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PCA Demonstrates Trunk Muscle Pattern Variation with Fall Direction
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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.
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