Running Biomechanics
With progressive peripheral vascular disease, plus the underlying non-compliant (rigid, non-elastic) abdominal aortic aneurysm (AAA) stent graft, which also limits blood flow to my legs, my last Marathon, in Maine was a foot pain nightmare. Should I give up Ironman? F**k that. As The Martian said, “It’s time to science the shit out of this.” I love that movie, even bought it! Science fiction is the science of the future.
OBSERVATIONS:
- Regular running induces severe claudication (pain and lockup) in my right calf.
- Claudication is followed by foot numbness. Eventually both feet go numb, unless I stop running. This is worse in cold weather, presumably due to blood being used to maintain core temperature – fortunately it’s warm in Kona.
- Running is helping the claudication, but not enough for an Ironman.
- IMPORTANT CLUE: There is no claudication or foot numbness on the bike or on an elliptical trainer. Why? NO IMPACT.
- Foot impact will create a pressure shock wave up my legs.
- Such an upstream pressure wave will counter the downstream (systolic and stored elastic aortic pressure feed) pressure wave, that drives blood into my feet.
- Furthermore, foot impact will create pressure and shear stress, which will tend to close peripheral arterioles and capillary beds, further reducing blood flow through my feet.
SOLUTION: Zero impact running.
IS THIS POSSIBLE, AT A SUFFiCIENT PACE FOR AN IRONMAN FINISH?
I’m working on it, with gradual success – 20 minutes at 20 minute pace on the treadmill right now, with zero claudication or foot numbness, but it’s much harder on the road.
OBSERVATION: This extreme shuffle running style is hard on feet and hip flexors, and requires extremely relaxed hips. No problem. Conditioning and learning, is all it needs.
NEVER GIVE UP!
Kev
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