KIN 3309 1nd Edition Lecture 22 Outline of Last Lecture I. Biomechanics vs. KinesiologyII. Linear vs. Angular MotionIII. Kinematics vs. KineticsIV. Statics vs. DynamicsV. Relative PositionsVI. Flexion & ExtensionVII. Abduction & AdductionVIII. Specialized Movement DescriptorsIX. Movement Descriptors of FootX. Pronation & Supination of the FootXI. Cardinal PlanesXII. Stress and StrainXIII. Stress-Strain CurveXIV. Musculoskeletal SystemXV. Functions of the SkeletonXVI. Architecture of BoneXVII. Types of Bone TissueXVIII. Types of BonesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.XIX. CartilageXX. Articular Cartilage & FibrocartilageXXI. LigamentsXXII. Synovial JointXXIII. MuscleXXIV. Functions of MuscleXXV. Characteristics and Roles of MuscleXXVI. MyofibrilXXVII. SarcomereXXVIII. Muscle Volume and Cross SectionXXIX. Net Muscle ActionsXXX. Muscle AttachmentXXXI. Organization of the Nervous SystemXXXII. Motor UnitXXXIII. Recruitment & Rate CodingXXXIV. Electromyography (EMG)XXXV. ReflexXXXVI. Proprioceptive ReceptorsXXXVII. The Shoulder ComplexXXXVIII. The Vertebral ColumnXXXIX. Effects of Aging on the TrunkOutline of Current Lecture I. Electromyography (EMG)II. Accelerometers/IMUCurrent LectureI. Electromyography (EMG)a. Correct placement of electrodes is criticalb. Electrodes oriented parallel to muscle fiberc. Prepare skin by:i. Shaving ii. Abradingiii. Cleaning with alcohold. Signal must be amplifiede. Sample rate > or equal to 1,000 Hz requiredf. Ratificationi. Taking the absolute value of raw signal (no negatives)g. Linear envelopei. Rectify and LPFii. Time domainh. Frequency domaini. Electromechanical delay (EMD)i. Temporal delay between onset of EMG signal and development of muscletensionj. EMG to investigate which muscle group is used in a certain phase of gaitk. Determine activation orderl. Raw or rectified EMG signalII. Accelerometers/IMUa. Most accelerometers operate on a mass-spring systemi. Micro electro-mechanical systems (MEMS)ii. Suspended or usually in a vacuum (not fluid, like video)b. Useful for detecting angular accelerations, not all are sensitive to linear accelerationsc. Gyroscopes best for measuring rotationsi. Another MEMS that operates under similar inertial principlesii. Rapidly oscillating/vibrating mass d. IMUs combine accelerometers, gyroscopes, and possibly others (e.g. magnetometers, static pressure sensors) to accurately measure motioni. Triad of accelerometers (tri-axial)ii. Triad of
View Full Document
Unlocking...