PPE CHAPTER 2 - Exercise Science: A Systems Approach...

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1 Copyright © 2011 American Col ege of Sports Medicine Exercise Science: A Systems Approach Chapter 2 Exercise Science: A Systems Approach • Systems of the body work respond to: – Physical activity Copyright © 2011 American Col ege of Sports Medicine – Regular exercise –S t r e s – Changes in nutritional intake – Extreme environmental conditions – Disease conditions Integration of Systems
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2 Systems of the body Copyright © 2011 American Col ege of Sports Medicine Copyright © 2011 American Col ege of Sports Medicine Nervous System Nervous System • Primary functions: – One of two primary control systems of the body Copyright © 2011 American Col ege of Sports Medicine • Primary component – neuron • Responds to acute challenges of the body • Important consideration in: – Disease conditions (e.g. cerebral palsy) – Sport performance (e.g. controlling movement)
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3 Nervous System • Organizational structure of the nervous system Copyright © 2011 American Col ege of Sports Medicine Neuron three regions e.g., -motoneuron Wilmore & Costill. Neural Control of Physical Activity. In: Training for Sport and Activity, 3 rd edition, 1988 Conduction velocity influenced by: • myelin sheath • neuron size Synapse Neurons communicate with each other across synapses Wilmore & Costill. Neural Control of Physical Activity. In: Training for Sport and Activity, 3 rd edition, 1988 A synapse involves: • Axon terminals of presynaptic neuron • Postsynaptic receptors on dendrite or cell body • The space between the two neurons
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4 Neuromuscular Junction Ach = acetylcholine Wilmore, Costill & Kenney. Neural Control of Exercising Muscle. In: Physiology of Sport and Exercise, 4th edition, 2008 Brain Central Nervous System
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PPE CHAPTER 2 - Exercise Science: A Systems Approach...

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