Bookcover of PCA Demonstrates Trunk Muscle Pattern Variation with Fall Direction
Booktitle:

PCA Demonstrates Trunk Muscle Pattern Variation with Fall Direction

Application of Principal Component Analysis to a Biomechanical System

VDM Verlag Dr. Müller (2009-04-24 )

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ISBN-13:

978-3-639-13542-8

ISBN-10:
3639135423
EAN:
9783639135428
Book language:
English
Blurb/Shorttext:
This study examines the role of the direction of a fall on neuromuscular response. Electromyography sensors were positioned on the erector spinae of twenty subjects. Falls, simulating slips, occurred in the anterior, posterior, and medial-lateral directions. The average activation curves for the four different fall directions displayed different characteristics. Observations were supported by principal component analysis (PCA). PCA coefficients related all fall directions to a single reflex-like response. Analysis of variance on the coefficients demonstrated that anterior falls had a significantly (p0.05) stronger reflex-like response than posterior falls. There was also a significant (p0.05) difference for the interaction between side of the erector spinae and fall direction for the medial-lateral fall directions. Here the contra-lateral muscle had a stronger reflex-like response than the ipsi-lateral muscle. Possible reasons for the observations could be to increase time available for active responses or decrease the energy transferred if the head impacted the ground.
Publishing house:
VDM Verlag Dr. Müller
Website:
http://www.vdm-verlag.de
By (author) :
Timothy Craig
Number of pages:
84
Published at:
2009-04-24
Stock:
Available
Category:
Technology
Price:
49.00 €
Keywords:
PCA, Falls, Electromyography, biomachanics

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