My journal revealed many factors that may have given me swift feet in spring & summer - twice per day runs two times per week, hill repeats, trail running, and of course, I was relatively fresh as I was in the first half of the training year. The most glaring contributor to my slowing pace of the past 6-8 weeks is the melting of all runs into moderate effort runs. My speed work was no longer fast enough, my recovery and long runs not slow enough, and eventually this led to my body getting stuck in middle gear. This is a common trap many runners fall into. When pushing too hard in easy runs (which, as you will read below, should be the majority of runs), over time the moderate level effort (just below the lactate threshold) becomes exponentially more taxing on the sympathetic nervous system, creating a burden of fatigue in which running faster, attaining PR's or performance goals, becomes more difficult.
To remedy this situation (I hope!), I'm turning to the 80/10/10 training principle. This means 80% of my runs should be easy or within Zone 2 of the Heart Rate (HR) chart (see below). This allows my body to recover quickly, while still expanding my aerobic base. It also teaches my body to use fat for fuel for the long haul, rather than banking on glycogen (sugar), which can lead to bonking. Doing most runs slow, contrary to what one might expect, does not make you a slow runner. It allows your body to adapt and grow at a healthy rate that can support your fast runs. Fast running, such as tempo runs, should comprise 10% of my running volume in the HR Zone 3 and the final 10%, to include high intensity interval training can dip into the anaerobic thresholds of Zones 4 & 5. Research notes, "One study involving Spanish runners found that those who did 80 percent of their training below the lactate threshold (LT), 10 percent at LT and 10 percent above LT improved their race times significantly more in five months than runners who did the same amount ofrunning but performed only 70 percent of it below LT, 20 percent at LT and 10 percent above LT."
Following HR Zone guidelines is a good way to insure you're running your easy runs easy and hard runs hard. Do the HR numbers need to be adhered to religiously? No, but keeping an awareness of them, as well as running by feel (i.e., can I easily conversate?), will greatly help me stick with my off season plan. The easiest, most common way to figure out HR Zones relates to a basic formula of subtracting your age from 220 and then multiplying that number by.60 to know your Zone1/2 range, by .70 to know your Zone 2/3 range, etc., but this method fails to accommodate the highly fit athlete. To get a more accurate suggestion of HR ranges I will use the Karvonen system, which begins by my checking my HR immediately upon waking (while still lying in bed - count your heart beats for 20 seconds and multiply by 3, or count your heart beats for 1 minute) for three consecutive mornings. I then plug the average of those numbers into a formula that will give me HR guidelines.
Zone 1
– 50-60% of max heart rate. This zone corresponds to an athlete’s aerobic base and is typically reserved for a warmup and cooldown.
Zone 2
– 60-70% of max heart rate. This is an aerobic zone where an athlete can run comfortably and utilize fat as a primary fuel source. Conversation should be relatively easy.
Zone 3
– 70-80% of max heart rate. This is the last aerobic zone before crossing the anaerobic threshold. Training in this zone is challenging but sustainable for most athletes.
Zone 4
– 80-90% of max heart rate. This is an anaerobic zone which by definition implies the absence of O2 resulting in a negligible amount of fat metabolism. Therefore, our bodies are primarily using carbohydrates as a fuel source. Athletes in Zone 4 may mutter only a few words at a time.
Zone 5
– 90-100% of max heart rate. This is the top of the heart rate chain and leaves you gasping for air after only 10 to 20 seconds of work.
My two post race recovery weeks are the perfect time to start slowing down my runs. This will aid my physical recovery, while mentally letting me accept the slower pace as beneficial (this means combating my fears that running slow will make me lose my gains of the past year). When this second week of recovery ends, I will reintroduce some light speed work once a week (as opposed to twice per week) and spend more time cross training til the end of the year.
If this blog was too technical and dull for your liking, I promise to spice up the next one with the scoop on our 2015 adventures!
P.S. This week Joe crossed over the 1,000 mile mark and I crossed over the 1,200 mile mark!


