Energy expenditure is a key component of energetics, and physical activity comprises the largest modifiable component of energy expenditure. Energy expenditure and physical activity are strongly related to insulin resistance and other markers of glycemic control important for cancer risk. Sedentary behavior has also recently emerged as an independent predictor of metabolic risk, and temporal analyses of objective sedentary behavior data have indicated that breaks in sitting time may be a critical intervention strategy to complement improvements in moderate to vigorous physical activity. In the last decade, the impact of the built environment has also been assessed in relation to physical activity, sedentary behavior and weight status. This research, however, has focused on a static view of residential neighborhood which may be confounding the relationship between health and place. We propose to advance the field of energy expenditure, physical activity, and sedentary behavior assessment across the cancer continuum by improving the accuracy of energy expenditure-related assessments in our TREC projects #2 and #3. We will use state ofthe art acceierometers with simultaneous heart rate recording to improve the accuracy of measuring physical activity, sedentary behavior, and energy expenditure. In addition to branched equation modeling techniques we will also use new computational approaches for analyzing data streams from these devices, including artificial neural networks that allow comtjining these data to decipher the frequency,intensity, duration, and type of physical activity and sedentary behavior so as to optimally characterize behaviors of study participants and reduce the measurement noise in observed relationships between these behaviors and markers of glycemic control. Finally, data from Global Positioning System devices that track the temporal and spatial movements of participants will be combined with existing Geographic Information Systems data for San Diego County to allow us to develop obesogenic environmental exposure estimates and relate these to the metabolic risk factors. These data will be processed through software developed by our group under the NIH Gene &Environment Initiative. This will enable us to use novel computational techniques to assess the relationships over time and across the study arms between energy expenditure, physical activity and sedentary behavior and metabolic risk factors related to breast cancer measured in Projects #2 as well as the moderating effect of exposure to obesogenic environments.
This study will advance the field of energy expenditure and daily activity assessment through objective monitoring, while improving the accuracy of energy expenditure-related assessments in our TREC projects #2 and #3. The study crosses multiple disciplines including public health, exercise science, computational science and urban planning. This study will increase our understanding ofthe behavioral mechanisms of energetics and cancer risk and will help to identify opportunities for targeted interventions.
|Kerr, Jacqueline; Patterson, Ruth E; Ellis, Katherine et al. (2016) Objective Assessment of Physical Activity: Classifiers for Public Health. Med Sci Sports Exerc 48:951-7|
|Le, Tran; Flatt, Shirley W; Natarajan, Loki et al. (2016) Effects of Diet Composition and Insulin Resistance Status on Plasma Lipid Levels in a Weight Loss Intervention in Women. J Am Heart Assoc 5:|
|James, Peter; Jankowska, Marta; Marx, Christine et al. (2016) "Spatial Energetics": Integrating Data From GPS, Accelerometry, and GIS to Address Obesity and Inactivity. Am J Prev Med 51:792-800|
|Fernandez, Marina O; Sharma, Shweta; Kim, Sun et al. (2016) Obese neuronal PPARÎ³ knock-out mice are leptin sensitive but show impaired glucose tolerance and fertility. Endocrinology :en20161818|
|Marinac, Catherine R; Nelson, Sandahl H; Breen, Caitlin I et al. (2016) Prolonged Nightly Fasting and Breast Cancer Prognosis. JAMA Oncol 2:1049-55|
|Schmitz, Kathryn H; Gehlert, Sarah; Patterson, Ruth E et al. (2016) TREC to WHERE? Transdisciplinary Research on Energetics and Cancer. Clin Cancer Res 22:1565-71|
|Chung, Heekyung; Chou, Winjet; Sears, Dorothy D et al. (2016) Time-restricted feeding improves insulin resistance and hepatic steatosis in a mouse model of postmenopausal obesity. Metabolism 65:1743-1754|
|Patterson, Ruth E; Marinac, Catherine R; Natarajan, Loki et al. (2016) Recruitment strategies, design, and participant characteristics in a trial of weight-loss and metformin in breast cancer survivors. Contemp Clin Trials 47:64-71|
|Mitchell, Jonathan A; Godbole, Suneeta; Moran, Kevin et al. (2016) No Evidence of Reciprocal Associations between Daily Sleep and Physical Activity. Med Sci Sports Exerc 48:1950-6|
|Cho, Chang Gun; Pak, Kwang; Webster, Nicholas et al. (2016) Both canonical and non-canonical NF-ÎºB activation contribute to the proliferative response of the middle ear mucosa during bacterial infection. Innate Immun :|
Showing the most recent 10 out of 31 publications