PCA Demonstrates Trunk Muscle Pattern Variation with Fall Direction » książka
PCA Demonstrates Trunk Muscle Pattern Variation with Fall Direction
ISBN-13: 9783639135428 / Angielski / Miękka / 2009 / 84 str.
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 (p
This study examines the role of the direction of afall on neuromuscular response. Electromyographysensors were positioned on the erector spinae oftwenty subjects. Falls, simulating slips, occurredin the anterior, posterior, and medial-lateraldirections. The average activation curves for thefour different fall directions displayed differentcharacteristics. Observations were supported byprincipal component analysis (PCA). PCA coefficientsrelated all fall directions to a single reflex-likeresponse. Analysis of variance on the coefficientsdemonstrated that anterior falls had a significantly(p<0.05) stronger reflex-like response than posteriorfalls. There was also a significant (p<0.05)difference for the interaction between side of theerector spinae and fall direction for themedial-lateral fall directions. Here thecontra-lateral muscle had a stronger reflex-likeresponse than the ipsi-lateral muscle. Possiblereasons for the observations could be to increasetime available for active responses or decrease theenergy transferred if the head impacted the ground.
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