Biomedical subjects
Paula Ziegler
Publications and source records attributed to Paula Ziegler.
Physical activity among children attending preschools.
OBJECTIVES: Obesity rates are increasing among children of all ages, and reduced physical activity is a likely contributor to this trend. Little is known about the physical activity behavior of preschool-aged children or about the influence of preschool attendance on physical activity. The purpose of this study was to describe the physical activity levels of children while they attend preschools, to identify the demographic factors that might be associated with physical activity among those children, and to determine the extent to which children's physical activity varies among preschools. METHODS: A total of 281 children from 9 preschools wore an Actigraph (Fort Walton Beach, FL) accelerometer for an average of 4.4 hours per day for an average of 6.6 days. Each child's height and weight were measured, and parents of participating children provided demographic and education data. RESULTS: The preschool that a child attended was a significant predictor of vigorous physical activity (VPA) and moderate-to-vigorous physical activity (MVPA). Boys participated in significantly more MVPA and VPA than did girls, and black children participated in more VPA than did white children. Age was not a significant predictor of MVPA or VPA. CONCLUSIONS: Children's physical activity levels were highly variable among preschools, which suggests that preschool policies and practices have an important influence on the overall activity levels of the children the preschools serve.
Longitudinal calcium intake is negatively related to children's body fat indexes.
OBJECTIVE: To determine if dietary calcium was negatively related to children's body fat (BF), if BF indexes and calcium intakes changed over time, and to identify variables related to BF and calcium intake. DESIGN: Percent BF and kg BF were assessed by dual energy x-ray absorptiometry (DEXA) in 8-year-old children. In a prospective design, height, weight, dietary intakes, and related variables were monitored longitudinally from ages 2 months to 8 years during in-home interviews. SUBJECTS: Fifty-two white children, (n=25 boys, 27 girls) participated in a longitudinal study with their mothers. At 8 years of age, mean BMI was 17.3+/-2.1 (standard deviation) for boys and 17.1+/-2.5 for girls. ANALYSES: Regression analysis of all variables, followed by further regression analysis on selected models. RESULTS: At 8 years, percent BF was 22.7+/-6.7 for boys and 26.2+/-7.9 for girls, as assessed by DEXA. Dietary calcium (mg) and polyunsaturated fat intake (g) were negatively related to percent BF (P=.02 to.04) in 3 statistical models, which predicted 28% to 34% of the variability in BF among children. Variables positively associated with percent BF were total dietary fat (g) or saturated fat (g), female gender, sedentary activity (hours/day), father's BMI, and mothers' percent BF. Calcium intakes were significantly correlated over time. Dietary variety was positively related to calcium intake, and intakes of carbonated beverages and other sweetened beverages were negatively related. APPLICATIONS/CONCLUSIONS: Children should be strongly encouraged to regularly include calcium-rich foods and beverages in their diets.
Nutritional status of teenage female competitive figure skaters.
OBJECTIVE: To assess the nutritional status of female competitive figure skaters during preseason, competitive season, and off-season. SUBJECTS: Eighteen female competitive figure skaters, age range 14 to 16 years, from the New England region. STATISTICS: Data was analyzed by repeated measures analysis of variance, Duncan Multiple Range Tests, one-sample t tests, and confidence intervals. DESIGN: Nutrient intakes were determined from 3-day diet records. Body composition was assessed through heights, weights, and underwater weighing. Blood samples were drawn for analysis of selected indexes of nutritional status. RESULTS: Height and weight did not differ significantly among the seasons. Body fat was 1.1 kg higher off-season compared with preseason. Energy intake over the 3 seasons did not vary significantly (mean preseason: 1,678 kcal/day; competitive season, 1,630 kcal/day; off-season: 1,673 kcal/day) (P>.05). During the competitive season 78%, 50%, and 44% of the skaters had intakes less than 67% of RDA for folate, iron, and calcium, respectively. Most of the biochemical indexes of nutritional status were within normal limits. CONCLUSIONS: The results indicate that teenage female skaters have relatively low energy intake and inadequate intakes of certain nutrients, which may account for some of the observed seasonal variations in blood markers of nutritional status. These findings point to the need for nutrition education for these athletes, especially during their competitive season when nutritional status may be compromised.
Do food-related experiences in the first 2 years of life predict dietary variety in school-aged children?
OBJECTIVE: To determine if food-related experiences in the first 2 years of life predict dietary variety in school-aged children. DESIGN/SETTING: Child/mother pairs were interviewed 7 or 8 times when children were 2 to 24 months using a randomized incomplete block design to schedule interviews. Each child/mother pair was interviewed when the child was ages 6, 7, and 8 years. PARTICIPANTS: Child/mother pairs (n = 70) were continuous participants in the longitudinal study. MAIN OUTCOME MEASURES: Dependent variables were children's vegetable and fruit dietary variety, assessed from 3 days of dietary data at ages 6, 7, and 8 years. Independent variables from the first 2 years of life were selected from the longitudinal data set. ANALYSES: General linear models. Adjustments for age that vegetables (or fruits) were introduced in the diet. RESULTS: Vegetable variety in the school-aged child was predicted by mother's vegetable preferences, R2 =.084. Fruit variety in the school-aged child was predicted by breast-feeding duration and either early fruit variety (R2 =.254) or fruit exposure (R2 =.246). CONCLUSIONS/IMPLICATIONS: Nutrition education messages for mothers should emphasize the importance of early food-related experiences to school-aged children's acceptance of a variety of vegetables and fruits.
What Do Infants Really Eat?
This article compares the feeding practices of healthy infants reported by their mothers in studies spanning two decades. Nutrient intakes are largely adequate and feeding practices are changing to meet recommendations, but breast-feeding rates do not meet public health guidelines.