Minorities are significantly overrepresented in America's prison population, and many studies have been conducted to determine possible causes for such a disparity. Few of these studies, however, have examined small stature as a potential contributor to criminal behavior. This study examines the relationship between criminal behavior and stature among American males. The heights, weights, stature scores (a function of the product of height and weight) and the body mass indices of criminals are examined as a whole, as well as by subgroup based on race, locality, and nature of the crime committed. The average weight of the male criminal population is substantially lower than that of the general male population. The center of the height distribution for urban criminals is found to be lower than men who commit crimes in suburban or rural areas, as is the center of the weight distribution for index criminals when compared to non-index criminals. Murderers demonstrate the smallest mean and median heights and weights when compared to the rest of the criminal population. Although small stature can be associated with certain crimes and localities, size cannot be associated with the racial disparity in today's prisons.

Incubation of avian eggs is an energy demanding process. Incubating parent faces a conflict between investment into optimal thermal conditions for developig embryos and meeting of own energy requirements. This applies especially in uniparental incubators such as ducks. During incubation, female utilizes energy from fat storage or actual food intake. The proportion of energy used from food than may reflect the time spent by female on the nest. The utilizing of these both sources ratio plays a role in time spent on nest. The aim of the thesis was to describe an incubation rhythm in females of Common Pochard (Aythya ferina) and relate them to climatic variables and changes in body mass. Data were collecetd for three years in the Poodříí Landscape Protected Area at free-living females. We placed a weighting mechanism under the nest with conected datalogger recording voltage variations, which offered me an information about female body mass and time and duration of recesses. Incubation rhytm of females was described by time spent on time ("incubation constancy"), recess frequency and recess duration. Females left the nest most grequently at night-time and during dawn and dusk. Probable explanation of this pattern is better food availability in the night-time and lower risk of nest predation by predators...

