Title: Kin 2711: QUALITATIVE ANALYSIS
1Kin 2711 QUALITATIVE ANALYSIS
- March 14, 2005
- Deterministic Models
- Planning for Observation
2Movement analysis
- Identify purpose of skill
- Simplify the skill divide into parts
- Determine the mechanical factors that govern the
parts of the skill - Identify critical features
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4Hays Reading on Deterministic models
How to use the information ???
5Flight height is a function of speed, angle, air
resistance Flight Height is a function of
velocity and air resistance Flight Height is a
function of vertical velocity and air resistance
6Change in Angular momentum is a function of
torque and time
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8A Catalog of Mechanical Factors (McPherson)
LOSE STABILITY - STATIC INSTABILITY MASS
CENTRE OF MASS BASE OF SUPPORT LINE OF GRAVITY
9SPEED
SKIING SPEED STRIDE LENGTH STRIDE RATE
10Class Lab Assignments/Activities
- Assignment 2 DEVELOPMENT OF A DETERMINISTIC
MODEL Due March 21, 2005 - 1st draft of project deterministic model part of
Assignment 2
11Plan for Observation
- Movement observation must be systematic in order
for it to be an effective evaluative tool - An observation plan is designed to relate to a
specific task. Each plan is unique - Observers who try to see everything often end up
perceiving nothing (Barrett, 1979)
12Observation
- Observation is concerned with sensation,
perception, and attention to visual stimulus. - Need for selective attention and the adoption of
filtering strategies to prevent the brain from
being bombarded by sensory input
13Perception is the organization and
interpretation of stimuli from our environment,
mediated by our senses.
- Perception involves organizing, or making sense
out of , our sensory information (Sage, 1984)
14Use of the Senses
- VISION - Primary sense used in QA
- AUDITORY sound of impact, landing, x ski
example - TOUCH can provide a great deal of info about the
performance - KINESTHETIC PROPRIOCEPTION how did the skill
movements feel?
15- Alignment and symmetry
- of vertebral units
- Intersegmental joint mobility
Qualitative Analysis in Chiropractic
16Factors which affect our ability to
perceive/attend/observe
- The ability to selectively attend to pertinent
information is affected by many things. - Distractions result in an inability to maintain
focus - NEED TO RECOGNIZE, ELIMINATE OR MINIMIZE
17External Distractions
- Intensity
- Size
- Contrast
- Speed, complexity, repetition
- Movement
- Teaching area, type and amount of equipment
18SIMPLE VS COMPLEX
REPETITION
19VISUAL DISTRACTIONS IN THE OBSERVATION AREA
20Internal Distractions
- Motivation
- Lack of a visual strategy
- Fear, excitement
- Observer bias, expectancy
21Re-examine critical features
Select of observations
Select scanning strategies
Select position
Develop observation plan
22- Example 5.7
- Observe one replay and observe the amount of knee
flexion at foot plant, at instant of release?? - Observe several more and estimate again
23Scanning Strategies
- Need to be able to search systematically for the
relevant features. Scanning strategies address
the following questions. - 1. In which part of the display do the perceptual
systems need to be oriented - 2. How to observe various critical features -
focus vs scan?
24- 3. Are there any critical features which can be
observed simultaneously? - Group task
25Propulsive Foot
Propulsive Foot
Glide Foot
26Position you must be in the right place at the
right time!
- If vantage point is not considered other
observation techniques may be useless. The
optimum position to view varies from skill to
skill, feature to feature. - Example 3.2
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28Position Guide
- 1. Move around during the observation session.
Different positions provide different info re
critical features - 2. In general the best vantage point is one that
is at right angles to the place of motion - 3. Move far enough away to overcome problems
associated with the speed of the performer moving
across the observers field
29- 4. When movements extends over some distance the
best vantage point is opposite the midpoint of
this distance. The observer must be far away
enough to see the entire sequence. - When focusing on smaller components of the
movement the observer should be quite close to
the performer.
30- 5. If orientation is important observe in a
setting which has horizontal or vertical
reference lines - 6. Position to the outside edge of the teaching
area
31Constraints on performance
- Physiological Muscular strength, power,
endurance, flexibility, and cardiovascular
functioning - Morphological Body size, structure, length of
limbs - Event Constraints may cause the performer to
alter their movements from a mechanically ideal
to a less then ideal performance (Eg
temperature...)
32- Aesthetic Considerations Within a technique, a
performer may use individual modifications such
as unique timing or movements. These unique and
individual adaptations are called style. - For example - run up pattern in high jump
33Acceptable response range
34Readings
- 1. Qualitative Analysis of Human Movement
(Knudson Morrison) - The Range of Correctness for Critical Features
p73-74 - Key Elements in a systematic observational
strategy p86-92 - 2. A Catalog of Mechanical Factors (McPherson)
- (Print this off it will help build your models)
35Lab Session please sign up for one of the
following 3 labs
- Wednesday March 16 1230 -2
- Friday March 18 1230-2
- Wednesday March 23 1230 -2
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