Week 2

Question 1

Why do we measure PA?

Answer 1

• Document the prevalence and distribution of PA in entire population groups
  
  • Determine relationships between PAA and health outcomes
  • Identify biological, psychological and environment factors that influence
  • Monitor trends

Question 2

What info do we want/ need about PA

Answer 2

• Frequency
  
  • Intensity
  • Duration
  • Type
  • Domain (why)

Question 3

How is PA measured?

Answer 3

• Pedometers
  
  • Accelerometers
  • Fitness monitors

Question 4

How does an accelerometer work?

Answer 4

Monitors intensity of movement in a specific plane

To count steps while walking, an activity tracker looks for periodic motion with acceleration above a certain threshold

Question 5

Advantages of accelerometer

Answer 5

• Can record many dimensions of PA

- Easy to administer

Question 6

Disadvantages of accelerometer

Answer 6

• Can be expensive

- Some question marks on data reduction/processing