methods of movements analysis
TRANSCRIPT
METHODS OF MOVEMENTS ANALYSIS
BANEET SHARMA
INDEX
MOVEMENT ANALYSIS It is a detailed analysis of movement by
observation or with the help of advanced technology.
TIME TO REVISE BASICS……
WHAT ALL MOVEMENTS OCCURS IN OUR BODY?
IN WHICH PLANES AND AXES THIS MOVEMENTS OCCURS?
THREE PLANES AND THREE AXES
Plane Axis Movements
Sagittal Frontal axis Flexion and extension
Frontal Sagittal axis Abduction and adduction
Transverse Vertical axis Medial and lateral rotation
SPORTS BIOMECHANICS?
‘The study and analysis of human movement patterns in sport’.
WHO IS ANALYSISNG THIS MOVEMENTS?
Sports biomechanists
WE STUDY AND ANALYZE HUMAN MOVEMENT PATTERNS IN SPORT BUT WHY DO WE DO IT?
To help people perform their chosen sporting activity better. • To help reduce the risk of injury.• To educate new generations of sports biomechanists, coaches and teachers.
WHO USES THIS?
Teachers, coaches, athletes, physiotherapists, gait analysts, and judges of ‘artistic’sports, such as ice dance and gymnastics.• ‘Performance analysts’ working with athletes.• Movement coordination researchers
METHODS OF MOVEMENTS ANALYSIS
TWO TYPES
QUALITATIVE
QUANTITATIVE
QUALITATIVE ANALYSIS It is a systematic observation and
introspective judgment of the quality of human movement for the purpose of providing the most appropriate intervention to improve performance .
(knudson and Morrison. 1996:17)
OBSERVATION Defined as the process of gathering,
organizing and giving meaning to sensory information about human motor performance.
INTERVENTION Administration of feedback,
corrections , or other change in environment to improve performance .
PERFORMANCE
The accomplishment of a given task measured against preset known standards of accuracy completeness.
Effectiveness of a person’s movement in achieving a goal.
Qualitative analysis of human movement Duane V. Kundson and Morrison ; 2nd edition
PREPARATION Knowledge of the activity identify critical features goal of the movements
OBSERVATION Gather information from all the senses about a
movement with a systematic observational
strategy.Implement observational
strategy situation
EVALUATION/DIAGNOSISRange of correctness,
strength , weaknesses to select the most
appropriate intervention to improve performance
INTERVENTION feedback, guidance,
modification ,breakdown of complex task in to
simple
QUANTITATIVE ANALYSIS Requires kinematic information (linear
position, velocity, acceleration of body segments) to be obtained from video.
Followed by intervention.
COMPONENTS OF MOVEMENT ANALYSIS planes and axis Technique Video analysis
There are various angles are use to check various injuries.
In Frontal plane ,We can check contra lateral pelvic drop(CPD)
Peak hip adduction angle (HADD)Knee abduction angle (KAbd) Lateral
TECHNIQUES 2D Analysis 3D Analysis
DIFFERENCE :2D Analysis 3D AnalysisWhen analyzing movements that especially occur in a single plane , 2D analysis is used .
If motion occurs in more than one plane, 3D technique is used.
Can be achieved by using a single camera.
More than one cameras are required
Cost effective Very expensive
No need of Special setup . Special setup is required .Easy & time saving method. Time consuming
VIDEO ANALYSIS Video analysis is a technology that
assists the coach in observing an athlete’s technique and providing feedback.
USE OF VIDEO ANALYSIS IN SPORTS ?
Video analysis
Athletes
Improve technique analysis
Improve feedback
Increase motivation
Coaches
Improve technique analysis
Improve communicati
onIncrease efficiency
COMPONENTS OF VIDEO ANALYSIS Initial set up Video system Camera type Camera settings Video recording procedure Digitization Scaling and reconstruction
VIDEO SYSTEM Most common standards used are NTSC
and PAL.
CAMERA SPECIFICATIONS High speed video cameras are used. Pixels
SHUTTER SPEED Shutter speed controls time image
sensor is exposed to light. Shutter: for slow movements 1/250th of
second are used Rapid movements 1/1000th of sec e.g.
motion of golf club around ball strike Focus mode, manual or automatic
VIDEO RECORDING PROCEDURES 2D OR 3D
DURING 2D ANALYSISErrors : know perspective error Error in length.Error in angle .
ERROR IN LENGTH Object behind POM appear smaller. Object in front POM appear larger. So it can be reduced by increasing
camera distance from POM. ALWAYS LOCATE CAMERA AS FAR FROM
POM AS POSSIBLE TO REDUCE THIS ERRON.
ERROR IN ANGLES Movement parallel to POM does not
affects measured angles. Perspective error results in angles
between segments becoming more obtuse when they are moving out of the plane
CALIBRATION OF PLANE OF MOTION Plumb line Bubble level Optical axis needs to be oriented at 90
to the intended plane of motion Can be achieve by placing a bubble
level on the top of the camera position both parallel and perpendicular to its optical axis.
The height of the center of the lens can be measured and a marker placed in the plane of motion at the same height .
A 3-4-5 triangle can be used to ensure that the optical axis is aligned at 90 to the plane of motion in the horizontal plane.
A plumb line should be used to ensure that the apex of the triangle , or a line extending from this point, is positioned directed directly below the center of the lens.
SPECIFICATIONS In condition of poor lighting action should
be illuminated with extra lights positioned at approximately 30 deg to the plane of performance.
Individual should wear minimal and tight fitting clothing.
Joint center can be marked on the skin. Either directly with a soluble pen or using
stickers.
IN 3D ANALYSIS Two or more cameras should be used to
film the activity. Ideally their optical axes should
intersect at approximately 90 deg but this angle can range between 60 to 120 degree.
DIGITIZING It is a process of placing an imaginary
grid over the video field or image with the number of coordinates as pixels.
The no of x and y coordinates that form the digitizing grid is known as the resolution of the digitizing system .
SCALING AND RECONSTRUCTION
Digitized coordinates need to be converted into real life horizontal and vertical positions of body landmarks referred to as scaling
ProgramCountry Computer
platformDartfish TM Swiss PCDV Coach TM US PCV1TM US PCNeat TM US PCQuintic TM US PCSilicon Coach TM US PCSports Coach TM US PCSwinger TM Australian PCSportsCode TM Astralian apple
Current technique-analysis software programs available
REFERENCES P.Grishaw & A.Burden Roger_Bartlett_Introduction_to_Sports_
Biomechani.