Chapter03-1

Chapter03-1 - Chapter 3 Muscular Considerations for...

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Unformatted text preview: Chapter 3 Muscular Considerations for Movement Objectives After reading this chapter, the student will be able to: Define the properties, functions, and roles of skeletal muscle. Describe the gross and microscopic anatomical structure of muscles. Explain the differences in muscle fiber arrangement, muscle volume, and cross-section as it relates to the output of the muscle. Describe the difference in the force output between the three muscle fiber types (types I, IIa, IIb). Describe the characteristics of the muscle attachment to the bone and explain the viscoelastic response of the tendon. Discuss how force is generated in muscle. Describe how force is transmitted to bone. Discuss the role of muscle in terms of movement production or stability. Compare isometric, concentric, and eccentric muscle actions. Describe specific considerations for the two joint muscles. Discuss the interaction between force and velocity in the muscle. Describe factors that influence force and velocity development in the muscle, including muscle cross-section and length, the length-tension relationship, neural activation, fiber type, the presence of a prestretch, and aging. Explain the physical changes that occur in muscles as a result of strength training and elaborate on how training specificity, intensity, and training volume influence strength training outcomes. Describe types of resistance training and explain how training should be adjusted for athletes and nonathletes. Identify some of the major contributors to muscle injury, the location of common injuries, and means for prevention of injury to muscles. FIGURE 3-1 Skeletal muscles of the human body: anterior and posterior views. Muscle Tissue Properties Irritability Ability to respond to stimulation Contractility Ability to shorten when it receives sufficient stimulation Unique to muscle tissue Extensibility Ability to stretch/lengthen beyond resting length Protective mechanism Elasticity Ability to return to resting length after being stretched Protective mechanism Functions of Muscle Produce movement Maintain postures and positions Stabilize joints Other functions Support and protect visceral organs Alter and control cavity pressure Maintain body temperature Control entrances/exits to the body Skeletal Muscle Structure Physical Organization of Muscle Groups of Muscles Muscles typically act in unison, not individually Fascia Sheet of fibrous tissue Compartmentalizes groups of muscles FIGURE 3-2 Muscles are grouped into compartments in each segment. Each compartment is maintained by fascial sheaths. The muscles in each compartment compartment is maintained by fascial sheaths....
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Chapter03-1 - Chapter 3 Muscular Considerations for...

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