Linear Kinematics_v3
Page 1: Kinematics Overview
Kinematics: Subdivision of Biomechanics focusing on motion descriptions in exercise and sports.
Covers: Linear and angular positions, displacements, velocities, speeds, and accelerations.
Importance of Kinematics:
Determines winners in sports (e.g., races, long jump).
Helps analyze movement techniques (e.g., overhand throw).
Facilitates comparison of performance metrics (elite vs. novice).
Aids in understanding movement-related forces through Kinetics.
Example: Calculating joint torque during resistance exercises requires knowledge of displacement and acceleration.
Advancements in Kinematic Measurements:
Utilization of camera systems (e.g., SportVu for NBA, FIFA) to track 3D movements.
GPS equipment in field sports like football and soccer.
Innovations in fitness tracking devices (e.g., GymAware, FitBit) for monitoring performance.
Next Steps in Study: Introduction to anatomical reference terminology leading to discussion of position, velocity, and acceleration interrelations.
Page 2: Anatomical Reference Terminology
Purpose: Establish a common language for describing movement, ensuring precise communication among healthcare and fitness professionals.
Anatomical Position:
Body standing erect, arms at side, palms facing forward, feet together.
Anatomical Planes:
Sagittal Plane: Divides the body into right and left sections. Common movements: walking, running.
Frontal Plane: Divides the body into anterior and posterior sections. Common movements: jumping jacks, cartwheels.
Transverse Plane: Divides the body into superior and inferior sections. Common movements: pirouettes, trunk twists.
Cardinal Planes: Sagittal, frontal, and transverse planes are orthogonal to each other, each separated by 90°.
Page 3: Movements and Axes
Planes: Can be further described as mid-sagittal, mid-frontal, and mid-transverse if they bisect the body.
Anatomical Axes:
Anteroposterior Axis: Runs front to back. Movements: running forward.
Mediolateral Axis: Runs side to side. Movements: side shuffles in basketball.
Longitudinal Axis: Runs vertically. Movements: vertical jumps.
Relative Reference System: Planes and axes move with the body, adjusting with its movements (e.g., swimming).
Diagonal Plane: Movements that do not align with cardinal planes, such as a golf swing.
Page 4: Directional Reference Terminology
Directional Terms:
Lateral: Away from the midline.
Medial: Towards the midline.
Superior: Towards the head.
Inferior: Towards the feet.
Anterior: Towards the front.
Posterior: Towards the back.
Distal: Further from the trunk.
Proximal: Closer to the trunk.
Joint Actions:
Sagittal plane movements: Flexion and extension.
Flexion: Decreasing angle between two segments.
Extension: Returning to anatomical position.
Hyperextension and Hyperflexion: Movements beyond typical ranges of motion.
Page 5: Frontal Plane Movements
Frontal Plane Definitions:
Abduction: Moving away from the midline.
Adduction: Moving towards the midline.
Ankle movements: Inversion (sole inward) and Eversion (sole outward).
Valgus and Varus Deviations: Terms for knee joint rotations.
Valgus: Lateral rotation results in knock-kneed stance.
Varus: Medial rotation results in bow-legged stance.
Page 6: Trunk and Neck Movements
Lateral Flexion: Trunk and neck movements classified in the frontal plane.
Transverse Plane Movements:
Joint rotations about a longitudinal axis: Internal and External Rotation.
Supination and Pronation reference forearm rotations.
Foot Movements: Abduction and adduction in a transverse plane context.
Circumduction: Tracing a circle through joint rotation combining movements across multiple planes.
Page 7: Foot Movement During Gait
Pronation and Supination in Gait:
Pronation: Combination of dorsiflexion, abduction, and eversion during weight-bearing.
Supination: Combination of plantarflexion, adduction, and inversion during toe-off.
Page 8: Types of Motion
Types of Motion:
Linear Motion: Movement all points on a body in the same direction. Includes Rectilinear (straight path) and Curvilinear (curved path).
Angular Motion: Rotation where all points on the body rotate through the same angle.
General Motion: Combination of linear and angular motion.
Page 9: Linear Kinematics Introduction
Linear Motion Descriptions:
Position: Determined by a reference system.
Reference Systems: Absolute (fixed to earth) vs. Relative (fixed to moving body).
Position Vectors: Used to locate points in space; include magnitude and direction.
Page 10: Position Vectors and Scalars
Position Vectors: Communicate distance and orientation; essential in biomechanical analysis.
Scalar vs. Vector:
Vector: Quantity with magnitude and direction.
Scalar: Quantity with only magnitude.
Page 11: Displacement and Distance
Displacement: Change in position over time (vector quantity).
Distance: Total length of path traveled (scalar quantity).
Examples: Distinction between athletic performance and distance covered (e.g., laps on a track).
Page 12: Reference System for Player Movement
Reference System Analysis:
Tracking player movements for calculating displacement and distance.
Discussed case study of an American Football player during a kickoff return, emphasizing displacement and distance calculation.
Page 13: Velocity and Speed
Velocity: Vector quantity representing the rate of change of position.
Formula: v = ∆r/∆t.
Mixed components for understanding motion in projectile contexts.
Speed: Scalar quantity representing magnitude of velocity.
Examples in athletics and simple determination calculations.
Page 14: Average and Instantaneous Values
Average Velocity/Speed: Change over larger time windows.
Instantaneous Velocity/Speed: Change over brief time windows.
Examples illustrating tracking during races and determining peak activity.
Page 15: Pace Definition and Conversions
Pace: Inverse of speed, commonly expressed in minutes per distance.
Calculation of pace from speed with practical examples for runners.
Acceleration: Change in velocity over time, emphasizing directional implications and interactions with force.
Page 16: Understanding Acceleration
Acceleration Dynamics: Illustrated with direction-based movement and examples.
Practical Visualization: Application in assessing athletic performance during explosive movements, like jumps.
Page 17: Observational Movement Analysis
Movement Assessment: Using sequential images to understand acceleration in activities such as barbell snatches.
Page 18: Acceleration Insights
Application in Assessments: Importance of visualizing acceleration during dynamic movements for training and performance.
Page 19: Linear Kinematic Applications
Importance of Kinematic Relationships: Key applications focusing on tracking and analyzing motion in physical activities.
Page 20: Physical Activity Trackers Definition
Physical Activity Trackers: Devices monitoring activity levels through various sensor technologies, enhancing personal tracking and health awareness.
Page 21: Pedometers vs. Accelerometers
Basic Devices: Pedometers solely count steps, while accelerometers measure acceleration, intensity, and monitor sleep patterns.
Page 22: Linear Position Transducers Overview
LPT Usage: Devices for tracking barbell or athlete positioning in strength training.
Discussion of different types of tracking technologies available.
Page 23: Applications of Linear Position Transducers
Velocity Based Training: Usage of LPT to gauge explosive strength and assess training progress without exhaustive testing.
Page 24: Projectile Motion Basics
Definition: Objects in flight under gravitational forces.
Equations of motion applied for quantitative assessment of jumping and throwing biomechanics.
Page 25: Solving Projectile Problems
Analytical Approaches: Steps for analyzing projectile motion characteristics and applications in sports testing.