OldSub4 wrote:
Track runners develop a left leg dominance -- on purpose. You are training for a race that is 50% running counterclockwise at a 45% angle. Pre had the same thing....eventually you develope such a powerful hip flexor on your left side from anchoring your turn running that your leg gets "hitched" up a bit and it looks like a leg length discrepancy--sometimes that it is case but most times not.
That's my opinion too. But the real concern is eventually it becomes chronic, and affects one's ability to run in a straight line. This will increase energy costs and perceived effort at a given pace compared to someone without such imbalances. Not forgetting the various injuries that will come from running with a short leg.
This is something I believe we cannot afford to ignore, or even take it as a given for trackers. It may mean having your improvement stalled at some premature point, or just that general feeling that running is no longer 'fun', because your body is no longer functioning fluidly due to the constant need to compensate for the imbalances. Even if you do not get hurt, you will find running at race pace much harder than usual, and conclude that you've become too 'old' for this.
I think it's telling that Haile Gebrselassie's career has extended successfully into his mid-thirties (and will probably be the case way beyond that), AFTER he has reduced track training and moved to marathon training. Remember how often he had achilles trouble whenhe was a 5K/10K specialist.
Shorter hip flexors on one side will mean the need for the longer leg to extend forward to catch up with the shorter leg, leading often to heel striking. The shorter leg will be landing almost on toes or forefoot most of the time and this too will lead to achilles/soleus problems, and even metatarsals breaks. Hip rotation will be impeded on the shorter side and this reduces forward movement.
Bernard Lagat may have had his fair share of physical problems, but his longevity in the sport thus far is a result of keeping the majority of his running work off track, even during the heart of track seasons.
I think this also illustrates the immense importance of the non-running aspects of training. I've read an article by Liam Cain on 800m training and he writes:
"A conditioned athlete will be able to absorb the many varied training sessions without breaking down through injury. Greater athleticism begins with POSTURE,BODY ALIGNMENT and MUSCLE BALANCE EVALUATION. The introduction of mobility in the ankle, hip and shoulder joints coupled with the development of skills and drills contribute to the athletic development of the 800m runner."
(From "How to Develop The 800m Specialist", para. 3, emphases mine)
I think that's why Coe spent so much time on stage, circuit, and weights training, also on drills and plyometrics. It's part of making sure his bodily dysfunctions do not catch up with all those hard running sessions.
The watch word for our era is perhaps "core" training. But this will count for naught, in my opinion, if we are running lopsided most of the time, because technical efficiency falls apart & so does your race. We need to find balance even in our track work.
Just look at Coe again on Rivelin Valley Road, esp when running on the staight sections. In order to get his feet to touch down evenly, his upper body has to compensate quite a bit. To me this can lead to more fatigue than usual.
http://www.youtube.com/watch?v=FdPy_3AXTQ4Can this be why he never broke world records again after 1981? (altho he did lower his 1500m PR in 1986....)