Charles E Matthews

..These findings suggest that both lifestyle activities of lower intensity (e.g., walking and doing household chores) and intentional exercise can reduce endometrial cancer risk...

..To develop and test two different short telephone activity recall (STAR) questionnaires, one with closed-ended and the other with open-ended response options, that assessed overall moderate and vigorous activity in a usual week...

..These data provide the first objective measure of the amount of time spent in sedentary behavior in the US population and indicate that Americans spend the majority of their time in behaviors that expend very little energy...

..We examined these relationships in cross-sectional analyses of 157 North American and Chinese women...

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..To evaluate a 12-week home-based walking intervention among breast cancer survivors and to quantify changes in physical activity (PA) behaviors, body weight, and body composition in response to the intervention...

..62, 0.99). These findings add new evidence that overall physical activity levels are an important determinant of longevity, and that health benefit can be obtained through an active lifestyle, exercise, or combinations of both...

..The purpose of this study was to investigate the patterns and correlates of physical activity in middle-aged and elderly women from urban Shanghai...

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..The effects of obesity throughout life on the IGF axis and racial differences in breast cancer risk require study...

..A SNP in CYP19A1 interacted with dietary energy intake in African Americans, and another SNP in CYP191A had an independent association with BMI in Caucasians...

..74; 95% confidence interval, 2.05-12.20). Our study suggests that promotion of behavior patterns that optimize energy balance (weight control and increasing physical activity) may be a viable option for breast cancer prevention...

..This study evaluated the PA questionnaire (PAQ) used in the Southern Cohort Community Study, a prospective investigation of health disparities between African-American and white adults...

..Differences between black and white women in the associations of sedentary and active behaviors and obesity are mostly unknown...

..88). These data indicate that the SWHS PAQ is a reproducible and valid measure of exercise behaviors and that it demonstrates utility in stratifying women by levels of important lifestyle activities (e.g., housework, walking, cycling)...

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..To examine the relationship between smoking and weight status in adult women and whether this association differed by race...

..62-0.77). Results indicate that the Shanghai Men's Health Study PAQ has reasonable reproducibility and validity for classifying men by their level of exercise and nonexercise activities in this cohort...

..76) and high total physical activity (>20.5 MET-h/day). We did not find a statistically significant multiplicative interaction between body size, caloric intake and total physical activity on breast cancer risk...

..This study evaluated the PA questionnaire (PAQ) used in the Southern Cohort Community Study, a prospective investigation of health disparities between African-American and white adults...

..An interaction between disease stage and hormone receptor status and total mortality was noted. Our study suggests that exercise after breast cancer diagnosis may improve overall and disease-free survival...

..Several studies also report that obese men have lower blood PSA levels, suggesting that obesity may be interfering with the ability to detect early-stage prostate cancer...

..With numbers available, failure rates were not significantly different between groups. These findings suggest that graft type may not be the primary determinant for successful outcomes after anterior cruciate ligament surgery...

..A vital step in PA measurement is the classification of daily time into accelerometer wear and nonwear intervals using its recordings (counts) and an accelerometer-specific algorithm...

..Our results demonstrate that a small number of SNPs randomly selected from candidate genes can be used to estimate admixture proportions in African Americans reliably...

..The association between body mass index (BMI) and height on PSA and percentage of free PSA (%fPSA) was investigated within AA and CA men without a prior prostate cancer diagnosis...

..Analysis of naturally occurring changes in body weight can provide valuable insights in improving our understanding of the influence of demographic, lifestyle, and psychosocial factors on weight gain in middle-age adults...

..Sufficiently valid evidence-based information ultimately will help in making decisions regarding patient care...

..Furthermore, the results suggest indirectly that biologic mechanisms related to inflammation may play a role in the beneficial effect of physical activity on the risk of incident adenoma...

..05). Upper-body obesity was related to increased risk among women with low BMI. These results suggest that obesity, particularly upper-body fat deposition, is associated with an increased risk of endometrial cancer...

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..S. citizens met the recommended levels of PA across the United States. In addition, the association between PIA/PA and degree of urbanization in the 4 main U.S. regions (Northeast, Midwest, South, and West) was determined...

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..To examine sources of variance in objective measures of physical activity in a group of healthy adults (N = 92) participating in a physical activity measurement study...

..58 and 0.28, respectively). These findings suggest that physical activity may reduce breast cancer risk through both hormonal and nonhormonal pathways...

..30, 0.005). Body size was not associated with reporting bias in this study. The authors conclude that social desirability and social approval may influence self-reported physical activity on some survey instruments...

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..This paper a) reviews decision rules researchers have used in the past, b) compares the impact of using different decision rules on a common data set, and c) identifies issues to consider for accelerometer data reduction...

..This investigation examined differences in URTI risk between physically inactive and moderately active adults...

..To assess test-retest reliability and validity of the Youth Risk Behavior Survey (YRBS) items for moderate and vigorous physical activity in middle school students...

..The primary aim of this pilot study was to assess how well the combination of global positioning system (GPS) and accelerometer data predicted different activity modes...

..37 and 0.32 at baseline and follow-up, respectively. In general, the PYTPAQ has acceptable reliability and validity for measurement of past-year physical activity that is comparable to that of similar questionnaires...

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..Incorporating individually tailored programs into broader mass media campaigns may be an important next step, and the Internet could be a useful vehicle...

..This work will extend our understanding of the biological mechanisms underlying these causal relationships. ..

..This work will also serve as the basis for submission of competitive R01 proposals by the candidate in latter years of this award. ..

..Collectively, this research will extend our understanding of the influence of measurement errors in PA studies and indicate the next steps necessary to minimize these errors in future studies. ..