Example the soleus which is more concerned with

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Example: the soleus, which is more concerned with postural stabilization of the ankle joint, generally contains approximately 67% red fibers and 33% white fibers, whereas the gastrocnemius, which is more concerned with creating movement at the ankle joint, generally contains approximately 50% red fibers and 50% white fibers. Characteristics of skeletal muscle fiber types Slow twitch Fast twitch Other name Fiber diameter Metabolism Fatigue resistance Location where fibers are most abundant Function
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71 EXCI 206 2017
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72 EXCI 206 2017
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73 EXCI 206 2017
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74 EXCI 206 2017 Describe the difference between red slow-twitch and white fast-twitch fibers. _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ Fill in the table (high or low) Event Slow-twitch – type I Fast-twitch – type II 100m sprint 800m run Marathon Olympic weightlifting Barbell squat Soccer Field hockey Football wide receiver Football lineman Basketball Distance cycling
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75 EXCI 206 2017 Effects of aging on skeletal muscle y Reduced muscle mass (size and power) y Loss of muscle fibers y Increased time for muscle to contract in response to nervous stimuli y Less elastic (less flexible) y Reduced tolerance to exci y Increased recovery time
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76 EXCI 206 2017 Review Questions 1 What are the 3 types of muscle contractions? 2 What is the name given to a muscle that concentrically contracts? 3 What is the name given to the force that a concentrically contracting muscle must work against? 4 What type of contraction occurs when a muscle contracts and shortens? 5 What type of contraction occurs when a muscle contracts and lengthens? 6 What type of contraction occurs when a muscle contracts and stays the same length? 7 What type of muscle contraction is necessary for a person to flex the arm at the shoulder joint from anatomic position? 8 What type of muscle contraction is necessary for a person to slowly adduct the arm from a position of 90 degrees of abduction (at the shoulder joint) to anatomic position? 9 What type of muscle contraction is necessary for a person in anatomic position to rotate the neck to the right at the spinal joints? 10 What type of muscle contraction is necessary for a person (otherwise in anatomic position) to hold the left thigh in 30 degrees of abduction at the hip joint? 11 What is the most common scenario in which a muscle eccentrically contracts? 12 Why might a person contract mover muscles for a joint action that brings a body part downward? 13 What is the definition of a mover? 14 Do mover muscles always contract when a joint action occurs? 15 What is the definition of an antagonist? 16 Do antagonist muscles always contract when a joint action occurs? 17 What is the definition of a fixator? 18 What is the definition of a neutralizer?
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