Podcast: Play in new window | Download
Summary
On episode 14 of 40+ Fitness, Coach Allan digs into two large studies on sedentary behavior, activity levels, and obesity, then turns the data into practical takeaways for anyone spending too much time in a chair.
The first study followed over 50,000 women for six years and found that sitting at work versus sitting in front of the TV had very different effects on obesity risk. The second followed over 16,000 men for nine years and linked TV time and vigorous activity to changes in waist size.
Allan closes with his own standing desk routine and a reminder that the body was built to move, not to sit still.
Links
- https://40plusfitness.com
Key Takeaways
- Sitting at work and sitting watching TV are not equal. Two extra hours of TV sitting per day was linked to a 23% increase in obesity in a JAMA study of over 50,000 women, versus only a 5% increase for two extra hours of sitting at work, likely because work involves more incidental movement and less mindless snacking.
- Mild activity meaningfully lowers obesity risk. Women who added even mild standing and walking saw a 9% decrease in obesity compared to prolonged sitting.
- An hour of brisk walking a day flips the risk. Moving from sitting to an hour of brisk daily walking produced a 23% decrease in obesity, the mirror image of the TV sitting number.
- Vigorous activity shrank men's waistlines. In a nine-year study of over 16,000 men aged 40 to 75, four hours of vigorous activity per week corresponded to a 1.9 millimeter decrease in waist size.
- Heavy TV time expanded men's waistlines. Men who watched 20 hours of TV per week saw their waist size increase by 3 millimeters over the same period, even without major changes to diet.
- Waist size may be a better marker than BMI. Allan argues waist size reflects fat loss more directly than BMI, since BMI can't distinguish added muscle from added fat.
- You don't need expensive gear to move more. A walking partner, a lunchtime loop through the office, or a basic activity tracker app can be enough; Allan uses an adjustable standing desk with a balance ball and balance board at his own office.
- Progression applies to daily movement too. Start with small, doable increases, like shaving a few seconds off a walking lap, rather than jumping straight to intense exercise.
- Movement protects joints, not just weight. Allan notes that clients who feared squatting because of bad knees often found the joint pain eased once they started moving properly, since stiffening from inactivity is part of what causes the pain.
“If you sit, you're going to get fatter. If you move, you're not going to get as fat.”
Coach Allan
Another Episode You May Enjoy
Episode 19 – Alcohol – How It Affects Health and Fitness – Science