Transcript Chapter 03

Chapter 03
Principles of Assessment, Prescription, and
Exercise Program Adherence
Principles of Assessment, Prescription, and
Exercise Program Adherence
Responsibilities of an Exercise Specialist
• Educating Clients / Health Screenings
• Pre-exercise screening
• Fitness test administration and evaluation
• Exercise Prescription
• Exercise Counseling
• Exercise Leadership
• Exercise Adherence
Principles of Assessment, Prescription, and
Exercise Program Adherence
Components of Physical Fitness
Summary
• Cardiorespiratory Endurance
• Musculoskeletal Fitness
• strength
• endurance
• Body Composition
• Flexibility
• Balance
Principles of Assessment, Prescription, and
Exercise Program Adherence
Cardiorespiratory Endurance Testing
• Utilize clinical testing
• Max GXT on treadmill, bike, or arm ergometer
• Assess maximum oxygen consumption
• Measure peak work performance
• Determine any indication of cardiovascular compromise
• Utilize field testing
• Sub maximal GXT, usually 3-4 stage test, target HR
• Assess heart rate response per stage
• Predict maximum aerobic capacity
Principles of Assessment, Prescription, and
Exercise Program Adherence
Musculoskeletal Fitness
• Utilize clinical testing
• Determine Peak Force Production (Specialized Apparatus and
software)
• Analyze force cuvre shape and magnitude
• Determine any signs of weakness or instability
throughout the ROM
• May be combined with EMG to determine motor unit
function.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Musculoskeletal Fitness
• Utilize field testing
• Use or 1-RM or Multiple RM systems
• Individualized testing for both strength and endurance
for all muscle groups
•Easy test-retest system
•Determine proper lift mechanics
Principles of Assessment, Prescription, and
Exercise Program Adherence
Body Composition
• Clinical Testing
• Densitometry – Hydrostatic Weighing, Bod-Pod.
• Assess the percentage of Fat vs. Lean Body Mass
• Field Testing
• Anthropometry
• Height
• Weight
• BMI
• Circumference Measures (W/H rations)
Principles of Assessment, Prescription, and
Exercise Program Adherence
Flexibility
• Clinical Testing
• Goniometry (both digital / software, and manual)
• Joint specific / bilateral comparisons
• Field Testing
• Instruments to more general body regions
• Sit and Reach Test
• Shoulder Flexibility Test
Principles of Assessment, Prescription, and
Exercise Program Adherence
Purpose of Fitness Testing ( see list of tests)
• Determine present level of fitness
• Determine improvements in fitness
• Determine test / retest reliability
• Determine presence of disease
• Client Motivation / Adherence
• Collection of Data / Research
Principles of Assessment, Prescription, and
Exercise Program Adherence
Recommended Testing Order
1) Non-Exercise Data Collection
• HHQ, Informed Consent
• Resting BP and Heart Rate
• Anthropometry
• Body Composition
• Blood Chemistry
• Resting ECG
• Pulmonary Functions
• Nutrition Information
• Risk Factor Assessment
Principles of Assessment, Prescription, and
Exercise Program Adherence
Recommended Testing Order
2) Exercise Data Collection
Order:
• Cardiorespiratory Endurance
• Muscular Fitness
• Flexibility / Balance
Principles of Assessment, Prescription, and
Exercise Program Adherence
Exercise Test Environment
• Stress free environment to combat client
pre-test anxiety
• Ambient Temp = 21 to 23o C
• All equipment should be calibrated and prepared
• Conversation and attention should focus on the client
Principles of Assessment, Prescription, and
Exercise Program Adherence
Test Validity (stats help)
• Does the test measure what it is supposed to measure ?
• What are the reference / criterion measures ?
• Is the test a direct or indirect measurement ?
• Validity coefficient (ry1y2 values) ( relationship between the
criterion and the predicted score )
•The difference between the criterion and the predicted
is the residual score. (Typical Field Test: r > 0.80 )
• SEE measures the accuracy of the prediction as the
average degree of deviation of each predicted score,
likewise, it is used to quantify the accuracy of the
prediction equation.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Test Validity
• The regression is the prediction equation that accounts
for the criterion and the residual.
• thus, the line of best fit is the method of determining
the actual scores while accounting for the
residual error
Line of best fit and SEE (prediction error).
Principles of Assessment, Prescription, and
Exercise Program Adherence
Sensitivity and Specificity of the Exercise Test (see pg 42,
Text)
Sensitivity = Measure disease (risk factors )
when present
Specificity = Measure no disease (risk factors )
when not present
Principles of Assessment, Prescription, and
Exercise Program Adherence
Sensitivity and Specificity
Disease Present
Disease Not Present
True Positive
False Positive
Test Positive
False Negative
True Negative
Test Negative
Principles of Assessment, Prescription, and
Exercise Program Adherence
Test Reliability
• Are the results reproducible?
