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SI-H

  1. Common Tests Performed on Muscles Using SI-H Systems
    February 13, 2014
    Length Change Tests (No Force Feedback Required) Tests Components Test Description Parameter Determined Muscle Types Slack SI-H Muscle Research System equipped with: Linear Motor and Motor Control Amplifier Position Commands from MDAC Software Isometric Force Developed at Initial Length → Quick Release to New Length →  Muscle Shortens with No Load →Force Increases as Muscle Slack Taken Up Unloaded Shortening Velocity Tetanized Skeletal Muscle Most Smooth Muscle All Skinned Muscles Constant Velocity Release Isometric Force (Fo) Developed at Initial Length → Muscle Released at Constant Velocity → Constant Force (Fv) Eventually Reached Force Characteristic of Release Velocity Stretch-Quick Release (QR) Isometric Force Developed at Initial Length → Stretch → Quick Release of Muscle (1% to 10% Change in Muscle Length) → Change in Force Rapid Crossbridge Attachment Rates Eccentric Contractions Isometric Force Developed at Initial Length → Stretch Muscle → Release Muscle → Shortens to Same Length with Reduced Force Effects of Excessive Sarcomere Strain Muscle Stiffness Quick Stretch & Release (<1% Change in Muscle Length) → Increase in Length → Decrease in Force Elasticity Constant Stretch/Release or Release/Stretch Release or Stretch @ Various Times during either Contraction or Relaxation Phase of Single Twitch   Cardiac & Skeletal Twitch Muscles   Vibration Protocols (No Force Feedback Required) Tests Components Test Description Parameter Determined Muscle Types Vibration of Steadily Contracted Muscle SI-H Muscle Research System equipped with: Linear Motor and Motor Control Amplifier Position Commands from MDAC Software Isometric Force Developed at Initial Length → Vibrate (Release/Restretch Pulses) → Crossbridges Detach →Muscle Slack (No Force) → Stop Vibration → Return of Isometric Force Crossbridge Detachment Rate Tetanized Skeletal Muscle Most Smooth Muscle All Skinned Muscles Muscle Stiffness Rapid Cyclic Length Changes →Decrease in Force → Unloaded Shortening of Muscle Elasticity Constant Vibration of Twitch Muscles Isometric Force during Twitch → Vibrate Muscle → Crossbridges Detach →Isometric Force Cancelled → Muscle Shortens Unloaded Shortening Velocity Cardiac & Skeletal Twitch Muscles   Constant Load Protocol (Force Feedback Required) Tests Components Test Description Parameter Determined Muscle Types Isotonic Release SI-H Muscle Research System equipped with: Linear Motor and Motor Control Amplifier Constant Load Module Commands from MDAC Software
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