MEASURING ANGLES.pptx(relative and absolute angles)

MEASURING ANGLES.pptx(relative and absolute angles, center of gravity)

1. MEASURING ANGLES

2. Introduction to Measuring Angles What is an Angle? Two lines meet at a vertex. Important for studying body movement. Why Measure? Understand joint and muscle function. Helpful in sports and therapy. Methods: Manual: Protractor on images. Video: Analyze frame by frame. Software: Use computer models.

3. Visualizing Joint Angles Body Image Projection : Mark joints and draw lines for body parts. Using a Protractor: Measure angles at joints. Analyze body movement. Applications: Sports performance. Rehabilitation tracking. Modern Tools: Software creates digital models for accuracy.

4. Relative vs. Absolute Angles Relative Angles: Measured between two connected body parts (e.g., knee angle). In anatomical position, all angles are at 0°. Example: Knee flexion: Angle between the thigh and lower leg Shoulder flexion: Arm raised in front of the body (30° flexion). Absolute Angles: Measured from a horizontal or vertical reference line. Describes segment orientation (e.g., trunk flexion). Example: Trunk angle affects muscle effort to maintain posture

5. Tools for Measuring Body Angles Goniometer: A tool like a protractor with arms for angle measurement. How it Works: Fixed arm aligned with one body segment. Movable arm aligned with another segment. Center placed on joint center; read angle from scale. Accuracy Tips: Correct positioning and knowledge of anatomy are crucial. Mark joint centers and axes for repeated measurements.

6. Instant Center of Rotation Dynamic Joint Motion: Bones shift slightly during movement due to surface shapes. Example: Knee joint: Femur moves on the tibia during flexion. Instant Center: Exact rotation center changes with joint movement. Determined through X-rays at various angles. Important for accurate joint motion analysis.

7. Practical Application Clinical Applications: Physiotherapists use goniometers to assess joint health. Helps in diagnosing joint issues and tracking recovery. Sports Science: Analyzing athletes' movements for performance optimization. Enhancing training by understanding joint mechanics.