my standing FTP limited by (1) but my seated FTP limited by (2) or (3)?
Also, is there a good current (scientifically current) book that I can read on this stuff?