The purpose of this research was to examine five methods of determining frame size. In addition, self perception of frame size and of desired weight was compared to two height-weight table recommendations. Pearson correlation coefficients were calculated to determine relationships between measurements used as criteria for frame measures and between the five frame measures studied. Agreement of frame size identification was examined by comparing percentages of small, medium and large frame for each method. While the Pearson correlation coefficient of wrist circumference with elbow breadth was greater than 0.5 for both men and women, the correlations between frame measures using wrist circumference criteria and frame measures using elbow breadth criteria were less than 0.5. Self-perceived frame size was not significantly correlated with any of the five frame measures examined or with weight perception variables. Comparison of weight perception with evaluation of measured weight using two height-weight tables indicated men appear to desire to be heavier and women appear to desire to be thinner than weights recommended for height and measured frame size. Results were discussed in relation to findings of other researchers. Recommendations were made concerning the frame measures examined, the relationship of frame size perception to self-evaluation of weight, and the use of height-weight tables in determining weight goals. / Master of Science

Yes / Seasonal or photoperiodically sensitive animals respond to altered day length with changes in physiology (growth, food intake and reproductive status) and behaviour to adapt to predictable yearly changes in the climate. Typically, different species of hamsters, voles and sheep are the most studied animal models of photoperiodism. Although laboratory rats are generally considered nonphotoperiodic, one rat strain, the inbred Fischer 344 (F344) rat, has been shown to be sensitive to the length of daylight exposure by changing its physiological phenotype and reproductive status according to the season. The present study aimed to better understand the nature of the photoperiodic response in the F344 rat. We examined the effects of five different photoperiods on the physiological and neuroendocrine responses. Young male F344 rats were held under light schedules ranging from 8 h of light/day to 16 h of light/day, and then body weight, including fat and lean mass, food intake, testes weights and hypothalamic gene expression were compared. We found that rats held under photoperiods of ≥ 12 h of light/day showed increased growth and food intake relative to rats held under photoperiods of ≤ 10 h of light/day. Magnetic resonance imaging analysis confirmed that these changes were mainly the result of a change in lean body mass. The same pattern was evident for reproductive status, with higher paired testes weight in photoperiods of ≥ 12 h of light/day. Accompanying the changes in physiological status were major changes in hypothalamic thyroid hormone (Dio2 and Dio3), retinoic acid (Crabp1 and Stra6) and Wnt/b-Catenin signalling genes (sFrp2 and Mfrp). Our data demonstrate that a photoperiod schedule of 12 h of light/day is interpreted as a stimulatory photoperiod by the neuroendocrine system of young male F344 rats.

