There is irrefutable evidence that physical activity has a strong positive effect on health. However, evidence for the impact of physical activity on body composition, aerobic fitness and cardiovascular risk factors in severely obese subjects is lacking.
Place: Norges idrettshøgskole, AUD A
Physical activity and health -obesity
The aim of this study is to determine associations between physical activity and body composition, aerobic fitness and lipoproteins over one-year
The data-collection is performed over a one-year lifestyle intervention for subjects with severe obesity at the Red Cross Haugland Rehabilitation Centre. Measurements of physical activity, diet, body composition, aerobic fitness and lipoproteins are performed at multiple time-points over the study-period. A validation of Actigraph GT1M will be performed using a treadmill-walking protocol.
Change in physical activity was significantly negatively related to body weight, fat mass and atherogenic lipoproteins and positively related to aerobic fitness over one year after controlling for confounding factors. The cut points of 612 and 4780 counts/min for moderate and vigorous physical activity, respectively, was lower than previously defined cut points in young, normal-weight subjects.
Links to studies:
Aadland E, Anderssen SA: Treadmill calibration of the Actigraph GT1M in young-to-middle-aged obese-to-severely obese subjects. Journal of Obesity 2012, 2012:Article ID 318176. (http://www.hindawi.com/journals/jobes/2012/318176/)
Aadland E, Steene-Johannessen J: The use of individual cut points from treadmill walking to assess free-living moderate to vigorous physical activity in obese subjects by accelerometry: is it useful? BMC Medical Research Methodology 2012, 15:172.(http://www.biomedcentral.com/1471-2288/12/172)Aadland E, Jepsen R, Andersen JR, Anderssen SA: Increased physical activity improves aerobic fitness but not functional walking capacity in severely obese subjects. (http://www.medicaljournals.se/jrm/content/?doi=10.2340/16501977-1205&preview=1)