Kinesiology Chapter 3

Kinesiology Chapter 3 - Chapter 3 The Musculoskeletal...

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Unformatted text preview: Chapter 3: The Musculoskeletal Chapter System Properties of Muscular Tissue 1.Extensibility 2.Elasticity 3.Contractility Muscle Fiber Muscle The muscle fiber made up of myofibrils Contain the contractile proteins: – actin and myosin Slow Twitch vs Fast Twitch Slow Small Twitch Small Red Rich blood supply Highly efficient Slow to fatigue Suitable for long endurance – Postural and endurance events – – – – – – Fast Twitch Large Pale Low blood supply Fast to fatigue Short periods of activity – Sprints – Weight lifting – – – – – Muscular Attachments: Muscular What is the nature of the bony landmark in which a tendon is attached? Types of Contraction: Types Concentric, eccentric, isometric, isotonic, isokinetic Which is safer for post­injury? Which builds muscle strength more so concentric vs eccentric? Type of Contraction Type What type of functional activity requires both type of contractions: concentric and eccentric? What is more difficult? Length-Tension Relationship: Length-Tension Maximum tension is achieved within a muscle when the muscle is slightly greater than its resting length Force-Velocity Relationship: Figure 3.8 3.8 Roles of Muscles: Roles (prime) movers: muscle that is directly responsible for producing a movement, synergists: muscles that work together to create a desired motion, stabilizers (figure 3.9): helps to stabilize a bone statically during the movement of possibly another bone; ie teres major and rhomboids neutralizers (figure 3.10): traps and rhomboids neutralize each other antagonists: opposite of prime mover; brake system Co-contraction: Co-contraction: Prime mover and antagonist work together… When does this happen? Why is this important? Action of Bi-articular Muscles: Action Examples of bi­articular muscles? Concurrent and countercurrent movements: figure 3.11 Concurrent: simultaneous extension or flexion of hip and knee: no loss of tension Countercurrent: mover shortens at both ends and antagonist lengthens at both ends Review of muscular anatomy Review ...
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