Finding The Sweet Spot

"These sudden joys have sudden endings. They burn up in victory like fire and gunpowder. . . . Too fast is as bad as too slow."
--"Romeo and Juliet," Act 2, Scene 6 (William Shakespeare, ca. 1597), in modern English.

My loving wife often warns me about what she calls "hobby-horses." She knows I tend to be fixated to the verge of obsession on certain topics. When I served as RRCA state rep for North Florida, headphone use was my "hobby horse." I've had other "hobby horses," too, but the headphone thing was most-notable.

I've talked a lot about treadmill running with people who hate treadmills. Some of them are folks who say TMs are no good for training, others don't like the boredom factor. Since late November, I've done every weekday run, including speed workouts, on a treadmill. True, the TM can be breathtakingly boring, but they let me control many training variables. I can adjust one variable at a time and see how my body reacts, or I can end the workout the instant my tendons are in distress.

The initial 35-minute runs are now 60-minute runs, averaging eight minutes per mile. The good news is I'm near the training volume where I was when I was running six days a week and racing once every three months. But the ache in my back and hips is not so good.

It's not the shoes - the oldest of my three pairs has somewhere between 260-270 miles on them, with the newest pair less than thirty. Could it be the treadmill? The "Gait Guys" wrote an article for Triathlete magazine; they warned readers about how a treadmill can adversely affect a runners' gait.

After reading the research by University of Virginia physical therapist Jeff Dicharry, I called the overwhelming majority of the "Gait Guys" article bupkis. Except for that "downhill" thing.

Like a road or trail surface, the feel and comfort of a treadmill varies by manufacturer, model, and even the machine's installation. Ed W. sees treadmills and elliptical trainers as warm-up, not the workout itself...that means run/tri guys like me are not his gym's typical customers. The treadmills in his cardio area are on solid rubber flooring, and thick rubber matting supports his lobby area TMs. There might be a slight slope in the lobby naturally; all the lobby treadmills seem to have this feeling like one is running slightly downhill.

The "Gait Guys" say the downhill sensation is caused by the "pull" of the belt on the runner's lower extremity, in contrast to the "push" of the lower extremity on the ground surface. They say it affects the gait; Dicharry has proven whatever variations exist (in 40 percent of runners) are so miniscule that to tell the difference it requires equipment which exists in only two sports labs in the country.

So, runners who sense that "downhill" feeling on the TM may benefit from an elevation tweak of 0.5-to-1.0 percent. I've tried both; for me a 0.5-percent adjustment is enough to take away that sensation.

The cause of the hip ache is simple - spin class on the "off" days. The exercise bicycle in the gym cannot be adjusted as readily as a "real" bike, or like a "spinning" bike. Different movement patterns cause musculoskeletal aches and soreness.

Any runner who has ever tried to run a pace that is too slow for their comfort has probably found out too late the error of their ways. I like to tell the tale of running with Suzanne at Honolulu's Ala Moana Park in January 2008; a solid minute-to-two-minutes-per-mile decrease in pace left me hobbling after the third day. A pace that is much slower than a runner's intrinsic efficiency forces major gait adjustment, either in stride length or stride duration. A shorter stride length is not biomechanically injurious; a longer stride duration means a longer period of compression time for the large muscle groups and joints. Drive with your shock absorbers compressed beyond their normal range for an extended period of time is most likely going to shorten their lifespan.

So, perhaps it's possible not only for a runner to go at a pace that is too fast - leading to fatigue, overstriding, a compensated gait pattern, and heel-striking - but also too slow on a treadmill.

How can a runner determine what are good training paces for treadmill runs, without going into a lot of trial and error? There are a couple of really good on-line calculators developed by some of the nations' best running coaches (e.g., McMillan, Daniels) which provide optimal pace ranges for easy runs, recovery jogs, and speed work of varying degrees.

I used my Daniels VDOT training pace for easy/long runs as the starting point for treadmill runs. After a time it appears the easy/long run pace is too slow. So, I will probably start at the "marathon pace," a little closer to 7:30/mile, and adjust downward until I find the least uncomfortable pace which doesn't feel too slow.

