## Sunday, January 27, 2013

### The Biomechanical Model for Minimum Movement Time during Running Walking and Road Cycling 06: The Angular Impulse-Momentum Principle

The fifth fundamental Biomechanical principle included in this model is the Angular Impulse-Momentum Principle. This principle states that an increase in angular velocity of a body segment is caused by an increase in the joint torque (i.e., the turning effect caused by a muscle force), and/or an increase in the application time of the joint torque (i.e., the amount of time the joint torque is applied at the joint) and/or a decrease in the body component’s angular inertia (i.e., the resistance of the body component being moved to the angular motion).

The equation for the Angular Impulse – Momentum Principle is given here

Here is a graphical representation of the Angular Impulse – Momentum Principle.

Click on "read more" to view my description of the application of the Angular Impulse-Momentum Principle to real-world running.

## Wednesday, January 16, 2013

### The Biomechanical Model for Minimum Movement Time during Running Walking and Road Cycling 05: The Linear Speed - Angular Velocity Principle

The fourth fundamental Biomechanical principle included in this model is the Linear Speed - Angular Velocity Principle. This principle explains how we create joint linear speed. This principle states that an increase in joint linear speed (s) (i.e., the straight line speed) of a point on a rotating body segment is caused by an increase in the body segment’s angular velocity (ω) (i.e., the rotational speed of the body segment) and/or an increase the radius of rotation (rrot) (i.e., the linear distance from the axis of rotation to the point of interest on the rotating body segment). For most human movement, the radius of rotation is the distance from one joint to the next joint connected by a body segment (e.g., the radius of rotation for the upper leg segment would be the distance from the knee joint to the hip joint).

Click on "read more" to view my description of the application of the Linear Speed - Angular Velocity Principle to real-world running.

## Tuesday, January 15, 2013

### I'm back!!

I finished Fall Semester and I began working on my book.  I just finished the first draft.  My teaching experiences during Fall Semester and the writing of the book led to some updates for my Biomechanical Models.  Click on the links below to see the updated Biomechanical Model for Running, Walking & Road Cycling.  In my next post, I will continue the explanation of the Biomechanical Principles used to construct this model.

Biomechanical Model for Running and Walking

Top of the Model

Speed Up Side

Slow Down Side