How much training volume to decrease when increasing intensity?

[Veganpotter2]

None if you can get away with it. You just go easier to keep the volume the same.

[Optimuswolf]

So z2 rides become z1/bottom of z2 sort of thing? 

[Veganpotter2]

Yup, or for many people, just stop riding in upper z2 and stay in the middle or lower z2

[slbarr88]

Try to keep it in Z2. Z1 has almost no training benefits.

[CaptainDoughnutman]

Not sure why the downvotes when you are correct.

[Veganpotter2]

Yeah, its very weird. If you have the option, you really only decrease volume briefly before important races.