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Anatomical Kinesiology week 3 notes

by: Annaliese Kehoe

Anatomical Kinesiology week 3 notes HES207

Marketplace > Colorado State University > Anatomical Kinesiology > HES207 > Anatomical Kinesiology week 3 notes
Annaliese Kehoe

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About this Document

These notes cover more fibers, muscle contractions, and some force
Anatomical kinesiology (HES 207,Section 002)
Jennifer C Richards, PhD)
Class Notes
Force, muscle, fibers, contractions
25 ?




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This 2 page Class Notes was uploaded by Annaliese Kehoe on Thursday September 8, 2016. The Class Notes belongs to HES207 at Colorado State University taught by Jennifer C Richards, PhD) in Fall 2016. Since its upload, it has received 5 views. For similar materials see Anatomical kinesiology (HES 207,Section 002) in Anatomical Kinesiology at Colorado State University.

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Date Created: 09/08/16
Anatomical Kinesiology: HES 207 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 o Creates a moment arm  Angle of Attachment  Muscle Contractions  Concentric: Shortening occurs o muscle contracts with greater force than resistance and shortens  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  Agonist: Prime Mover  Antagonist: Opposes the action of agonist  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  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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