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CSU / Health Sport And Exercise Science / HES 207 / What type of muscle contraction occurs when the muscle contracts and s

What type of muscle contraction occurs when the muscle contracts and s

What type of muscle contraction occurs when the muscle contracts and s

Description

School: Colorado State University
Department: Health Sport And Exercise Science
Course: Anatomical Kinesiology
Professor: Ph.d.) jennifer c richards
Term: Fall 2016
Tags: Force, muscle, fibers, and contractions
Cost: 25
Name: Anatomical Kinesiology week 3 notes
Description: These notes cover more fibers, muscle contractions, and some force
Uploaded: 09/08/2016
2 Pages 173 Views 1 Unlocks
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Anatomical Kinesiology: HES 207


What type of muscle contraction occurs when the muscle contracts and shortens?



The Musculature:  

∙ Fibers Continued:  

 Fiber Architecture  

o Strap

o Fusiform

o Triangular

o Pennate

∙ Fiber Arrangements  

 LOA = Line of Action (pull)

o Goes in same direction as fiber  

o Needs to offset from joint center


What happens during an eccentric muscle contraction?



o Creates a moment arm  We also discuss several other topics like How have humans evolved as part of the natural world, how have environmental changes affected human development?

 Angle of Attachment  

∙ Muscle Contractions  

 Concentric: Shortening occurs  

o muscle contracts with greater force than resistance and  shortens If you want to learn more check out How does the criminal justice system respond to crime?
Don't forget about the age old question of What does the thermodynamic variable mean?

 Eccentric: Lengthening occurs  

o muscle contracts with less resistance force less than  resistance and lengthens

 Isometric: No change in length  

o muscle contracts but does not change length

 Isotonic: Same force (tension)

 Isokinetic: Same Speed

 Passive:

o Lengthening  

o Shortening  

o When muscles on one side of a joint are active, the other  side is passive

∙ Muscles Play Different Roles  


What are passive leg exercises?



We also discuss several other topics like Where is the genetic material contained in the nucleus?

 Agonist: Prime Mover

 Antagonist: Opposes the action of agonist Don't forget about the age old question of What is the meaning of population ecology?

 Synergist: Perform or help agonist perform same motion   Stabilizer: Prevents movement at a joint other than where motion is wanted  

 Neutralizer: Eliminates the undesired effect at joint of desired  movement  

∙ Muscle Force

 Max Force (along line of action)

o Physiological Cross-Sectional Area (PCSA)

 Larger cross-sectional area = more sarcomeres =  

more muscle fibers  

 Perpendicular to muscle fibers If you want to learn more check out What is anton van leeuwenhoek's contribution to cell theory?

 Accounts for all of the fibers

o Pennation Angle

 Disadvantage: Limited distance of muscle travel  

 Force Modifiers

o Length (relative to resting length)

o Velocity of Shortening/ Lengthening  

o Activation Level

o Others  

 Factors that Influence Force  

o Temperature: Hot is better because the muscle and  

tendons are more elastic

o Recent stretch history: Sarcomeres at optimal length

o Fatigue: Force production might go down, if lactate and  hydrogen ion production is faster than the body can buffer  causes that “burn”

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