What This All Means
So where does this leave us? We know that it is impossible to consistently train precisely at lactate threshold intensity, no matter how hard we try. We know that nothing magical happens at this intensity anyway. And we know that training at intensities slightly above and below the lactate threshold is equally beneficial in somewhat different ways.
In my view, there are several practical implications of this knowledge. First, you need not bother figuring out what your lactate threshold heart rate or running pace is. Instead, keep it simple and base your threshold workout intensities on your performance profile, or how fast you can run in races. Second, don’t target a single intensity all the time in your threshold workouts. Instead, do threshold workouts at a variety of pace levels within a range.
Brad Hudson, an elite running coach with whom I co-authored the book Run Faster from the 5K to the Marathon, has his runners target their marathon pace, half-marathon pace and 10K pace in threshold workouts. That makes sense to me.
RELATED: Half-Marathon Training
There are two other things we know about lactate threshold training that should also be factored into your approach to threshold workouts. First, training at or near lactate threshold speed increases one’s time limit at lactate threshold speed (that is, how long you can sustain this velocity) to a far greater degree than it increases lactate threshold speed itself. Second, a modest amount of threshold training is better than a lot. In a well-designed, long-term study involving high-level runners, those who did one threshold workout per week improved more than those who did two.
Finally, I hold a belief that every runner should do some amount of threshold training throughout the training cycle. Doing just a mile or two of threshold running each week even in the early base phase of training will enable you to develop this aspect of your overall fitness faster and to a higher level once you get serious about it. A good way to start is with progression runs, in which you run a few easy miles and then run a mile or two at your marathon pace (not the pace at which you would run a marathon today but the pace at which you would run a marathon in peak shape, or 11-12 percent slower than your best 10K race pace).
After doing a few such runs, begin extending the progressions a bit and including some half-marathon-pace running (5-6 percent slower than your best 10K pace) within them. Your toughest progression run should not be particularly challenging-say, 4-8 easy miles followed by 1.5 miles at marathon pace and 1.5 miles at half-marathon pace. When you reach this level, it’s time to switch over to formal threshold workouts.
The precise structure of these workouts doesn’t matter. Precision in general is overrated in training. It’s the direction, or evolution, of your threshold workouts that matters. Simply put, your threshold workouts should evolve in the direction of becoming more race-specific in the challenge they impose. The general idea is to gradually increase the duration you can sustain your peak marathon, half-marathon and 10K race pace by gradually increasing the amount of time you spend running at these pace levels in your threshold workouts. This approach will also serve to gradually close the gap between your current and peak marathon, half-marathon and 10K race paces.
If you’re training for 5K and 10K events, emphasize marathon pace in your earliest threshold runs and then shift the emphasis to half-marathon pace and finally 10K pace, which is the most race-specific of the three thresholds. If you’re training for half-marathon events, maintain a more even balance among the three thresholds, with a modest prioritization of marathon pace and 10K pace over half-marathon pace until the final six weeks before competition, when half-marathon pace should get the priority. If you’re training for a marathon, emphasize 10K pace in your earliest threshold runs, then half-marathon pace and finally marathon pace.
If you’re a slower runner, you should bias your training a little more toward half-marathon and 10K pace. That’s because slower runners can handle more training at these pace levels than faster runners, as these pace levels represent a lower relative intensity for slower runners. For example, 10K pace corresponds to roughly 95 percent of VO2max for a 33-minute 10K runner, but only 85 percent of VO2max for a 60-minute 10K runner. We can’t ignore physiology completely.
About The Author:
Matt Fitzgerald is the author of numerous books, including Racing Weight: How To Get Lean For Peak Performance (VeloPress, 2012). He is also a Training Intelligence Specialist for PEAR Sports. To learn more about Matt visit www.mattfitzgerald.org.