Visual analysis of an object's size can be used to determine the lifting forces we program to lift the object so that the resulting movements achieve the goals of the lift. These forces are scaled or specified prior to the object moving, that is, before sensory feedback information about the object's weight is available. Sensorimotor memories are relied on to provide relevant information about an object's density and weight if the object was previously manipulated. It is well established that young adults accurately scale their forces based on visual size cues. The purpose of this study was to determine if old adults scale their forces to the size of the object or if they rely on sensorimotor memory of the previous object's weight. There are reports of impaired visuomotor programing for grasp and lift in old adults. In the present study old and young subjects were required to lift four different sized bottles of constant density from a force plate and then place the object on a shelf. Two experiments were performed. Experiment one featured blocks of lifts for three bottles in the following order: large, small and medium. Experiment two took place fifteen minutes after experiment one and featured a bottle slightly larger than the medium bottle used at the end of the experiment one. The second experiment addressed whether imperceptible changes in size cause changes in predictive force scaling. Peak load force rate in the first force pulse (prior to lift-off) was measured for each lift of the objects with the focus being on the initial and last lift of each bottle. Both experiments presented a significant effect for bottle size on lift force rates. This result was found regardless of age. It provides additional support that young adults accurately scale their lift force rate based on the visual size cues of the object. Old adults also demonstrated scaling of their lift force rates based on bottle size which failed to support the hypothesis that old adults would merely reproduce their lift force rates from the previous lift with a different object. While both young and old scale lift forces to object size, the old demonstrated a trend for utilizing high lift force rates throughout the experiment as well as greater differences in lift force rate between the initial lift with an object and the final lift with the same object. Most subjects utilized a target strategy in which they produced a single peak lift force rate pulse. This is indicative of a neural representation of the weight of the object being utilized to program the lift force rate. The remaining subjects exhibited a probing strategy that features several step-wise increases in lift force rate until the object is lifted off. This represents a more cautious approach to lifting novel objects. Our results indicate that old adults, much like young adults, are able to scale their forces based on visual size cues.

Purpose: To assess the historical changes in the size and age of the US women’s Olympic gymnastics teams from 1956 to 2008. Methods: The official records from the US Olympic Committee and USA Gymnastics of Olympic team members were assessed at 2 levels: individual height, mass, age, and body-mass index (BMI) and the team performance scores and rankings. Fourteen Olympic teams with a total of 106 team members, including the alternates, were included. Trend analyses were conducted using linear and polynomial models. Results: Simple linear correlations indicated that since 1956, height, mass, age, BMI, and team Olympic rank have been declining. However, second-order polynomial curve fits indicated that in the last 4 Olympic Games the members of the US women’s gymnastics teams have been getting larger. Conclusion: Women Olympic gymnasts were getting smaller through approximately the 1980s and early 1990s. Since then the size of these gymnasts has increased. The minimum-age rule modifications may have played a role in athlete size changes along with a shift from the near dominance of the former communist Eastern Bloc.

Previous research has demonstrated the influential role of physical appearance-related feedback in the development of body image and eating disturbances. Teasing and negative feedback have been established as strong correlates and predictors of body dissatisfaction, maladaptive eating behaviors, and psychological distress. However, very little is known about ambiguous appearance-related feedback and its impact on others. The current study sought to explore this area with an experimental study to examine the effects of ambiguous appearance-related feedback on body image, mood states, and intentions to use body change strategies. Undergraduate women (N=146) were randomly assigned to an ambiguous appearance-related or ambiguous nonappearance-related feedback condition. Body image, mood states, and intentions to diet, exercise, and use unhealthy weight control methods were assessed before and after feedback was provided by a confederate. Results indicated no significant differences between feedback conditions in body image and mood states. The mean trends for all mood state, with the exception of anger, indicated better mood states after ambiguous appearance-related feedback compared to after ambiguous nonappearance-related feedback. State anger was greater in the ambiguous appearance-related feedback condition suggesting that this particular type of feedback was interpreted in a negative manner. Further, there was a significant difference between feedback conditions for intentions to diet and use bulimic behaviors, with lower levels in the ambiguous appearance-related feedback condition. No significant differences were found for intentions to exercise. State appearance comparison was not shown to mediate the relationship between ambiguous feedback and body image, mood states, or intentions to use body change strategies. Trait appearance satisfaction, appearance comparison, appearance schematicity, and thin ideal internalization were found to moderate the relationship between ambiguous feedback and state depression. Trait appearance comparison moderated the relationship between ambiguous feedback and intentions to use bulimic behaviors. Exploratory analyses conducted with subsamples developed using high versus low levels of trait disturbance showed significant results for the subsample based on trait appearance comparison levels. The findings are discussed in the context of possible reasons for the unexpected responses to the ambiguous appearance-related versus nonappearance-related feedback. The limitations of the study and directions for future research are also noted.

