10.10.13 kin 110 disc. notesThe world of inactivityHomeworkSchool workoffice workTransportationEatingDrinkingTelevision- How much do we sit?o Office workers spend about 70% of waking day spent doing sedentary behavioro 8 hrs sleepingo 16 waking hours * 70% = 11.2 hours spent doing nothing with our muscles!- Is sitting bad?o English bus drivers sit all day at work Got heart disesase more frequently and sooner than conductorso Bus conductors (ticket takers) stand and walk all day at work- How bad is sitting?o Epidemiological evidence: large cohort studies, Take a snap shot of a bunch - Epidemiological studyo Overview of tv watching behaviorso Each 2 hr/day increment of sitting Risk for obesity increase by 23% Risk for type 2 diabetes increases by 14%o Sitting time at work Average > 3 hrs per day 25% office workers sat > 6 hrs/day all this sitting at work translates to ~60% risk for obesity- experimental evidenceo early experiments used bed rest as a model of inactivityo effects of bed rest reduced phys. Fitness (vo2max) poor vascular function decreased insulin sensitivity increased fat mass loss of muscle mass and many other negative “side-effects”- can we exercise enough to prevent negative effects of sitting?o We don’t really know just yeto The negative effects of sitting are independent from the benefits of exercise Meaning… Sitting affects different aspects of the body than exercise affects How to combat this?- Taking breaks from sitting?o Npr; sitting all day is worse than you may think- The study that started it allo Waist circumference is an easy way to estimate central adiposityo What does this graph tell you? People who took more Periodic breaks had lower waist circumferences- Better health suggested- More active at desk?o Standing desko Tallo Treadmill connected to desk- Does it matter what you do during your break from sitting?- How many calories do you actually burn if you take lots of breaks at work?o What is phys. Activity compendiumo Bird watching, slow walko Marching mod. Speedo Marching rapidlyo Pushing strollero Pushing wheel chair- (MET value) * (3.5) * (body weight in kg) /200= kcal/min- Jim-
View Full Document
Unlocking...