jtupper wrote:
My wife and I counted rates of about 60 runners (from 800 to marathon, men and women) at the 84 Olympics and reported those results at a conference that next year. We counted the same runners in various races and timed them over known track distances so we could get both stride length and rate. Only one runner was under 180 (178). IN all my years teachng beginning running classes (some thousands of subjects) I always have them count stride rate the first day and have never had one as fast as 180. Seems interesting that novices turnover 160 or so and all the good ones go 180 or more. .
Jtupper,
While I certainly respect your knowledge, I don't think you are being too scientific here. You are comparing the stride rates of experienced runners in OLYMPIC RACES to beginners at a "running class.....on the first day" ?? That does not seem to be a fair comparison.
What if you had taken those beginners, gotten them in decent shape (without any focus on stride rate/length), and then put then in all out 5k? Don't you think their stride rates would have increased a bit? And what if you took those Olympic runners, and measured their stride rates while jogging? Don't you think their stride rates would have gone down a little bit? I do. (maybe the Olympic runners would still have had higher turnover, as you have shown that even in slower paces they keep a fairly high turnover, but the comparison might have been closer).
Points for all to consider:
1) I think many of these ideas about increasing stride rate are useful.
2) Why? Well 2 main reasons:
A) firstly, there are TWO ways to run faster: increase your stride rate or increase stride length. So yes, of couse increasing stride rate will help you go faster (up to a point), and
B) increasing stride rate is typically (for most) EASIER to do than increasing stride length and less costful energy-wise (as Tinman has pointed out). In Cycling, it has been proven beyond a doubt that making small changes (increases) in cadence is less costful energy-wise than small increases in power (what I mean: small increase in pushing a harder gear) at the same pace. Now pushing a heavier gear is not completely analogical to increasing stride length, but they are similar (they both involve using more fast-twitch/power fibers than quicker/easier strides/pedal pushes do).
Lastly, in some triathlon studies, when a comparison was done between run performance after a bike segment in which one etither spun faster vs pushed a heavier gear at the same heart rate, the group that spun faster (higher cycling cadence) did much better in the run portion, seeming to prove two things: the faster cadence was less energy costly, and there was a neuromuscular "carryover" or "memory" effect where the athletes continued at fast cadence on the run compared to the "heavier gear" group who was both slower and had smaller stride turnover on the run.
So...........yes, it is of course completely fundamental and natural for an increased stride rate to help performance, and it costs little energy to increase that rate, and it seems to become hard-wired in your nerves.
BUT.......what about stride length? It maybe be HARDER to improve, and more risky (potentially more injuries could occur), but it is JUST AS IMPORTANT if not more for improving performance.
jtupper: you compared the stride rates of Olympic racers vs your beginner students. Did you compare stride lengths???? I bet your $1,000,000 that the Olympic racers also had longer stride lengths. Why was THAT FACT not significant to you?
Also consider: studies have been done on top age-group runners, and the most consistently LARGE difference found between top young runners and top older runners was STRIDE LENGTH (stride frequency was lower in the older runners too, but not as significantly as the differenes in stride length). Clearly as you age, you lose power and flexibility, and thus stride length. So though it is harder to work on , wouldn't working on Stride Length be possibly even MORE important to becoming faster? I think so.
And....on page 13 of "Training Distance Runners" (Martin & Coe), a graph is listed, showing the "relationship between stride frequency and stride length." To quote:
" As running velocity increases, stride frequency increases, but STRIDE LENGTH INCREASES EVEN MORE, most likely from recruitment off additional skeletal fibers". In the graph, as pace increases from 8 min per mile towards 4 min per mile (and I assume this is averaged date from many top runners), frequency slowly rises. But LENGTH steeply climbs.
Now I know one could argue that aerobic/anerobic conditioning could be the prime reason why top runners can recruit more muscle fibers, and thus use a long stride length for a long period of time, thus arguing that CONDITIONING is the main obstacle to a long stride length, and I would agree in part, but not completely. I am sure that in ADDITION to improved cardiovascular condition, that flexibility training, power training (weights, hills, plyos), and PRACTICING a longer stride length could all contribute towards one eventually being able to use a longer stride length for longer periods of time, and thus go faster.
So in conclusion:
* Isn't it elementary to conclude that a faster stride rate AND/OR a longer stride length would improve one's ability to go faster? Yes
* While elementary, I DO agree that not enough people think about such basic facts of running, and think only about X distance in Y time, without considering the basics of what is effecting such a peformance, and how one to improve it.
* I do agree that stride frequency is easier and safer to work on, so maybe that should be the first part to work on for most
* BUT.....I think that ultimately stride frequency improvements can have an even bigger impact on performance, but tread carefully working on that because of injury risks or potential "over-striding risks" (it is true that way "over-striding" is more energy costly than way understriding)
So work on BOTH.