BIOMECHANICS AND MOTOR CONTROL OF HUMAN MOVEMENT
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1 BIOMECHANICS AND MOTOR CONTROL OF HUMAN MOVEMENT Third Edition DAVID Α. WINTER University of Waterloo Waterloo, Ontario, Canada WILEY JOHN WILEY & SONS, INC.
2 CONTENTS Preface to the Third Edition xv 1 Biomechanics as an Interdiscipline Introduction, Measurement, Description, Analysis, and Assessment, Measurement, Description, and Monitoring, Analysis, Assessment and Interpretation, Biomechanics and Its Relationship with Physiology and Anatomy, Scope of the Textbook, Kinematics, Kinetics, Anthropometry, Muscle and Joint Biomechanics, Electromyography, ll Synthesis of Human Movement, References, 12 2 Kinematics Historical Development and Complexity of Problem, Kinematic Conventions, 14 VII
3 viii CONTENTS Absolute Spatial Reference System, Total Description of a Body Segment in Space, Direct Measurement Techniques, Goniometers, Accelerometers, Imaging Measurement Techniques, Review of Basic Lens Optics, /-Stop Setting and Field of Focus, Cinematography, Television, Optoelectric Techniques, Advantages and Disadvantages of Optical Systems, Summary of Various Kinematic Systems, Data Conversion Techniques, Analog-to-Digital Converters, Movie Conversion Techniques, Television Conversion, Processing of Raw Kinematic Data, Nature of Unprocessed Data, Harmonic (Fourier) Analysis, Sampling Theorem, Signal Versus Noise, Smoothing and Fitting of Data, Comparison of Some Smoothing Techniques, Calculation of Angles from Smoothed Data, Limb-Segment Angles, Joint Angles, Calculation of Velocity and Acceleration, Velocity Calculation, Acceleration Calculation, Problems Based on Kinematic Data, References, 57 3 Anthropometry Scope of Anthropometry in Movement Biomechanics, Segment Dimensions, Density, Mass, and Inertial Properties, Whole-Body Density, Segment Densities, Segment Mass and Center of Mass, 62
4 CONTENTS ix Center of Mass of a Multisegment System, Mass Moment of Inertia and Radius of Gyration, Parallel-Axis Theorem, Use of Anthropometric Tables and Kinematic Data, Direct Experimental Measures, Location of the Anatomical Center of Mass of the Body, Calculation of the Mass of a Distal Segment, Moment of Inertia of a Distal Segment, Joint Axes of Rotation, Muscle Anthropometry, Cross-Sectional Area of Muscles, Change in Muscle Length During Movement, Force per Unit Cross-Sectional Area (Stress), Mechanical Advantage of Muscle, Multijoint Muscles, Problems Based on Anthropometric Data, References, 84 4 Kinetics: Forces and Moments of Force Biomechanical Models, Link-Segment Model Development, Forces Acting on the Link-Segment Model, Joint Reaction Forces and Bone-on-Bone Forces, Basic Link-Segment Equations The Free-Body Diagram, Force Transducers and Force Plates, Multidirectional Force Transducers, Force Plates, Special Pressure Measuring Sensory Systems, Synchronization of Force Plate and Kinematic Data, Combined Force Plate and Kinematic Data, Interpretation of Moment-of-Force Curves, A Note About the Wrong Way to Analyze Moments of Force, Differences Between Center of Mass and Center of Pressure, Kinematics and Kinetics of Inverted Pendulum Model, 108
5 χ CONTENTS 4.3 Bone-on-Bone Forces During Dynamic Conditions, Indeterminacy in Muscle Force Estimates, Example Problem, Problems Based on Kinetic and Kinematic Data, References, Mechanical Work, Energy, and Power Introduction, Mechanical Energy and Work, Law of Conservation of Energy, Internal Versus External Work, Efficiency, Positive Work of Muscles, Negative Work of Muscles, Muscle Mechanical Power, Mechanical Work of Muscles, Mechanical Work Done on an External Load, Mechanical Energy Transfer Between Segments, Causes of Inefficient Movement, Cocontractions, Isometric Contractions Against Gravity, Generation of Energy at One Joint and Absorption at Another, Jerky Movements, Summary of Energy Flows, Forms of Energy Storage, Energy of a Body Segment and Exchanges of Energy Within the Segment, Total Energy of a Multisegment System, Calculation of Internal and External Work, Internal Work Calculation, External Work Calculation, Power Balances at Joints and Within Segments, Energy Transfer via Muscles, Power Balance Within Segments, Problems Based on Kinetic and Kinematic Data, References, 154
