1 / 17

Measuring PA

Measuring PA. What aspects of PA do we measure?. Timeframe – day, week, month etc. Sport and exercise vs PA Domains Leisure time - household / gardening Active transport - occupation FITT Frequency - intensity Time (duration) - type (domain). Measurement of PA - complex.

alair
Download Presentation

Measuring PA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Measuring PA

  2. What aspects of PA do we measure? • Timeframe – day, week, month etc. • Sport and exercise vs PA • Domains • Leisure time - household / gardening • Active transport - occupation • FITT • Frequency - intensity • Time (duration) - type (domain)

  3. Measurement of PA - complex • Many tools available • Objective and subjective measures • Practicality vs accuracy trade off • With increasing accuracy of measurement comes less practicality – with more practical measures (like a survey) comes less accuracy…

  4. Measuring POPULATIONS • Predominantly self-report measures • Self report – how much PA did you do today? • Task specific diary or log • Recall surveys • Subjective measures of assessing PA levels

  5. ADVANTAGES & DISADVANTAGES

  6. Measuring INDIVIDUALS • Behavioural observation • Pedometers • Accelerometers • Heart rate telemetry • Double labelled water • GPS

  7. Behavioural Observation • Observers watch subjects & record behaviours of interest – in person or from video recording • Count people / participants • Document types, frequency & duration of PA • Assess occupational activities • Assess PA of young children • Document nature of PA in specific settings TRAINED RECORDERS – therefore objective.

  8. ACCELEROMETERS • Motion monitors or sensors • Measures a range of movements • Intensity of movement • Amount of movment (frequency & duration) • Digitises accelerations of the body in counts per minute • Reliable and valid predictor of heart rate and energy expenditure

  9. ACCELEROMETERS

  10. PEDOMETERS • Step counters • Detect and ‘count’ vertical accelerations • Some able to calculate: • Distance walked (input stride length) • Calories expended (input weight and age)

  11. ADVANTAGES • SMALL LIGHTWEIGHT & NON INVASIVE • INEXPENSIVE • EASY TO ADMINISTER TO LARGE GROUPS • CAN BE USED IN WIDE RANGE OF SETTINGS – SCHOOL, WORKPLACE AND COMMUNITY • LOW TO MODERATE SUBJECT BURDEN • INCREASES AWARENESS – GIVES IMMEDIATE FEEDBACK

  12. DISADVANTAGES • ASSESSES ONLY ONE PHYSICAL ACTIVITY BEHAVIOUR (walking or running) • RELIABILITY MUST USE GOOD QUALITY • MOST CANNOT RECORD FREQ OR DURATION • REACTIVITY • CANNOT DETECT STATIONARY ACTIVITY OR ISOMETRIC ACTIVITY • ESTIMATES OF ENERGY EXPENDITURE BASED ON ADULT STUDIES.

  13. HEART RATE MONITORING

  14. ADVANTAGES • LOW PARTICIPANT BURDEN (if worn for short amounts of time) • FULL DAY STORAGE CAPACITY FOR MIN BY MIN MONITORING (freq, intensity and duration) • LINEAR RELATIONSHIP B/W HR, EE AND O2 CONSUMPTION • QUICK AND EASY DATA COLLECTION

  15. DISADVANTAGES • EXPENSIVE FOR LARGE GROUPS • DISCOMFORT IF WORN FOR LONG TIME • USEFUL ONLY FOR AEROBIC ACTIVITIES • FACTORS SUCH AS AGE, BODY SIZE, PROPORTION OF MUSCLE MASS UTILISED, EMOTIONAL STRESS & CARDIOVASCULAR FITNESS ARE NOT TAKEN INTO ACCOUNT • HR LAGS – IN CHANGES OF DIRECTION –THEREFORE NOT IDEAL FOR CHILDREN

  16. DOUBLE LABELLED WATER • USED TO ESTIMATE ENERGY EXPENDITURE • SUBJECT IS GIVEN ISOTOPES ORALLY – THEN MONITORED VIA URINE SAMPLES • VERY ACCURATE MEASURE OF EE • CAN BE USED WITH ANY AGE GROUP • NON INVASIVE • VERY EXPENSIVE - $2000 PER PERSON

More Related