That's why the later editions of Running Formula, and McMillan's calculator, have pace ranges, because there will always be a sweet spot at each of the intensities which feel best for the individual runner. While running too fast on the treadmill can injure a runner, too fast is no more injurious than running too slow.

To Bear The Brunt Of The Barefoot Run...

...we're talking something akin to Shakespeare's sound & fury here, folks.

Everywhere I turn, during every run I take with other runners, someone talks about either the barefoot running or the minimalist shoe mania. I'm certain using the term mania is accurate, because the proponents, even the ones who have minimal knowledge of biomechanics or sports performance, are all in a barely-controlled lather. Naturally, when a National Public Radio news program comes out with the results of a research article published in the journal Nature, that's when you know the manic have turned mainstream.

Daniel E. Lieberman, an evolutionary biologist, & others looked at the foot strike patterns of runners who wore shoes, & compared them to the patterns of runners who did not. Since our ancestors didn't have K-Swiss K-Onas, or Nike Frees, or Newtons, or even Asics Speedstars, it's safe to presume they were better built to deal with traveling the world (whether at high or low speed) barefoot. Here's the abstract from Nature:

'Humans have engaged in endurance running for millions of years, but the modern running shoe was not invented until the 1970s. For most of human evolutionary history, runners were either barefoot or wore minimal footwear such as sandals or moccasins with smaller heels & little cushioning relative to modern running shoes. We wondered how runners coped with the impact caused by the foot colliding with the ground before the invention of the modern shoe. Here we show that habitually barefoot endurance runners often land on the forefoot (forefoot strike) before bringing down the heel, but they sometimes land with a flat foot (midfoot strike) or, less often, on the heel (rearfoot strike). In contrast, habitually shod runners mostly rear-foot strike, facilitated by the elevated & cushioned heel of the modern running shoe. Kinematic & kinetic analyses show that even on hard surfaces, barefoot runners who forefoot strike generate smaller collision forces than shod rearfoot strikers. This difference results primarily from a more plantarflexed foot at landing & more ankle compliance during impact, decreasing the effective mass of the body that collides with the ground. Forefoot & midfoot strike gaits were probably more common when humans ran barefoot or in minimal shoes, & may protect the feet & lower limbs from some of the impact-related injuries now experienced by a high percentage of runners.'

You've heard of driveway moments if you've listened to NPR long enough. Those are the moments when a report is so good you sit in the driveway & don't get out of the car until the report is done. Well, I nearly had a Tourette's Syndrome moment; I was still several miles from the house & grateful my windows were rolled up so nobody could hear me curse.

First - if your study is funded by a company which makes minimalist shoes (Vibram, to be exact!) you're not going to bite the hand that feeds you (or, your lab assistants; Lieberman says he received no personal income from the company). We also know the dictum of research universities: publish or perish. If someone's going to pay for research I can publish, so much the better.

Second - while Lieberman states he is a marathoner, the NPR interviewer does not tell us whether he is a three-hour guy or a five-hour guy. Yes, there is a difference between the running style of faster runners & the less fast ones. A person who is walking will naturally strike first near the heel & then roll forward onto the ball of the foot. Slower runners & joggers also tend to do the same, as a natural extension of the walking gait. As the speed of the run increases, the runner tends to do either one of two things:

They pound the heels into the ground because they're overstriding (a result of experience in sprint-focused sports such as football, basketball and baseball), which causes shock-related stress & the injuries which result, or...

They adapt; shortening the stride & strike closer to the midfoot or the forefoot.

Third - the report was not an injury study, & Lieberman has no hard science to support his theory. Besides, my shoeless ancestors weren't running on Gonzales Street in the East Pensacola Heights, which is a slab of concrete. It is more likely they were running & walking on grass or dirt trails, which meant they had a better surface in the first place on which to run.

So, before you go throwing those running shoes into the rubbish, follow the money behind the research. Take a closer look at your stride mechanics. You can't, & probably shouldn't change, but a small part of your running mechanics. There are little tweaks you can do, but beyond a certain point there is the risk of serious injuries which can make you Once A Runner. If you decide to try a minimalist shoe work into them gradually (once again, the ten percent rule of thumb!) to see whether your muscles, tendons, ligaments & bones can handle the change.