Saturday, December 3, 2005

instantaneous axis of rotation

An instantaneous axis of rotation is a place where we maintain a stable and central axis.

Expanding upon the concept of a core point two inches below the navel, there is a core line that extends from the inner arches of the feet all the way up the body, through the deep front muscles up the neck and ultimately into the center of head and then fountaining out the top.

Optimal posture, in standing, sitting, and movement, involves a flow through these core muscles so that there is no impingement of muscles creating pain in motion around a joint. This involves proper alignment of the body so that gravity doesn't compress the joints more than they are meant to be.

The definition of an instantaneous axis of rotation, according to [a website that no longer exists], is "the ability for any joint complex in the human body to function without internal derangement during normal human activities...Normal neuro-mechanical function allows pain-free motion about a joint."

Basically, we want freedom and full range of motion around each joint, and this involves keeping a sense of the core line and allowing the extremities to move freely, but integrated, around it.

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