Post on 19-Jan-2016
MEASURING MEASURING PHYSICAL ACTIVITYPHYSICAL ACTIVITY
Week 3Week 3
What you need to knowWhat you need to know
The difference between The difference between subjective and objective subjective and objective methodsmethods
What are: self-report, heart rate What are: self-report, heart rate telemetry, pedometry telemetry, pedometry accelerometry, observational accelerometry, observational tools?tools?
What are the advantages and What are the advantages and disadvantages of each method?disadvantages of each method?
IntroductionIntroduction
Why would the general population Why would the general population want to measure physical activity?want to measure physical activity?
It can be quite a difficult taskIt can be quite a difficult task There are a number of options to There are a number of options to
assess physical activityassess physical activity They are usually grouped as eitherThey are usually grouped as either
Subjective: our own perceptionsSubjective: our own perceptions Objective: solid data or observationsObjective: solid data or observations
Each method has a range of Each method has a range of advantages and disadvantagesadvantages and disadvantages
This includes practicality v. accuracyThis includes practicality v. accuracy
Subjective Methods of Subjective Methods of Measuring Physical ActivityMeasuring Physical Activity
Self report: Self report: DiaryDiary Log bookLog book Self-administered recallSelf-administered recall Interviewer-administered recallInterviewer-administered recall Proxy reportsProxy reports
ActivityActivity
Over the next week you are Over the next week you are required to keep a diary of all required to keep a diary of all the physical activity you the physical activity you participate inparticipate in
Think about the domains of Think about the domains of activity (occupational, activity (occupational, household, active transport, household, active transport, leisure)leisure)
Record information on F, I, D, TRecord information on F, I, D, T
Subjective Methods of Subjective Methods of Measuring Physical ActivityMeasuring Physical Activity AdvantagesAdvantages
Quick and easyQuick and easy Cost effectiveCost effective Suitable for Suitable for
individuals, individuals, small or large small or large groupsgroups
Can be Can be quantitative and quantitative and qualitativequalitative
DisadvantagesDisadvantages Reliability and Reliability and
validity validity problemsproblems
Relies on Relies on honestyhonesty
Not suitable for Not suitable for those with those with cognitive cognitive limitations limitations (young and (young and elderly)elderly)
Objective Methods of Objective Methods of Measuring Physical ActivityMeasuring Physical Activity
Heart rate telemetryHeart rate telemetry PedometryPedometry AccelerometryAccelerometry Observational toolsObservational tools
Heart Rate TelemetryHeart Rate Telemetry
Records ______ _____ Records ______ _____ ________ (bpm) on a watch and ________ (bpm) on a watch and can be transferred to a can be transferred to a computercomputer
There is a ___________ There is a ___________ between HR and energy between HR and energy expenditureexpenditure
Heart Rate TelemetryHeart Rate Telemetry
AdvantagesAdvantages Strong link to Strong link to
energy energy expenditureexpenditure
Low participant Low participant burdenburden
Clear in Clear in describing I, F, describing I, F, DD
Quick and easy Quick and easy data collectiondata collection
DisadvantagesDisadvantages Expensive for Expensive for
large numberslarge numbers Some Some
discomfortdiscomfort Restricted to Restricted to
aerobic aerobic activitiesactivities
Influenced by Influenced by other factors other factors (age, stress, (age, stress, emotions)emotions)
PedometryPedometry
Device that records the _______ Device that records the _______ of steps taken and estimates the of steps taken and estimates the stride length (distance) and stride length (distance) and energy expenditureenergy expenditure
Worn on the hipWorn on the hip Responds to vertical forcesResponds to vertical forces For health benefits you should For health benefits you should
be aiming for _______ be aiming for _______ steps/daysteps/day
PedometryPedometry
AdvantagesAdvantages In-expensiveIn-expensive Small, lightweight, Small, lightweight,
non-intrusivenon-intrusive Useful in a variety Useful in a variety
of settingsof settings Easy to administerEasy to administer Measures a Measures a
common activitycommon activity Immediate Immediate
feedbackfeedback Potential to Potential to
promote behaviour promote behaviour changechange
DisadvantagesDisadvantages Assesses only Assesses only
walkingwalking Cannot record F, I, Cannot record F, I,
DD Participant Participant
tamperingtampering Potential to be Potential to be
reactive reactive (participant (participant increases activity increases activity due to being due to being monitored)monitored)
AccelerometryAccelerometry
Motion sensors worn on the hip Motion sensors worn on the hip to assess the ___________ of to assess the ___________ of the body in certain directionsthe body in certain directions
Provides detail on F, I, DProvides detail on F, I, D Provides minute-by-minute dataProvides minute-by-minute data Detects movement ________Detects movement ________
AccelerometryAccelerometry
AdvantagesAdvantages Small, Small,
lightweight and lightweight and non-invasivenon-invasive
Clear in Clear in describing F, I, describing F, I, DD
Simple, quick Simple, quick data collectiondata collection
Records in real Records in real time (minute by time (minute by minute)minute)
DisadvantagesDisadvantages Expensive for Expensive for
large groupslarge groups Inaccurate Inaccurate
assessment of assessment of some activitiessome activities
Can’t specify T Can’t specify T of activityof activity
Observational ToolsObservational Tools
Watching people’s _________ Watching people’s _________ within specific settingswithin specific settings
Can collect data across a range Can collect data across a range of areas: F, I, D, Tof areas: F, I, D, T
A variety of methodsA variety of methods BEACHESBEACHES SOFITSOFIT SOPLAYSOPLAY
Observational ToolsObservational Tools
AdvantagesAdvantages Excellent Excellent
qualitative and qualitative and quantitative dataquantitative data
Specific physical Specific physical activity behaviours activity behaviours can be observedcan be observed
Useful in a variety Useful in a variety settingssettings
Easily combined Easily combined with software with software packagespackages
Can collect Can collect contextual contextual informationinformation
DisadvantagesDisadvantages Training needed Training needed
for observerfor observer Presence of Presence of
observer may bias observer may bias behaviourbehaviour
Highly labour Highly labour intensive and time intensive and time consumingconsuming
Summary of Methods of Summary of Methods of Measuring Physical ActivityMeasuring Physical Activity
Complete the Complete the summary tablesummary table