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Chapter 11
Angular Kinematics of Human Movement
Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D.
McGrawHill/Irwin © 2012 The McGrawHill Companies, Inc. All rights reserved.
Measuring Angles
What is a relative angle?
• angle at a joint formed between the longitudinal axes of adjacent body segments
• AKA joint angle
• the straight, fully extended position at a joint is regarded as zero degrees
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 11-2
Measuring Angles
The relative angle at the lead knee tends to be smaller during sprinting than during distance running.
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 11-3
Measuring Angles
What is an absolute angle?
• angular orientation of a body segment with respect to a fixed line of reference
• (reference lines are usually vertical or horizontal)
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 11-4
Measuring Angles
The absolute angle of the trunk with respect to vertical is often a quantity of interest in studies of lifting as related to low back
pain.
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 11-5
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