Peter Weyand, PhD, SMU. Locomotor Performance Laboratory.

From our new friend Peter Weyand, PhD, SMU, Dallas. Southern Methodist University, Locomotor Performance Laboratory.
In the study:
The biological limits to running speed are imposed from the ground up.
J. Appl Physiol (Jan 21, 2010).
Study concluded that the stance phase limit to running speed is imposed, not by the maximum forces that the limbs can apply to the ground, but rather by the minimum time needed to apply the large, mass-specific forces necessary. So, the faster the foot applies the max force into the ground and gets that foot off the ground to do the same on the other foot, the faster the person will be able to run.

Harvard: Lieberman Studies on heel strike

Lieberman: …most experienced, habitually barefoot runners avoid heel landing & instead land forefoot or midfoot strike….most FF & some MF strikes (shod or barefoot) do not generate the sudden, large impact transients that occur with heel strike (shod or barefoot). Consequently, FF or MF strikers do not need shoes with elevated cushioned heels to cope with sudden, high transient forces that occur when you impact.

Saucony Kinvara

(repeat posting from January2011)
Saucony has jumped on the minimalist running bandwagon with the Saucony Progrid Kinvara, a 7.7oz training shoe that has a heel-toe offset of only 4mm (heel height=18mm, forefoot height=14mm thus heel:forefoot ratio is 1.2  !). The upshot: with it’s relatively flat sole, its well suited to promote a midfoot/forefoot footstrike. IF your foot type is appropriate for the shoe ! Key point !

The Gait Guys: YouTube video on Tight Calf, Posterior Compartment.
on same topic…. we see a huge number of patients with incompetent FHB (flexor hallucis Brevis and Extensor Brevis-EHB) muscles. Thus unable to complete the foot tripod and impairing ankle rocker as well……this is just the tip of iceberg. More to come on www.thegaitguys.com. See our YOUTUBE to make our EHB, FHB point.

“while no significant changes were found in all the gait variables in the sham group, the experimental group had significant increases in the gait speed, step length, as well as in several components of the joint angles and moments.”

Immediate effects of acupuncture on gait patterns in patients with knee osteoarthritis.