Physical activity intensity and visceral adiposity: a randomized controlled trial
| dc.contributor.author | Hay, Jacqueline | |
| dc.contributor.examiningcommittee | Duhamel, Todd (Kinesiology and Recreation Management) Walker, John (Clincical Health Psychology) | en_US |
| dc.contributor.supervisor | McGavock, Jonathan (Kinesiology and Recreation Management) Ready, Elizabeth (Kinesiology and Recreation Management) | en_US |
| dc.date.accessioned | 2013-02-05T19:45:31Z | |
| dc.date.available | 2013-02-05T19:45:31Z | |
| dc.date.issued | 2012-09 | en_US |
| dc.degree.discipline | Kinesiology and Recreation Management | en_US |
| dc.degree.level | Master of Science (M.Sc.) | en_US |
| dc.description.abstract | Background: Physical activity (PA) reduces visceral adipose tissue (VAT) in adults; however, the dose to reduce VAT in youth is unclear. Objective: To examine whether high intensity PA preferentially reduces waist circumference (WC) and VAT compared to lower intensity PA. Design: Randomized controlled trial. Participants: Youth were 13-18yrs, overweight, with one additional risk factor for type 2 diabetes (T2DM). Intervention: 6-months, exercising 3 times/week at a high intensity (70-85% of Heart Rate Reserve HRR), or low intensity (40-55% HRR). Primary outcome: VAT (cm2) measured by MRI at L4-L5, and WC at the height of the iliac crest (cm). Results: 94 Youth were randomized to either high intensity (n=30); low intensity (n=32) or control (n=32). Changes in WC and VAT were not significant across groups. A trend towards a reduction in VAT in the training groups, compared to controls was demonstrated in sub-analysis (-14.3 ± 9.6 % vs. +0.01 ± 0.4 %, p= 0.059). Peak fitness increased significantly in both the high and low intensity arms (1.3 ± 0.6 and 1.4 ± 0.6 ml/kg/min, p < 0.05). Conclusions: Training at 55-65% HRR improves fitness by ~10%, and ~2 days/week elicits modest non-significant reductions in VAT in overweight youth. | en_US |
| dc.description.note | May 2013 | en_US |
| dc.identifier.citation | Hay, J., Maximova, K., Durksen, A., Carson, V., Rinaldi, R. L., Torrance, B., et al. (2012). Physical Activity Intensity and Cardiometabolic Risk in Youth. Archives of Pediatrics & Adolescent Medicine, 1-8. | en_US |
| dc.identifier.uri | http://hdl.handle.net/1993/16315 | |
| dc.language.iso | eng | en_US |
| dc.publisher | American Medical Association | en_US |
| dc.rights | open access | en_US |
| dc.subject | exercise | en_US |
| dc.subject | visceral | en_US |
| dc.subject | youth | en_US |
| dc.subject | adipose | en_US |
| dc.title | Physical activity intensity and visceral adiposity: a randomized controlled trial | en_US |
| dc.type | master thesis | en_US |