Here's a well written paper discussing specific training to target MCT-1 and MCT-3 lactate transporters, the goal being to reduce lactic acid buildup and thus increase LT. It's geared for elite distance swimmers, but IMHO it is still a very interesting read with some good references.
http://www.swimmingcoach.org/wsca/WSCA_news/wscanl2-00.pdf
I've incorporated some of the general principles into my own training plan (following a base period).. I.e. short hard intervals like 30/30's (targeting mct-3) on Tuesdays and threshold work (targeting mct-1) on Thursdays. Racing or long ride on the weekend, and endurance or recovery rides on the other weekdays. Not sure if there's any correlation, but my racing is going very well so far this season. 🙂
I think the 30/30's (A set alternates 30sec@max with 30sec@rest, repeated 3 or 4 times. 4 or 5 sets comprise a workout, in my case.) are the single biggest reason for my improvement this year. I know I get a lot of high quality work in at a lower perceived effort than the longer 4 or 5 minute intervals, but that's just me.
Would be curious to hear others' thoughts on this angle to training (I.e. lactate taxi system model of controlling lactic acid buildup).
BTW, being new here.. this board is awesome! So many knowledgeable folks willing to share.. 🙂
-Ron