Course 122...Intro Biomechanical Physics of the Musculo-Skeletal Lever System

In this section you will have the opportunity to test yourself
on the course material you have studied, or
move to the next step and take the Final.

* To receive course credit a passing grade of 70% is required.

        To review course material: see Course 122

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Once you have satisfactorily completed these tests and wish to receive Credit for this course,
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2)

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3) Click HERE to take the Final
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Below is a trial test, which you may take for practice only.

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True | False

1.	A weakness in the adult S-shaped posture’s ability to sustain stability against the force of gravity is it needs to use complex mechanisms of shear stabilization
2.	1st and 3rd class levers can both create shear forces at the joint.
3.	In human movement the force of resistance and force of effort (muscle) combine to create the resultant force or true resistance arm.
4.	The S-shaped posture gives the human spine the unique ability to utilize 1st class levers when functioning against a resistance from the anterior in either the supine or upright position.
5.	The basis of determining if a lever system in human movement is either 1st or 3rd class is determined by analyzing how the resultant force (TRA) is functioning against the stabilizing force (TEA) at their fulcrum point.
6.	Shear forces characterize stability and compressive forces characterize instability in lever systems.
7.	If a human movement requires 3rd class lever systems, you would typically examine human anatomy for the mechanisms of shear stabilization.
8.	Typically lever systems in the human body are best identified by looking for anatomical attachment of the muscle of effort relative to the fulcrum point and the resistance and not by mathematical discovery.
9.	Human locomotion suffers when the proper spinal posture is lost due to the fact the body typically becomes a postural maintenance machine rather than one designed for movement.
10.	A better way to determine joint strength would be to look at the joint tissue’s ability to handle compression and shear forces rather than just looking at the initial force of effort.
11.	In a runner that is slow and has tight hamstrings, it would be logical to suspect that their shortened stride length was due to the fact that their legs are being used by the body to stabilize upright posture rather than being devoted to locomotion.
12.	In an athlete that was stiff and weak when it comes to contact sports like football, we would logically suspect that they have poor spinal posture that was requiring the use of 3rd class lever systems.
13.	Since it appears that all humans are supposed to develop the upright S-shaped posture that gives humans unique physical abilities naturally, it is something training and treatment programs should not have to be concerned with.
14.	If an athlete in a sport that requires jumping chronically demonstrates poor technique like jumping into the net, it would be logical to check the athlete for poor spinal posture.
15.	If an athlete demonstrates knee problems like anterior cruciate ligament strain, it would be logical to advise the athlete to avoid training exercises that create shear forces that the injured ligament must stabilize.
16.	It is logical that any competent training program, especially in youth sports when the spinal posture is developing, needs to implement ways for the enhancement, restoration and preservation of the proper upright adult S-shape posture.

Last Modified : 01/04/11 All concepts and diagrams, unless noted otherwise,
of human spinal development in gravitational environment are under copyright registration
to John S. Scherger, D.C.. This information may be shared with others for personal use,
however no document may be republished in any form or embedded
in public databases without the permission of Dr. Scherger.