[i]Originally posted by danimal9[/i]
but I cannot see how 90 seconds is a short rest interval for 30m of work. To some extent I can see your point, but creatine phosphate stores should be able to replinish themselves within a minute.
For me personally, 90s is on the fringe of not being enough rest for 30m. I prefer to err on the conservative side. Typically to be safe I use the general guideline of 45-60s rest for every 10m of all-out sprinting with speed rather than endurance as the focus (i.e. when working on speed through acceleration development, maxV development or even short speed endurance). I do this to ensure fatigue is not an issue whatsoever and athletes are able to perform at maximal levels for the whole workout. If things are planned right, their should be virtually no drop off in performance from the first rep to the last.