Step Frequency, Clinical estimate of leg stiffness left/right differences

i think i've done my back!

 

Much better...just told i will be a grandfather again! YES!

 

Congrates to you and Your old lady ( Terri ? ) and your kid and kids other half

Love to speak a little OZ now and then

 

Re: Barefoot Running Debate

Hello Simon, sorry for asking a question now. How did you get 40 in your equation?

thanks for your time

 

Re: Barefoot Running Debate

40 is approximately 2x pi squared.

 

Re: Barefoot Running Debate

Thanks a lot Simon. Another dumb question. Whats is the rationale for using 2 x pi square in the equation.

thank you

 

Re: Barefoot Running Debate

Because it's based on the phase space rotation of a harmonic oscillator- a mass bouncing up and down on a spring.

 

Re: Barefoot Running Debate

See here:https://en.wikipedia.org/wiki/Simple_harmonic_motion

 

Re: Barefoot Running Debate

Thank you simon.
so this equation for leg stiffness is only applicable for running/ jumping and not for walking, since running is described as 'spring ball'. Am I right to say this?

I am yet to get my head around the leg stiffness concept so please bear with me.

thanks heaps

 

Re: Barefoot Running Debate

Traditionally, walking has been modellled as an inverted pendulum while a spring-mass model has been applied to running and hopping. However, while the inverted pendulum model predicts the energetics of walking, it does not predict the ground reaction force patterns observed in-vivo. For this reason, Hartmut Geyer has presented a bipedal spring-mass model for human walking which does appear to provide a more accurate model of human walking than the inverted pendulum. https://www.cs.cmu.edu/~hgeyer/Publications/GeyerEA06ProcRSocB.pdf