Lecture 36 Flashcards
Inactivity
what is sedentary behaviour
“any waking behavior performed in a sitting or reclining posture characterized by an
energy expenditure of less than or equal to 1.5 metabolic equivalents.”
what is inactive
not meeting the physical activity guidelines
what is sedentary behaviour
prolonged time sitting or reclining; doing
activities associated with very low energy
expenditure (<1.5 METS)
can you remain active and by sedentary
yes if you complete the physical activity guidelines, but spend the rest of the day sitting down we like to call you an “active couch
potato
what has happened over the last 50 years with incidental activity and why
the amount of incidental activity people do as part of their every day lives has decreased dramatically due to transport, work and domestic life
sitting induces what
muscular inactivity and also neuromuscular and vascular
35.5 MET-h/week is equivalent to how many minutes of moderate activity per week
60-75 minutes
a canadian fitness survey found if you stood for almost all the time at baseline you were …….
45% less likely to die than if you stood almost none of the time
what is the evidence on sitting time and the effect it has on mortality
conflicting evidence
just one day of being sedentary can reduce
reduce brain blood flow (slightly)
just one day of being sedentary can impair
blood flow in the legs
just one day of being sedentary can increase blood
increase blood glucose and increase blood lipids
exercise can improve metabolic and cardiovascular control in ..
pre diabetes
what are the mechanisms for improved glucose control with more frequent movement (glucose)
- regular breaks (contraction) enhances glucose uptake into muscle cell
- more GLUT4 in membrane translocated for longer
what are the mechanisms for improved glucose control with more frequent movement (energy)
- regular breaks (contraction) increases energy use
- greater EPOC with intermittent activity