Business professionals have always been intrigued on how to increase purchases through advertisements. Digital advertisements are a new medium in which businesses can utilize to connect with consumers. In this study, participants (n = 126) were presented advertisements on a Qualtrics survey that manipulated color (warm and cool) and font size (large and small) across three product types (electronics, food, and automobiles) to examine the effects of Purchase Intention. There were no significant main effects or interactions of color and font size on Purchase Intention throughout each product type. However, color and font size impacted other factors (Perception, Memory, and Appeal) in the study and showcased significant findings in Electronic and Automobile advertisement product types. These results have implications for the effectiveness of advertising in digital mediums, the power of personally tailoring advertisements to individual consumers, and ultimately converting prospective window shoppers to paying customers.

Quantity surcharges have been widespread in the marketplace for decades. However, little is known about what kinds of consumers and under what conditions they are more likely to be impacted by this pricing practice. The current research contributes to the existing literature by investigating how a person’s childhood socioeconomic status affects their reaction toward quantity surcharges during adulthood. Across four studies, we find that childhood socioeconomic status has a positive impact on the purchase of a large and surcharged package size. However, when the economic conditions are threatening, the positive effect of childhood socioeconomic status disappears. The current research also provides a theoretical explanation for the interaction effect of childhood socioeconomic status and economic conditions. The focus on acquiring sufficient resources accounts for the interaction effect.

Cardiac output Increases by 30-50% during mammal Ian pregnancy. This Increase Is reflected by elevation In both heart rate and stroke volume. The primary mechanism of Increased stroke volume appears to be cardiac enlargement, rather than increased preload, afterload, or contractility. Animal studies have shown that enlargement of the heart occurs prior to an Increase In uterine blood flow during pregnancy and this type of enlargement can be mimicked by sex steroid administration. Systemic vascular resistance greatly decreases during pregnancy and with sex steroid administration. It has been postulated that systemic vascular resistance may be a signal for heart size changes. This study attempted to chronically decrease systemic vascular resistance by administration of an arterial vasodllator (hydralazlne) over a three week period to guinea pigs. At the time of study hemodynamlcs were measured which Included, heart rate, arterial pressure, right atrial pressure and cardiac output. In vitro left ventricular pressure volume relationships were also evaluated, as was total plasma volume.