6 CONTENTS xi 6 Synthesis of Human Movement Forward Solutions Introduction, Assumptions and Constraints of Forward Solution Models, Potential of Forward Solution Simulations, Review of Forward Solution Models, Mathematical Formulation, Lagrange's Equations of Motion, The Generalized Coordinates and Degrees of Freedom, The Lagrangian Function L, Generalized Forces [β], Lagrange's Equations, Points and Reference Systems, Displacement and Velocity Vectors, System Energy, Segment Energy, Spring Potential Energy and Dissipative Energy, External Forces and Torques, Designation of Joints, Illustrative Example, Conclusions, References, Three-Dimensional Kinematics and Kinetics Introduction, Axes Systems, Global Reference System, Local Reference Systems and Rotation of Axes, Other Possible Rotation Sequences, Marker and Anatomical Axes Systems, Example of a Kinematic Data Set, Determination of Segment Angular Velocities and Accelerations, Kinetic Analysis of Reaction Forces and Moments, Newtonian Three-Dimensional Equations of Motion for a Segment, 192
7 xii CONTENTS Euler's Three-Dimensional Equations of Motion for a Segment, Example of a Kinetic Data Set, Joint Mechanical Powers, Sample Moment and Power Curves, Suggested Further Reading, References, Muscle Mechanics Introduction, The Motor Unit, Recruitment of Motor Units, Size Principle, Types of Motor Units Fast- and Slow-Twitch Classification, The Muscle Twitch, Shape of Graded Contractions, Force-Length Characteristics of Muscles, Force-Length Curve of the Contractile Element, Influence of Parallel Connective Tissue, Series Elastic Tissue, In Vivo Force-Length Measures, Force-Velocity Characteristics, Concentric Contractions, Eccentric Contractions, Combination of Length and Velocity Versus Force, Combining Muscle Characteristics with Load Characteristics: Equilibrium, Muscle Modeling, Example of a Model EMG Driven, References, Kinesiological Electromyography Introduction, Electrophysiology of Muscle Contraction, Motor End Plate, Sequence of Chemical Events Leading to a Twitch, Generation of a Muscle Action Potential, 230
8 CONTENTS xiii Duration of the Motor Unit Action Potential, Detection of Motor Unit Action Potentials from Electromyogram During Graded Contractions, Recording of the Electromyogram, Amplifier Gain, Input Impedance, Frequency Response, Common-Mode Rejection, Crosstalk in Surface Electromyograms, Recommendations for Surface Electromyogram Reporting and Electrode Placement Procedures, Processing of the Electromyogram, Full-Wave Rectification, Linear Envelope, True Mathematical Integrators, Relationship Between Electromyogram and Biomechanical Variables, Electromyogram Versus Isometric Tension, Electromyogram During Muscle Shortening and Lengthening, Electromyogram Changes During Fatigue, References, 257 APPENDICES A. Kinematic, Kinetic, and Energy Data 261 Figure A.I Walking Trial Marker Locations and Mass and Frame Rate Information, 261 Table A. 1 Raw Coordinate Data, 262 Table A2(a) Filtered Marker Kinematics Rib Cage and Greater Trochanter (Hip), 265 Table A.2(b) Filtered Marker Kinematics Femoral Lateral Epicondyle (Knee) and Head of Fibula, 269 Table A.2(c) Filtered Marker Kinematics Lateral Malleolus Table A.2(d) (Ankle) and Heel, 273 Filtered Marker Kinematics Fifth Metatarsal and Toe, 277 Table A.3(a) Linear and Angular Kinematics Foot, 281 Table A3(b) Linear and Angular Kinematics Leg, 285 Table A.3(c) Linear and Angular Kinematics Thigh, 289 Table A3(d) Linear and Angular Kinematics ^ HAT, 293
9 xiv CONTENTS Table A.4 Relative Joint Angular Kinematics Ankle, Knee, and Hip, 297 Table A.5(a) Reaction Forces and Moments of Force Ankle and Knee, 301 Table A.5(b) Reaction Forces and Moments of Force Hip, 305 Table A.6 Segment Potential, Kinetic, and Total Energies Foot, Leg, Thigh, and \ HAT, 309 Table A.7 Power Generation /Absorption and Transfer Ankle, Knee, and Hip, 313 B. Units and Definitions Related to Biomechanical and Electroniyographical Measurements 316 Table B.I Base SI Units, 316 Table B.2 Derived SI Units, 316 Index 323
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