12 PA & ObesityJP-1.ppt

12 PA & ObesityJP-1.ppt - The Effects of Physical...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
November 4, 2009, 12:01 am Phys Ed: Why Doesn’t Exercise Lead to Weight Loss? By Gretchen Reynolds The Effects of Physical Activity on Obesity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
150lb, 15% fat = 22.5lbs 22.5lb x 3500kcal = 80,000kcal if use ~2000kcal/day, 40days to deplete all body fat!
Background image of page 2
The myth: Peter lost 31 pounds in 33 days! Reality: Fat is a huge store of calories!
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(Muscle) (prime the pump)
Background image of page 4
Variable: based on amount of PA
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Weight Change = energy intake – energy expenditure Energy conservation If TEF is 10% of expenditure: Intake 2000 cal, TEF = 200 Intake 1000 cal, TEF = 100 ie 1 mi walk @ 200 vs 150 lbs
Background image of page 6
What about diet PLUS exercise?? Can exercise keep the RMR up during wt loss? Physically active Not so much physical activity
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Effects of Diet and Exercise Many have proposed that exercise would reduce the decline in RMR that occurs with caloric restriction. But, if one takes into account much of the data available, (Reading #30, Hill, et al) at least 14 of 17 studies published found that the decrease in RMR is the same in diet only and diet + exercise groups! So exercise may not be effective in attenuating the decrease in RMR with caloric restriction.
Background image of page 8
So… Exercise does not appear to keep RMR from falling with caloric restriction
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What about exercise and TEF?? Appears that exercise may influence TEF, but it may depend on the amount of exercise
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What about “afterburn” Melanson, et al. (2009). Journal of Applied Physiology. In Press LS (n=10), LT (n=10), OS (n=7) men and women 24h energy expenditure at rest and following 1h of acute exercise (55% of VO2max) Participants ate regular meals (maintenance of energy balance) No differences in fat oxidation In any group at rest or Following 1h of exercise So. ..if energy is balanced, there Is no afterburn!
Background image of page 12
physical activity energy expenditure Obviously, should be increased . . . . But if body mass decreases, energy
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/18/2011 for the course KNES 260 taught by Professor Hagberg during the Spring '08 term at Maryland.

Page1 / 42

12 PA & ObesityJP-1.ppt - The Effects of Physical...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online