• What is the reliability coefficient for:
•Intra-tester
•Inter-tester ( Test Objectivity )
Principles of Assessment, Prescription, and
Exercise Program Adherence
Prediction Equation Evaluation ( See Table 3.1, p 43.)
• What is the criterion measure?
• What was the size and type of sample for
the prediction equation (spec. population or general)?
• Multiple Correlations {MC}( sample size / predictor)
• What are the individual predictors?
• What are their “weights” – individual
correlation coefficients ?
• What and how were the data collected for the MC’s?
•Population Specific, or generalized?
• Has the equation been cross validated on another
sample?
Line of identity and total error (prediction error).
Figure 3.2, p. 45
The total error (TE) is the average degree of deviation of individual data
points from the line of identity. ( The line of identity has a slope of 1.0 and a y-intercept
equal to 0. ). When an equation closely predicts the actual or measured scores
of the cross-validation sample, individual data points fall close to the line of
identity.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Constant Error : difference between the predicted and actual
means (actual = criterion)
• Determined during cross-validation.
• Are the Mean + SD of Criterion and Sample Different?
• Dependent t-test for same (the prediction equation is
for the general population.
• Large Significant difference = bias (over or underestimation)
Individual Accuracy – see figure 3.3 , p 46. (next slide)
(Test of Difference)
Bland-Altman plot with 95% limits of agreement.
Figure 3.3, p.46
In the example in figure 3.3, the predictive accuracy of the equation for
estimating the actual %BF of individual clients is approximately ±6% BF (note
the upper and lower limits of agreement on the y-axis of the graph).
Test Validity, Reliability, and Objectivity -
Summary
Apply all of the following evaluation criteria when selecting field tests and
prediction equations that indirectly assess the physical fitness of your
clients:
■ An acceptable method is used to derive reference measures of the physical
fitness component.
■ A large sample (N = 100-400) and 20 to 40 subjects per predictor variable are
used to develop the equation.
■ The sizes of the multiple correlation and validity coefficients exceed 0.80.
■ The group prediction errors (SEE and TE) are acceptable (see table 3.1).
■ Demographic characteristics (e.g., age, gender, race, fitness status) of the
validation and cross-validation samples are described. (continued on next slide)
Test Validity, Reliability, and Objectivity -
Summary
Apply all of the following evaluation criteria when selecting field tests and
prediction equations that indirectly assess the physical fitness of your
clients:
■The prediction equation is cross-validated in the original study or on independent
samples from other studies.
■ The constant error (bias), or difference between the measured and predicted
means for the cross-validation sample, is not statistically significant.
■ The 95% limits of agreement are acceptable (see table 3.1).
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Pre-Test Preparation
■ Wear comfortable clothing, socks, and athletic shoes if
available.
■ Drink plenty of fluids during the 24 hr. period before the test.
■ Refrain from eating, smoking, and drinking alcohol or caffeine
for 3 hr. prior to the test.
■ Do not engage in strenuous physical activity the day of the test.
■ Get adequate sleep (6 to 8 hr.) the night before the test.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Principles of Fitness (read definitions and discuss practical applications
for each)
•Specificity of Training
•Overload
•Progression
•Initial Values
•Interindividual Variability
•Diminishing Returns
•Reversibility
Why is it important for your client to know these principles?
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Art of Rx
•Mode = type (see also Table 3.2, p. 49)
•Intensity = how hard
Inversely Related
•Duration = how long
•Frequency = how often
•Exercise Volume = total calories (sum of the above)
•Exercise Progression = building finished product
Stages of Exercise Rx Progression
•Initial stage (6-8 weeks)
•Improvement stage ( 4-8 months)
•Maintenance Stage ( 8 months +)
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence
Of those individuals starting an exercise program, almost 50% will drop out
within 1 yr. As an exercise specialist, you must help the client to develop a
positive attitude toward physical activity and to make a firm commitment to the
exercise program. To increase adherence, you need to be aware of factors related
to exercise attrition.
Exercise specialists play an important role in educating the public about why
regular physical activity is absolutely essential for good health and how to
exercise safely and effectively.
