biomechanics of skeletal muscle (ch 6) objectives n identify the basic behavioral properties of the...
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Biomechanics of Skeletal Muscle(Ch 6) Objectives
Identify the basic behavioral properties of the musculotendinous unit.
Explain the relationships of fiber types and fiber architecture to muscle function.
Explain how skeletal muscles function to produce coordinated movement of the human body.
Discuss the effects of angle of pull, force-velocity and length-tension relationships
Discuss the concepts of strength, power, and endurance from a biomechanical perspective.
Properties, structure and function of muscle
Properties of muscle-tendon function- Extensibility and elasticity
• Elastic and contractile components (Fig 6.2, p 147)
- Irritability and the ability to develop tension
Structural Org of Skeletal Muscle (Fig 6.3 – 6.6) Motor Unit (Fig 6.7, p 151) Classification of Muscles
- by fiber architecture: parallel, pennate (F 6.11, p 155) - by articulation (number of joints crossed)
• uniarticulate, biarticulate • passive and active insufficiency
Active Insufficiency – due to inability of a
multiarticular muscle to generate force when shortened at one end : (also, see Fig 6.15, p 161) :
Electromyography and fiber type recruitment
The motor unit and Electromyography (Figure from lab)- motoneuron & all innervated fibers
Muscle Fiber Types - Slow twitch oxidative (SO), or Type I- Fast twitch oxidative glycolitic (FOG), or Type IIA - Fast twitch glycolitic (FG), or IIB - Functional differences -Fig 6.10, p 152- Characteristics - Table 6.2, p 153- Selective recruitment of fiber types – size principle:
• SO FOG FG
Factors Influencing Production of Muscular Tension and Applied
Force
Force-velocity relationship - Fig 6.17, p 162 Length - tension relationship - Fig 6.18, p 164
- Elastic and contractile components Angle of pull - Max turning effect at 90 deg
Study Questions For Chapter 6 Biomechanics of Skeletal Muscle
What do these terms mean:- Strength- Endurance- Power
Introductory problems, p 172- 3,8,9
Additional problems, p 173-4- 1,2,8,9 (My sketch of problem #2 is on next slide)