HARP

Slow walking people (leaving the movies hemmed in) side sway as they sludge forward. Oops ‘excuse me.. oops again, didn’t mean to bump your popcorn… PELVIC ELEVATION So, now we can MENTALLY envision

M Center of pelvis rises over each leg’s stance peak (& HARP – hip ankle relative position) goes vertical. KNEE ANGLE They call this the “knee angle” graph (They lie !!) PRESSURE The floor force plate feels the downward pressure of what is going on above. As pelvic center is

lifted, Isaac Newton would have this be pressed downward. It doesn’t actually budge, (built for horse’s kicks) but the force resisting (called ‘ground reaction’), pressure rises, nearly matching the top pelvic-elevation graph in appearance. These graphs were taken from a mix of volunteer walks testing weird things in their shoes (lifts & cushions) to get a sense of what they do. Most of the asymmetry (R vs L) is because different things are in or not in opposite shoes. Reason: help us to visualize the scope of what donned devices can do. Does unilateral anything matter? Room for simplification. Right?