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- Architectural_gear_ratio abstract "Architectural gear ratio, also called anatomical gear ratio (AGR) is a feature of pennate muscle defined by the ratio between the longitudinal strain of the muscle and muscle fiber strain.It is sometimes also defined as the ratio between muscle-shortening velocity and fiber-shortening velocity.AGR = εx/εfwhere εx = longitudinal strain (or muscle-shortening velocity) and εf is fiber strain (or fiber-shortening velocity)In fusiform muscle, the fibers are longitudinal, so longitudinal strain is equal to fiber strain, and AGR is always 1.As the pennate muscle is activated, the fibers rotate as they shorten and pull at an angle. In pennate muscles, fibers are oriented at an angle to the muscle's line of action and rotate as they shorten, becoming more oblique such that the fraction of force directed along the muscle's line of action decreases throughout a contraction. Force output is dependent upon the angle of fiber rotation, so changes in muscle thickness and the vector of change in thickness vary; based upon the force being produced. Due to the rotational motion; pennate muscles operate at low velocities (low shortening distance). The shortening velocity of the pennate muscle as a whole is greater than that of the individual fibers. This gives rise to the property of AGR. Fiber rotation decreases a muscle's output force but increases output velocity by allowing the muscle to function at a higher gear ratio (muscle velocity/fiber velocity). Azizi and Brainerd demonstrated that the gear ratio of pennate muscle can vary; dependent on external load.Segmented musculature, like pennate muscle, has fibers aligned at an angle and due to this feature of design, when muscle fibers increase in angle with respect to the medial axis, along with the direction and amount of muscle bulging, the Architectural gear ratio increases. A variable gear ratio, based upon different anatomical position, loading and movement conditions, has since been dubbed spatially varying gear ratio. The occurrence of spatially varying gear ratio gives rise to a new insight of muscle biology; “inhomogenous muscle mechanics.”One feature of the ratio is that there is an optimal gear ratio for each muscle; as the length-tension and force-velocity relationships describe. Length-tension refers to the max tension that can be created over the muscle fiber strain range and force-velocity refers to the power that is possible of the fiber compared to the shortening velocity. These two features of musculature help to define an optimal AGR for a muscle.".
- Architectural_gear_ratio thumbnail Gray368.png?width=300.
- Architectural_gear_ratio wikiPageID "33963315".
- Architectural_gear_ratio wikiPageLength "17094".
- Architectural_gear_ratio wikiPageOutDegree "26".
- Architectural_gear_ratio wikiPageRevisionID "614297329".
- Architectural_gear_ratio wikiPageWikiLink Anatomical_terms_of_location.
- Architectural_gear_ratio wikiPageWikiLink Angle.
- Architectural_gear_ratio wikiPageWikiLink Aponeurosis.
- Architectural_gear_ratio wikiPageWikiLink Category:Muscular_system.
- Architectural_gear_ratio wikiPageWikiLink Gastrocnemius_muscle.
- Architectural_gear_ratio wikiPageWikiLink Greater_siren.
- Architectural_gear_ratio wikiPageWikiLink Infraspinatus_muscle.
- Architectural_gear_ratio wikiPageWikiLink Line_of_action.
- Architectural_gear_ratio wikiPageWikiLink Medial_axis.
- Architectural_gear_ratio wikiPageWikiLink Medical_ultrasound.
- Architectural_gear_ratio wikiPageWikiLink Muscle_architecture.
- Architectural_gear_ratio wikiPageWikiLink Muscle_contraction.
- Architectural_gear_ratio wikiPageWikiLink Muscle_fascicle.
- Architectural_gear_ratio wikiPageWikiLink Myocyte.
- Architectural_gear_ratio wikiPageWikiLink Pennate_muscle.
- Architectural_gear_ratio wikiPageWikiLink Quadriceps_femoris_muscle.
- Architectural_gear_ratio wikiPageWikiLink Rotator_cuff.
- Architectural_gear_ratio wikiPageWikiLink Shoulder_joint.
- Architectural_gear_ratio wikiPageWikiLink Standard_anatomical_position.
- Architectural_gear_ratio wikiPageWikiLink Subscapularis_muscle.
- Architectural_gear_ratio wikiPageWikiLink Supraspinatus_muscle.
- Architectural_gear_ratio wikiPageWikiLink Teres_minor_muscle.
- Architectural_gear_ratio wikiPageWikiLink Torque.
- Architectural_gear_ratio wikiPageWikiLink Wikt:fusiform.
- Architectural_gear_ratio wikiPageWikiLink File:Gray368.png.
- Architectural_gear_ratio wikiPageWikiLinkText "Architectural gear ratio".
- Architectural_gear_ratio wikiPageWikiLinkText "architectural gear ratio".
- Architectural_gear_ratio wikiPageUsesTemplate Template:Muscle_tissue.
- Architectural_gear_ratio wikiPageUsesTemplate Template:Reflist.
- Architectural_gear_ratio subject Category:Muscular_system.
- Architectural_gear_ratio hypernym Feature.
- Architectural_gear_ratio type Work.
- Architectural_gear_ratio comment "Architectural gear ratio, also called anatomical gear ratio (AGR) is a feature of pennate muscle defined by the ratio between the longitudinal strain of the muscle and muscle fiber strain.It is sometimes also defined as the ratio between muscle-shortening velocity and fiber-shortening velocity.AGR = εx/εfwhere εx = longitudinal strain (or muscle-shortening velocity) and εf is fiber strain (or fiber-shortening velocity)In fusiform muscle, the fibers are longitudinal, so longitudinal strain is equal to fiber strain, and AGR is always 1.As the pennate muscle is activated, the fibers rotate as they shorten and pull at an angle. ".
- Architectural_gear_ratio label "Architectural gear ratio".
- Architectural_gear_ratio sameAs Q4787053.
- Architectural_gear_ratio sameAs m.0hn9m5m.
- Architectural_gear_ratio sameAs Q4787053.
- Architectural_gear_ratio wasDerivedFrom Architectural_gear_ratio?oldid=614297329.
- Architectural_gear_ratio depiction Gray368.png.
- Architectural_gear_ratio isPrimaryTopicOf Architectural_gear_ratio.