Sunday, April 08, 2012

Sporty Sunday: RLRF Track Repeats

The first of the Run Less Run Faster program’s three key runs is track repeats. The workouts consist of about 5000 yards of speed and rest intervals (plus a warm-up and cool-down). The speed intervals are no more than 10 minutes long and are at about a 5-K pace. (The Run Less Run Faster book contains tables to allow each runner to determine the appropriate paces for the intervals.) The rest intervals (walking or jogging) are usually between 1 and 2 minutes long.

The purpose of the track repeats is to improve max VO2 running speed and running economy. The maximum VO2 is a measure of the runner’s ability to produce energy aerobically. A runner with a higher VO2 max can run faster than a runner with a lower VO2 max. The speed intervals contribute to the “run faster” part of Run Less, Run Faster.


Track repeat workout for Tuesday, March 13th

I run the repeats on a treadmill, instead of an actual track. (Most schools don’t take kindly to strange adults on the track during school hours.) Before the workouts, using the charts in the book, I look up the designated time for each interval distance (400, 600, 800, 1000, 1200 or 1600 meters). I convert those times into both minutes-per-mile and miles-per-hour, so that I can set the treadmill to the appropriate speed for my intervals.

Based on my half marathon time from the 2011 Heart Mini Marathon, 2:04:16, RLRF predicts that I would run a 5K in 26:50 and that I should use the track repeat times associated with a 26:50 5K. I tried running the intervals at the suggested paces and nearly killed myself. Instead, I’m using the paces associated with a 28:00 5K (2:09:47 half and 4:32:28 full marathon):

400 meters in 2:05 = 8:22/mile = 7.2 mph
600 meters in 3:10 = 8:30/mile = 7.1 mph
800 meters in 4:14 = 8:31/mile = 7.0 mph
1000 meters in 5:20 = 8:35/mile = 7.0 mph
1200 meters in 6:28 = 8:40/mile = 6.9 mph
1600 meters in 8:45 = 8:48/mile = 6.8 mph

Using miles-per-hour on the treadmill isn’t perfect. The machine is only adjustable to one decimal point, so an 8:31 mile and an 8:35 mile are both done on the 7.0 mile-per-hour setting. However, it’s also difficult to hit exactly the right pace on a track, so I think the treadmill mph settings are close enough!

I always complete the 10 – 20 minute warm-up and the 10 minute cool-down, but I have yet to finish the main (5K) set as specified. Even using slower intervals than recommended, I tire quickly. I often slow the belt down or complete fewer intervals (or both). Still, I’m getting a good workout. My heart rate easily reaches the performance zone (91% of max) during the speed intervals. During the rest intervals, if I feel like I need more recovery, I walk until my heart just drops out of the aerobic zone and then start the next speed lap. I keep telling myself “just one more speed interval,” until I simply cannot complete any more and then I begin the cool-down. I aim to complete a total of at least 5 miles (including warm-up and cool-down).

Normally, the treadmill bores me, but I’m never bored running intervals. There is always something to look forward to (or dread) in the next segment. I feel like a total badass when I go from walking to a fast run, rapidly punching at the “increase speed” button. After my speed laps, I’m incredibly relieved to decrease the speed for my rest intervals. I’m usually 45 minutes into my workout before I realize how long it’s been.

I found this the most challenging, but the most rewarding, of the three key runs. I’m not a sprinter; I’m more of a “slow and steady” runner. The track repeats are very difficult to complete, but leave me feeling kind of awesome.

Sporty Sunday is a recurring feature in which I share my fitness routine and offer and solicit advice. While this content might seem a little out of place in an outfit diary, a healthy, strong body is the foundation of my wardrobe. I hope to inspire my readers to be fit as well as stylish!

9 comments:

C Lo said...

Very timely. I'm a relatively new runner and I'm gearing up to start training for a half marathon, but I really need to improve my speed. Good info. :)

R said...

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http://www.nytimes.com/slideshow/2012/04/09/fashion/streetstylespringscarves-23.html

Jenna said...

I might have to try that out as I've got a run route that would just about cover the required distance including warm up and cool down. The pace for each set is just a fraction quicker than I run normally so it would be a nice challenge.

littlenashua said...

Two sets of 6x400 is a LONG workout - no wonder you struggle to finish them. I was an NCAA cross country runner and coach in a former life, and I never completed anything that long. I realize the workout is based on the "run less" aspect, the theory being if you only run 3x per week, you have to make each one count. That being said, I ran my fastest when I was running at most 25 miles per week (a decade after graduating from college) and did much shorter workouts (mostly ladders of 200-400-600-800-600-400-200, one set, be done with it). I don't think I could ever complete the longer workout that you wrote about at 5k pace. I would consider doing one set, but never two.

Kasmira said...

Awesome! Thanks for letting me know!

Kasmira said...

I've never done speed work before, so I really appreciate your perspective. Now I don't feel so bad about tiring quickly!

The Small Fabric Of My Life said...

I am training for a marathon in October and your times are very similar to mine so this post has been very useful.
I always do my speedwork on a tradmill as everytime I do it outdoors I always seem to pull a quadricep muscle.

Frankie said...

Great blog! Indeed VO2 max is considered the best indicator of cardiovascular fitness and aerobic endurance. The test measures the difference between the oxygen that you breath in and the level of oxygen in your exhalation some is converted to carbon dioxide and water. This makes this tool a must have for any health conscious enthusiast.

PeterP said...

That is quit challenging schedule you got yourself. But then again " no pain no gain"
Good luck to you.