Week 6: Physical Inactivity and SB

Question 1

What is the general trend of PA levels through age groups?

Answer 1

As per the AIWH you are less likely to meet the PA guidelines weekly the older you get

Starts from approx 50% in 18-24YO

Shifting down towards 40% for older adults

Question 2

What is the definition of Physical Activity?

Answer 2

Any waking activity characteristed by an energy expenditure of < (or equal to) 1.5 METS

Question 3

What is the common relationship between screen time and mortality?

Answer 3

Increased screentime has an increased risk of mortality

Study showed more than 4 hours screen time attributed to a 1.54 hazards ratio of all cause mortality

Question 4

Relationship between SB and CVD

Answer 4

After 8 hours of SB per day causes an increase in risk of CVD

Question 5

Relationship between SB and Cancer risk

Answer 5

6-21% higher risk of cancer mortality for low PA group

For those that do less PA and have increased SB levels are at a greater risk of cancer mortality

Question 6

Relationship between SB, PA and all cause mortality

Answer 6

Mortality is highest for those in the lowest 3rd of MVPA irrespective of the SB level

As MVPA decreased there was a transient increase in risk of death –> Greater risk of mortality as SB increased

Question 7

What is the result from replacing 1 hour sitting with 1 hour standing?

Answer 7

Stamatakis et al 2015 illustrated that there is a 5% reduction in risk of all cause mortality, per hour spent standing as opposed to sitting