PED 1323 Motor Control & Motor Learning

Extensors and inhibit flexors of leg to help hold you

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extensors and inhibit flexors of leg to help hold you up (3,6,7), contributing up to 50% of the ankle extensor force (5) A system of positive force feedback across joints is enabled during locomotion (2) WHILE STANDING: When an extensor muscle contracts, Ib afferents from GTOs in contracting muscle excite homonymous and other (heteronymous) leg extensors (4,7) reinforcing force feedback is not a constant feature but is task dependent. It appears only in situation where it is appropriate, such as gait. In other conditions such as in the immobile resting animal, such pathways are closed…“(1) 1. Duysens et al. Load Regulating Mechanisms in Gait and Posture, Physiological Reviews, 2000
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Motor Control Section 3: Motor control aspects of resistance training Unit 7: Additional exercise science applications of spinal reflexes 2. Nichols et al., Rapid Spinal Mechanisms of Motor Control, Exercise & Sport Sci. Reviews, 1999. 3. Pearson et al, Exp Brain Res, 90:557, 1992 4. Pratt, J Neurophysiol, 1995 73: 2578 5. Donelan JM, Pearson KG. Contribution of force feedback to ankle extensor activity in decerebrate walking cats. J Neurophysiol. 2004 Oct;92(4):2093-104. 6. Grey MJ, Nielsen JB, Mazzaro N, Sinkjaer T. Positive force feedback in human walking. J Physiol. 2007 May 15;581(Pt 1):99-105. 7. Windhorst U. Muscle proprioceptive feedback and spinal networks. Brain Res Bull. 2007, 73(4-6):155-202 8. Richard af Klint, et al., Load rather than length sensitive feedback contribute to soleus muscle activity during human treadmill walking. J Neurophysiol. 17 March 2010, 10.1152/jn.00547.2009 9. af Klint R, Cronin NJ, Ishikawa M, Sinkjaer T, Grey MJ. Afferent contribution to locomotor muscle activity during unconstrained overground human walking: an analysis of triceps surae muscle fascicles. J Neurophysiol. 2010 Mar;103(3):1262-74. Epub 2009 Dec 23 See also: Do Golgi Tendon Organs Really Inhibit Muscle Activity at High Force Levels to Save Muscles From Injury, and Adapt with Strength Training? By: G. Chalmers, Sport Biomechanics, 1:239-249, 2002 Bottom line: Research evidence indicates when a GTO Ib fires due to muscle tension: May act on other muscles - not just on homonymous muscle May excite, or inhibit, the target muscles, depending on the motor task This proprioceptive reflex facilitates movement (it is not “protective”) Do GTOs adapt with strength training to allow you to produce higher forces? b) The concept that GTO inhibit tension production is flawed (see: above) c) There is no evidence that GTO reflex function adapts with resistance training. (See: Do Golgi Tendon Organs Really Inhibit Muscle Activity at High Force Levels to Save Muscles From Injury, and Adapt with Strength Training? By: G. Chalmers, Sport Biomechanics, 1:239-249, 2002)
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KIN 410 Study Guide For all content, understand the course material at the depth and the breadth of the material as it was covered in lecture, and in the lecture notes, using the correct terminology. Practice the application of this knowledge to work in our field, as we do in lecture, using discussion questions within, and at the end of units. Additional
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  • Fall '11
  • John Smith
  • The Land, Motor control, Gordon Chalmers

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