Many factors influence regular participation in physical activity and adherence to
an exercise program (see table 3.3, next slide)
You should focus on
factors that are
potentially modifiable
such as exercise
facilities; program
variables (e.g.,
exercise intensity and
perceived exertion);
enjoyable scenery
during exercise; and
support from spouse,
family, friends, and
peers.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Models / Theories for Enhancing Adherence
■ Behavior modification
■ Health belief model
■ Social cognitive model
■ Transtheoretical model of health behavior change
(stages of motivational readiness
for change)
■ Decision-making theory
■ Theory of reasoned action and theory of planned behavior
■ Self-determination theory
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Behavior Modification Model
With use of the behavior modification model, clients become
actively involved in the change process by setting realistic
short- and long-term goals, developing a plan to achieve
these goals, and signing a contract that describes each goal
and how it may be achieved. Throughout the exercise
program, you should provide your client with feedback and
revise the plan as needed.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Health Belief Model
The health belief model is based on the assumption that
individuals will engage in exercise on a regular basis
because they perceive the threat of disease and believe that
this threat is severe and that they are susceptible to
disease. When the benefits outweigh the barriers,
individuals will take action and adopt exercise into their
lifestyle.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Social Cognitive Model
The social cognitive model is based on the concepts of selfefficacy and outcome expectation. The likelihood that people
will engage in a specific behavior, like exercising regularly,
depends on their self-efficacy or perception of their ability to
perform the task, and their confidence about making the
behavioral change.
Techniques to improve your client’s exercise self-efficacy
include performance mastery, modeling, positive
reinforcement, and emotional arousal.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Transtheoretical Model
The five stages of motivational readiness in terms of
changing exercise behavior: 1. Precontemplation: Client
does not exercise and does not intend to start exercising.
2. Contemplation: Client is not exercising but intends to
start. 3. Preparation: Client is exercising but is not
meeting the recommended amount of physical activity.
4. Action: Client has been performing the recommended
amount of exercise regularly for less than 6 mo.
5. Maintenance: Client has been exercising regularly at the
recommended amount for 6 mo. or longer.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Decision Making Theory
Individuals decide whether or not to engage in a behavior by
weighing the perceived benefits and costs of that behavior.
Clients are more likely to exercise when they perceive that the benefits
outweigh the costs (e.g., “I feel better about myself when I exercise
even though it takes time from my busy schedule”). Clients in early
stages of motivational change (e.g., precontemplation stage) tend to
perceive more disadvantages compared to clients in later stages (e.g.,
action stage) of change.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Reasoned Action Theory
According to this theory, intention is the most
important determinant of behavior; intention is highly
influenced by the individual’s attitudes and subjective
behavioral norms.
Subjective behavioral norms, or perceptions about
what others think or believe about exercise, also
may influence your client’s intention
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Planned Behavior Theory
The theory of planned behavior extends the theory of
reasoned action by taking into consideration the client’s
perception of behavioral control (i.e., perceived power and
control belief). This theory proposes that individuals
intend to perform a specific behavior (e.g., exercising) if
they evaluate it positively (e.g., attitude), believe that
others think it is important (subjective norms), and
perceive the behavior to be under their control (e.g.,
power).
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Self-Determination Theory
The self-determination theory describes how the presence or absence
of specific psychological needs (i.e., autonomy, competence, and
relatedness) affects behavior through a continuum of motivation.
According to this theory, four levels of motivation with respect to
exercise may be identified:
1. Amotivation
2. Other-determined motivation
3. Self-determined extrinsic motivation
4. Intrinsic motivation
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Self-Determination Theory
1. Amotivation - The individual has no intention or desire
to engage in exercise.
2. Other-determined motivation - The individual is
motivated to exercise by outside factors such as rewards,
guilt, fear, or pressure; long-term adherence is unlikely.
Possible motives for exercising may be “I exercise to lose
weight” or “My partner thinks I should exercise more.”
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Exercise Adherence - Self-Determination Theory
3. Self-determined extrinsic motivation - The individual values
exercise, is motivated by extrinsic factors like improved health or
gains in fitness, and freely chooses (i.e., autonomously) to exercise
without a sense of outside pressure
4. Intrinsic motivation - The individual engages in exercise for the
sheer enjoyment and satisfaction it brings to his or her sense of wellbeing; enjoying exercise for its own sake leads to adherence.
The ultimate goal of this approach is to get clients to value physical
activity and to think of themselves as exercisers rather than using
exercise to attain an external goal like weight loss.
Principles of Assessment, Prescription, and
Exercise Program Adherence
Physical Fitness Tests: Administration and Interpretation
Other Adherence Strategies (see also info. boxes on p.54)
• Physician Support
• Spousal / Family Support
• Moderate Exercise Progression (motivation curve)
• Test – Retest
• Fitness Games
• Progression Charts / Photos
• Client Reward Systems
• Testimonials
• Education Sessions
• Newsletters
Principles of Assessment, Prescription, and
Exercise Program Adherence
Information beginning at “Using Technology To Promote Physical
Education to the end of the chapter is FYI…
END OF PRESENTATION