Which goes back to the issue regarding the Peaking video!
In my female soccer players, we start out doing 110yds in 18 seconds for faster players (about 20 seconds for slower players. After about 3 weeks, these become very easy to do, and we move up 1 second for these reps. Because they will hit 4000m+ of tempo 3x a week (12,000m total), the 17 second zone is fine. For males, I usually ask them to run it in 15-16 seconds. Early off-season I may ask them to run them in 17 and decrease time as they get more fit.
Re: tempo and lactic acid…the point of tmepo is to aid in recovery, not to work on lactic type conditioning. This goes back to the Vancouver download of team sports.
How many sports really need lactic type workouts?