As a follow-on to the discussion about lactate testing in rowing I would encourage readers to have a look at Olympic Champion Xeno Muller's blog "Indoor Rowing."
Xeno is a believer in lactate testing and his postings have a number of useful comments attached. In the linked post, Xeno poses the question "why don't more rowers use lactate testing?" which was also raised in the comments in this blog.
Go to Xeno's blog and use the search feature for more links on lactate testing and rowing. He believes in it. He has lived it. Obviously it worked for him.
When you go - please come back and drop in a comment about what you have read.