According to Herman Pontzer, Ph.D (Journal of Experimental Biology), fossil records show that 2 million yrs. ago, human leg length suddenly began to increase…presumably to conserve energy during long distance travel. Pontzer’s model predicts the rate of energy use related to limb length, i.e., longer legs = less force production = lower energy cost.
To test his theory, Pontzer placed people, dogs and goats on a treadmill and measured the amount of oxygen each used during running & walking at various speeds. “All things being equal, leg length is one of the major determinants of energy cost,” says Pontzer, “If two animals are identical except for leg length, the animal with longer legs is more efficient.”
Although his findings seem reasonable, my question is: “In humans, are legs really the propelling force or do we possess a more complex “whole-body” antigravty “spring system” that determines gait efficiency. See http://erikdalton.com/articleDontGetMarried_Part2.htm or some of Tom Myer’s articles at AnatomyTrains.com.
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Shoulder pain, tennis elbow, carpal tunnel, nerve entrapments—upper extremity complaints can be some of the most frustrating conditions therapists encounter. In the Shoulder, Arm & Hand Course, Erik Dalton teaches 65 practical techniques designed to restore motion, reduce pain, and address the underlying strain and compensation patterns driving dysfunction. You’ll learn innovative deep tissue, nerve mobilization, joint stretching, and graded exposure techniques that can be immediately incorporated into your practice. Help clients avoid surgery, reduce reliance on pain medication, and become the therapist they trust for lasting results. (16 CE)
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