In recent years, there has been a growing interest in feeding phytogenic products to poultry for their growth and health benefits. The objective of this experiment was to determine the effects of a phytogenic feed additive on turkey poult performance and digestive physiology over a 6-week brooding period. In total, 864 male Hybrid Converter turkey poults were obtained from a local commercial hatchery on day-of-hatch and placed into floor pens with clean pine shavings. The treatments were randomly assigned including an industry-type corn-soybean meal positive control (PC), a similar diet with a 1.5% reduction in crude protein and key amino acids (NC), or the NC with the addition of Digestarom® (PFA) included at a rate of 1 g/kg. Body weight gain (BWG), feed intake (FI), feed efficiency (FE), and mortality were recorded throughout the experiment. On day 14 poults fed the PFA had significantly higher BWG compared to the PC and NC fed birds. By day 42 birds fed the PC and PFA diets had significantly higher BWG compared to the NC, and the PC had significantly higher FE compared to the NC and PFA fed birds. No differences in FI or mortality were observed throughout the experiment. There were no significant differences in AMEn, crude protein digestibility, or nutrient transporter or pancreatic enzyme mRNA expression among treatments. However, aminopeptidase activity tended to be lower in the ileum of poults fed the PC or PFA diets compared to the NC, suggesting that the PFA may be improving protein utilization. / Master of Science / Recent regulations and customer demand have severely restricted the use of antibiotics in poultry production. Historically, antibiotics have been included in poultry diets at sub-therapeutic concentrations to improve performance and reduce disease incidence. Since this restriction, producers have experienced increased feed conversion ratio, decreased body weights, and increases in morbidity and mortality. Not only does this present an animal welfare issue, but producers experience decreased profits due to the decrease in performance associated with restricted antibiotic use. Many researchers are investigating the ability of alternative feed additives to help mitigate the lost performance this restriction has caused. One such alternative is a class of compounds known generally as phytogenic feed additives. These are herbs, spices, and associated products which can be included into the diet at relatively low concentrations. Previous research has demonstrated the ability of phytogenic feed additives to positively influence performance and gastrointestinal tract health, primarily in broiler chickens. Therefore, the objective of this thesis is to investigate the effect of a commercially available phytogenic feed additive on the performance, nutrient digestibility, and absorption in turkey poults over the first six weeks of feeding. Previous indications with this product seem to indicate that it also increases protein utilization so this product was evaluated using a reduced protein diet. By day 14, poults fed the feed additive had significantly higher body weights compared to both the positive and negative control. At the conclusion of the experiment on day 42, the birds fed the feed additive had significantly higher body weight compared to the negative control and were similar to the positive control. This suggests the ability of the feed additive to improve performance when dietary protein is reduced. Data from aminopeptidase activity in the ileum suggest a potential improvement in the efficiency of protein utilization, which may explain the performance improvements when poults were fed the phytogenic feed additive.

Master of Science / Department of Human Nutrition / Tandalayo Kidd / Weiqun Wang / The number of overweight and obese college students in the United States has remained high, which could be related to the comfort food and beverages consumed. Sugar-sweetened beverages and fried potatoes are beverages and comfort food commonly consumed by college students. Furthermore, people’s behavior is affected by their perceptions and goals. Thus, this study aimed to assess the correlations between the perception, goal of body weight, and sugar-sweetened beverages and fried potatoes consumption behaviours of college students. A cross-sectional survey of 371 college students was conducted via a self-reporting questionnaire that included information related to sugar-sweetened beverages and fried potato consumption behavior in the past month. The involved students also described their body weight perception and future goal. Spearman correlation and Chi-square analyses were performed to examine the associations. There were significant associations (p<0.0001) between perception of body weight and goal of body weight, regular soda consumption and other sweetened beverage consumption, regular soda consumption and fried potato consumption, and other sweetened beverage consumption and fried potatoes consumption. In addition, there were significant correlations between goals of body weight and other sweetened beverage consumption (p=0.0370). These findings confirmed that perception of body weight was associated with goal of body weight and provided a significant importance for educational intervention to students on improving awareness of healthy body weight and eating.

For adolescents, body weight can be a complicated and sometimes difficult issue. Though the majority of adolescents report being aware of normative gendered body ideals, how adolescents incorporate or reject these ideals into their own weight-control decisions or sense of self can vary dramatically, largely in reaction to their social experiences with body ideals in the local, immediate contexts of their daily lives. The role of one such local context - schools - has remained largely unexplored in existing literature. Using the National Longitudinal Study of Adolescent Health (Add Health) and multi-level modeling, I investigate the role high school weight cultures play in the development of adolescents’ weight-loss behaviors, overweight self-perceptions, and self-esteem. I employ social comparison theories, specifically the idea of who may serve as a likely target for social comparison - general others, similar others, or high status others - to develop hypotheses about which aspects of the school context may be associated with various aspects of adolescents’ body weight. Overall, my results indicate that there is a strong relationship between adolescents’ weight-loss behavior, self-perception and self-esteem and the weight-related culture in the school. For example, adolescent boys, on average, are significantly less likely to report perceiving themselves as overweight or engaging in weight-loss behaviors when they attend schools where there are many overweight boys in the student body. I also find that there is some variation within the school in terms of which peers are most salient to adolescents’ behaviors and self-perceptions. Both boys and girls are particularly impacted by the values and behaviors of similar others, when similarity is defined by same-sex adolescents of a similar body size. For example, on average, overweight adolescent girls are significantly more likely to report engaging in weight-loss behaviors when a higher proportion of overweight girls in their school also are engaged in weight-loss behaviors. The same pattern is found among adolescent boys. Overall, these findings suggest that meso-level social contexts - like schools - may be particularly important to how individuals incorporate macro-level beliefs or values - like gendered body ideals - into their own behaviors and self-concepts. / text

Thesis (M.S.)--University of Michigan, 1996.