In recent years, economic, social, and environmental factors have encouraged higher forage diets to be fed to dairy cows. Consequently, a better understanding of both the chemical and physical properties of dietary forage fiber is needed. Undigested neutral detergent fiber after 240 hours of fermentation (uNDF240) is the fiber residue remaining after 240 hours of in vitro fermentation and has only recently been defined. Physically effective neutral detergent fiber (peNDF) was defined about two decades ago and is the fraction of dietary fiber with a particle size (i.e., ≥1.18-mm screen) that stimulates chewing behavior, forms the rumen digesta mat, and is resistant to passage from the rumen. To-date, the relationship between these two dietary fiber measurements has not been evaluated. The overall goal of this thesis research was to quantitate the relationship between dietary uNDF240 and peNDF on feed intake, lactational performance, chewing behavior, and the ruminal environment of lactating Holstein dairy cows. The focal study (Chapter 2) investigated the effects of dietary uNDF240 (low or high) and peNDF (low or high) on lactating dairy cows. The four treatments were: 1) low uNDF240, low peNDF (8.8%, 20.1%; LULP; 2) low uNDF240, high peNDF (8.9%, 21.8%; LUHP); 3) high uNDF240, low peNDF (11.4%, 18.6%; HULP); and 4) high uNDF240, high peNDF (11.6%, 22.0%; HUHP). Additionally, a new descriptive term, physically effective uNDF240 (peuNDF240) was calculated as the product of the dietary physical effectiveness factor (pef; % of particles retained on ≥1.18-mm screen with dry sieving) and uNDF240 as a percentage of dry matter (DM). This new descriptive term aimed to integrate the effects of dietary particle size and NDF (in)digestibility. The dietary peuNDF240 concentrations were 5.4% (LULP), 5.8% (LUHP), 5.9% (HULP), and 7.1% (HUHP). The LULP treatment resulted in greater dry matter intake (DMI) and energy corrected milk (ECM), as well as more favorable chewing behavior (i.e., no effect on rumination but less time spent eating) in comparison to the HUHP diet. When comparing the same two treatments, total volatile fatty acid concentration was greater, mean ruminal pH was lower, and NDF turnover rate tended to be greater for the LULP treatment. Milk fat percentage was influenced by dietary uNDF240 with the high uNDF240 diets having an elevated percentage. The LUHP and HULP treatments often did not differ in animal response variables, such as DMI, ECM, mean ruminal pH, and chewing behavior, reflecting their similar dietary peuNDF240 concentration. Importantly, by reducing peNDF of the high uNDF240 treatments, DMI increased to an amount similar to the low uNDF240 treatments. Animal responses were consistently different between the LULP and HUHP treatments as expected: the low uNDF240 diet, chopped more finely, encouraged greater DMI than the high uNDF240 diet chopped coarsely. However, the LUHP and HULP diets with similar peuNDF240 often resulted in similar cow responses, even though the peuNDF240 was obtained differently for each diet. With these diets fed to high-producing cows, it appears that the integration of particle size and indigestibility of fiber using a peuNDF240 measurement is highly related to DMI, ECM yield, chewing behavior, and ruminal environment. In the future, this relationship may prove useful in predicting DMI of lactating dairy cows fed a range of diets differing in uNDF240 and particle size.

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Les petites sociétés génèreraient de meilleures performances en périodes économiquement favorables et leurs performances seraient plutôt médiocres en périodes économiquement défavorables. Nous avançons l‟hypothèse selon laquelle l‟effet taille n‟est manifeste que durant les périodes d'expansion économique. Notre étude empirique confirme cette hypothèse pour la période 2000-2009. Nous utilisons un modèle avec variables binaires pour estimer les alphas ainsi que trois indicateurs du cycle économique : l'indicateur composite avancé de l‟OCDE, l‟indice CAC 40 et l‟Euribor 1 mois. / It would seem that small companies perform better in economically favourable times and give more mediocre performances in economically unfavourable times. We put forward the hypothesis that size effect only occurs during periods of economic expansion. Our empirical study confirms this hypothesis for the 2000-2009 period. We use a model with binary variables to estimate alphas as well as three economic cycle indicators: the OCDE composite leading indicator, the CAC 40 index and the 1 month Euribor rate.

Districts are intermediary legislative institutions that structure the relationship between constituents and legislatures. Situated between citizens and their elected representatives, districts mediate citizen-legislator interaction, and may have wide-reaching effects on the representational relationship. By creating a political community, defining its interests by delineating its scale and boundaries, and structuring interaction between constituents and their elected representatives, districts shape the representational relationship. District characteristics alter the representational experience for constituents with very real consequences for trust in government, evaluations of legislative institutions and representatives, perceptions of responsiveness, and the degree and type of constituent-legislator communication. Three district characteristics are examined: the population size of legislative districts (constituency size), the shape of district boundaries (geographical compactness, and the extent to which district boundaries follow pre-existing political subdivision boundaries (boundary coterminousness). Using Census data and GIS, measures of these characteristics are created for every state legislative and congressional district (post-2000 redistricting) in the United States. These characteristics are combined with public opinion data to test for their influence on attitudes toward government, legislative institutions, and legislators, as well as the closeness of the representational relationship. The findings suggest constituency size is an important determinant of evaluations of government, institutions, and legislators at both the state and congressional level. The geographical districting principles of compactness and coterminousness influence the amount of constituent-legislator communication, knowledge of representatives, and in-person contact with representatives, primarily at the congressional district level. For decades, legislative districts have been drawn as if they matter only for the electoral success of legislative candidates and the partisan and racial groups those candidates represent. The primary contribution of this work is to show that districts matter beyond defining the dominant partisan or racial attributes of district constituents. Districts influence how representation is experienced by constituents.