Objectively quantified physical activity and sedentary behavior in predicting visceral adiposity and liver fat

Keating, Shelley E., Parker, Helen M., Pavey, Toby G., Baker, Michael K., Caterson, Ian D., George, Jacob, & Johnson, Nathan A. (2016) Objectively quantified physical activity and sedentary behavior in predicting visceral adiposity and liver fat. Journal of Obesity, 2016, Article Number-2719014.

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Abstract

Objective

  • Epidemiologic studies suggest an inverse relationship between nonalcoholic fatty liver disease (NAFLD), visceral adipose tissue (VAT), and self-reported physical activity levels. However, subjective measurements can be inaccurate and prone to reporter bias.We investigated whether objectively quantified physical activity levels predicted liver fat and VAT in overweight/obese adults.

Methods

  • Habitual physical activity was measured by triaxial accelerometry for four days (n = 82). Time spent in sedentary behavior (MET < 1.6) and light (MET 1.6 < 3), moderate (MET 3 < 6), and vigorous (MET 6 < 9) physical activity was quantified. Magnetic resonance imaging and spectroscopy were used to quantify visceral and liver fat. Bivariate correlations and hierarchical multiple regression analyses were performed.

Results

  • There were no associations between physical activity or sedentary behavior and liver lipid. Sedentary behavior and moderate and vigorous physical activity accounted for just 3% of variance for VAT (p = 0.14) and 0.003% for liver fat (p = 0.96). Higher levels of VAT were associated with time spent in moderate activity (r = 0.294, p = 0.007), but there was no association with sedentary behavior. Known risk factors for obesity-related NAFLD accounted for 62% and 40% of variance in VAT and liver fat, respectively (p < 0.01).

Conclusion

  • Objectively measured levels of habitual physical activity and sedentary behavior did not influence VAT or liver fat.

Impact and interest:

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ID Code: 99674
Item Type: Journal Article
Refereed: Yes
DOI: 10.1155/2016/2719014
ISSN: 2090-0716
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Exercise & Nutrition Sciences
Copyright Owner: 2016 Shelley E. Keating et al.
Copyright Statement: This is an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly
cited.
Deposited On: 04 Oct 2016 23:29
Last Modified: 05 Oct 2016 22:20

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