Thesis (M.S.)--University of Michigan, 1996.

yes / An increase in obesity is usually accompanied by an increase in eating disturbances. Susceptibility to these states may arise from different combinations of underlying traits: Three Factor Eating Questionnaire (TFEQ) Restraint and Disinhibition. Two studies were conducted to examine the interaction between these traits; one on-line study (n=351) and one laboratory-based study (n=120). Participants completed a battery of questionnaires and provided self-report measures of body weight and physical activity. A combination of high Disinhibition and high Restraint was associated with a problematic eating behaviour profile (EAT-26), and a higher rate of smoking and alcohol consumption. A combination of high Disinhibition and low Restraint was associated with a higher susceptibility to weight gain and a higher sedentary behaviour. These data show that different combinations of Disinhibition and Restraint are associated with distinct weight and behaviour outcomes.

Approximately half of all reported laminitis cases are the result of “grass founder” (laminitis associated with long-term over consumption of lush, early spring pastures). Elevated body weights (BW), body condition scores (BCS), and blood glucose concentrations have all been associated with the onset of grass founder. Plasma fructosamine concentrations (PFC) have recently been used as an indicator of long-term (14–21 d), mean blood glucose concentrations in horses and numerous authors have reported that elevated PFC were observed in laminitic horses (Murphy et al., 1997; Keen et al., 2004; Knowles et al., 2012). This study was conducted to evaluate the long-term effects of transitioning from an ad-libitum tall fescue hay diet in late winter to an adlibitum tall fescue pasture diet in early spring on parameters associated with grass founder in horses. Five mature stock horse mares were given free choice access to good quality tall fescue hay for 18 weeks before initiation of data collection. Each horse acted as their own control. PFC were determined on day 1, day 128, and then monitored at 14 d intervals for the following 84 d (February 26th through May 21st). Three trained lab technicians evaluated BW and BCS on day 1, 128, 170 and 212 of the trial. The horses were placed in a 20 acre field where their diets consisted of free choice access to hay only for 156 days (DTP1) followed by free choice access to tall fescue hay with minimal access to some early emerging tall fescue pasture for 14 days (DTP2), and finally to free choice access to lush spring tall fescue pasture only for the final 42 days (DTP 3) when the animals refused to eat offered hay. Mean PFC were highest (P < 0.01) for DTP1 and decreased with each successive transition to DTP2 and DTP3. This may have been due to increased insulin secretion associated with the pasture only diet. Mean BCS at the beginning of the trial was 5.7 and increased throughout the trial (P < 0.001) to a value of 7.8. BCS associated with the pasture only diet were higher (P < 0.001) than those associated with the free choice hay and hay plus pasture diets. Mean BW increased (P < 0.05) from 1199 lbs. to 1268.3 lbs. during the 12-week trial. Mean weight gain was 113 lbs. with an average daily gain of 1.35 lbs./day. No incidence of laminitis was observed.

This study was to develop normative data of isotonic muscular strength in college females using the Spartacus model Universal Gym bench press and leg extension and to control for the influence of body weight. Two hundred and two college age females enrolled in weight training and conditioning classes used the Universal Gym for twelve weeks. Subjects were tested for maximum strength on 2 exercises and their percent body fat was calculated. Pearson-product moment correlations between lean body weight , body weight and the bench press test and the leg extension test were correlated. After statistically controlling for the effects of body weight, percentile ranks were calculated for both tests.