I find that all too often distance coaches do not train speed "correctly." Correctly is a relative term as there are different ways to teach it but to train acceleration and maximum velocity, much recovery is needed between reps, and most distance coaches do not respect the amount of rest needed to properly train speed. To train speed, you should not be tired for the next rep, because if you are, you will not be able to accelerate as fast or reach maximum velocity with fatigued muscles. Training speed is not aerobic and even if you feel ready to go after the next rep, most likely you will still need to wait because speed training taxes the central nervous system and the neurosmuscular system. Therefore, full recoveries must be employed to get the most gains out of speed training.
A piece of literature I have found very helpful was written by Boo Schexnayder. His thoughts on acceleration development for the distance running state "Acceleration capabilities can be improved using acceleration development training. This training consists of short sprints in the 20-40 meter range. These should be run all-out, with recoveries long enough to guarantee that quality and intensity remain high throughout the session (1-2 minutes). Sessions should contain a total of 300-400 meters. Acceleration development training enables these athletes to shift gears in competition much more easily and economically. More importantly, acceleration development training is an important preparatory step for the speed development work that should follow it in the training calendar."
This means that acceleration development should come early in your season. A close relative to acceleration runs include resisted runs. Coach Schexnayder ideas on resisted runs: "While not a truly speed development, resisted sprints are close cousins in the speed development family. They are a good way to enhance acceleration and power capabilities. Dragging a sled or a tire, or uphill sprinting are typical ways to get this done. These are done full blast, and rests are sufficient to insure that intensity remains high throughout the workout (usually 1 ½ to 3 minutes). Distances used can range from 30-50 meters. Total session volumes should lie between 350 and 450 meters. These provide a nice contrasting effect to acceleration development sprinting."
A little later in the training session maximum velocity development should be incorporated. Mr. Schexnayder's ideas on maximum velocity development: "There is only one way to make athletes fast… allow them to run fast in training. The way to get an athlete faster is to allow them to reach and rehearse maximal velocity without using distances so long that fatigue produces deceleration as the end of the run approaches. For this reason, most speed development is done using top-speed sprints of 50-80 meters. Sprint-Float-Sprint or hollow sprint runs in the 80-90m meter range accomplish similar objectives. Once again, these efforts must be of maximal intensity, with recoveries long enough to insure intensity doesn’t fall during the session, usually 3-5 minutes. It’s about quality, not quantity, so total volumes should range from 400-550 meters."
Putting this all together in a progression, Coach Schexnayder states "Over the course of time, progress from acceleration development to speed development. Risk of injury in speed work is decreased with shorter efforts. For this reason, acceleration work is used to prepare the athlete’s body for speed development. Once new speed levels are developed, you can progress with other forms of training. In this speed training program, we will work from short to long."
He also touches upon many misconceptions about speed development that I touched upon at the beginning of this post. One misconception is that distance runners do not feel tired, so why wait so long before starting the next rep. His words include, "Well, after an acceleration or speed development session, distance athletes aren’t tired. At least not in the way we commonly understand “tired”. Speed development is about training the nervous system, and the nervous system responds only to high intensity. True, the combination of high intensities and long rest intervals means they won’t be anywhere close to vomiting after the workout. But the nervous system is extremely fatigued, which is what you are shooting for on these days. You can’t make someone faster while they are tired. Many coaches run sprints or strides after a workout to train “speed”. This does teach them something about finishing strong and kicking under conditions of fatigue, but it doesn’t increase their basic, fundamental speed capabilities. These speed levels can only be improved when athletes are fresh. To enable an athlete to sprint effectively when tired, they must first be taught to sprint effectively when not tired."
After acceleration development and maximum velocity development have been accomplished, the next progression is speed endurance work. Coach Schexnayder's words on speed endurance: "Speed endurance training is a natural extension of the previously discussed process of progressing form acceleration development to speed development. This type of work employs high intensity runs in the 100-150 meter range, usually 5-8 efforts per session. Recoveries must be long enough to insure the quality of work stays high throughout the session, usually 5-8 minutes. This type of work has a huge glycolytic component, so it’s not just about speed here."
After this development has taken place, it is now time for special endurance 1 and special endurance 2 workouts. This is a topic for another post and is getting away from speed, so that will have to be saved for another time.
I typically train athletes' speed by this short to long approach, one time per week. Another workout for the week will consist of training completely on the other side of the spectrum, with strength endurance work that consist of longer hill repeats, as well as marathon paced runs and lactate threshold runs-which I like to call tempo runs. I like to work both ends of the spectrum and slowly funnel the training toward specific race pace work. So during the general prep phase, athletes are developing these ends of the spectrum. During the specific prep phase, athletes are funneling their paces of workouts closer to race pace. And during the pre-competition phase, athletes are working specifically on race pace. And finally, during the main competition phase, the main theme is tapering and peaking, so it is all about feeling good at the end of the season.Training in this phase is really dropping volume and getting very specific with a lot of recovery to freshen up.
I hope this answers your question!