O estudo das estruturas osteológicas e da musculatura a estas relacionadas permite compreender, em animais extintos, a evolução dos traços associados aos seus hábitos locomotores, especialmente se este estudo considerar os seus representantes atuais, a fim de se estabelecer as relações de homologia e analogia entre as estruturas comparadas e suas respectivas funções inferidas. Além disso, em uma análise biomecânica de espécies fósseis, deve-se considerar, mesmo que de forma aproximada, a massa corporal como atributo fundamental. Prestosuchus chiniquensis é uma espécie extinta de arcossauro terrestre relacionada à linhagem dos crocodilos atuais. Para testar as hipóteses de hábitos locomotores deste táxon, foi feita a reconstrução muscular da coxa do espécime UFRGS-PV-0629-T, com base nas descrições musculares de aves e crocodilos. Observou-se que o conjunto muscular considerado em P. chiniquensis, de uma forma geral, é bastante semelhante ao dos representantes atuais. Dos dezesseis grupos musculares da coxa avaliados, treze foram reconhecidos como presentes e homólogos entre os dois grupos de arcossauros viventes comparados, de modo que a reconstrução destes músculos, no exemplar fóssil analisado, se mostrou a opção mais parcimoniosa, envolvendo o menor número de passos evolutivos. Por outro lado, a morfologia da cintura pélvica e dos membros posteriores confere uma disposição distinta dos locais de origem e inserção desta musculatura, com possível alteração das linhas de ação dos mesmos. Por fim, a comparação com formas arcossaurianas extintas e atuais mostrou uma condição basal mantida para a morfologia do fêmur e a flexão do joelho, enquanto a morfologia do púbis e do ísquio – e a origem da musculatura a eles associada – revelou um padrão derivado. Paralelamente, diversas metodologias para a estimativa da massa de formas extintas foram aplicadas e comparadas, com o intuito de realizar inferências biomecânicas para o hábito locomotor de P. chiniquensis. O espécime considerado, com 4,5 m de comprimento total, apresentou uma massa média estimada de 400 kg, a qual, em conjunto com a morfologia geral dos ossos dos membros posteriores, se mostrou compatível com um hábito locomotor subcursorial, além de uma postura preferencialmente mesógrada e quadrúpede. Contudo, devido ao caráter generalista inferido – permitindo uma ampla gama de posturas admissíveis – foi sugerida uma estratégia de caça por emboscada, na qual P. chiniquensis adotaria uma postura bípede e ortógrada, que poderia conferir à espécie vantagens, tal como uma maior velocidade em relação à postura usual. / Studying osteological structures and its associated musculature may help to understand the evolution of locomotor traits in extinct animals, especially if this study considers their extant relatives, in order to set up homologies and analogies between the compared structures and their inferred functions. Furthermore, in a biomechanical analysis of the fossil record one should consider the estimated body mass as a fundamental attribute. Prestosuchus chiniquensis is an extinct species of terrestrial archosaur related to extant crocodiles. To test different hypotheses related to the locomotion of this taxon, the muscular reconstruction of the thigh of the specimen UFRGS-PV-0629-T was realized, based on the muscular descriptions of extant birds and crocodiles. It was observed that the main muscular groups considered for the reconstruction of P. chiniquensis were similar in birds and crocodiles in a general manner. Among sixteen muscular groups of the thigh that were analyzed, thirteen were recognized as present and homolog to both extant groups of archosaurs, so that the reconstruction of those muscles in the analyzed fossil specimen showed to be the most parsimonious option, involving the least number of evolutionary steps. On the other hand, the morphological particularities of the pelvic girdle and the hindlimbs gave a distinct arrangement for the origin and insertion sites of this musculature, possibly changing their line of actions. Finally, the comparison between extinct and extant archosaurs showed a basal condition sustained in some aspects, such as the morphology of the femur and the flexion of the knee, though, other aspects were considered as derived, such as the morphology of the pubis and ischium, and their associated muscle origins. At the same time, different methodologies for estimating body mass of fossil specimens were applied, and compared in order to make biomechanical inferences of the locomotors habits of P. chiniquensis. The specimen considered, approximately 4.5 m long (15 ft), presented an estimated mass of 400 kg (around 880 lbs), which, with the general morphology of the hindlimbs, were consistent with a subcursorial locomotor habit, with a preferential “semi-improved” and quadruped posture. However, due to the generalist character inferred for P. chiniquensis – which permitted a wide range of feasible postures – an ambush hunting strategy, with a biped and totally improved posture, may be admitted, possibly conferring some advantages, such as higher speeds, if compared to usual postures.

Heightened reward associated with palatable food, a construct referred to as hedonic reward, can promote excessive energy intake among adults. However, no known studies have examined the influence of hedonic reward on adolescents' eating behavior and weight status. The present study examined whether there was an association between hedonic hunger and weight status in overweight/obese adolescents and whether dietary behavior (caloric consumption) mediated this association. Baseline measures of body mass index, hedonic food reward, and dietary intake were collected from one hundred overweight and obese adolescents. Data were analyzed using mixture modeling. Mediation at varying levels of hedonic hunger was explored and three heterogeneous sub-classes were identified. Results indicated that for 65% participants there was a positive association between hedonic hunger and zBMI such that one unit of increase in hedonic hunger was associated with a 0.35 unit increase in zBMI. However, no conclusive evidence of caloric intake mediating the association between hedonic hunger and weight-status was found. Overall, our results suggest that exaggerated hedonic responses are associated with higher body mass in adolescents. These results provide a compelling argument that hedonic hunger can potentially override the homeostatic need for energy and may be associated with weight-gain.

Obesity results from a complex interaction between diet, physical activity, and the environment. The purposes of this study were to identify behaviors associated with resilience to childhood obesity, and to compare the sensitivity of the Figure Rating Scales (FRS) in reflecting Body Mass Index (BMI). Fifty health professionals in nutrition and 35 low-income, parent-and-child pairs completed the study. Children aged 6-11, perceived as “normal-weight” by their parents, were recruited. Five children had a measured BMI above the 85th percentile. Using a picture-sort method, each participant responded to a series of questions about 13 childhood obesity-related messages. Results included comparison between health professionals, parents, and children about 1) familiarity toward each message, 2) frequency in following the recommendation, 3) perception of ease for others to follow, and 4) perception of effectiveness to help prevent childhood obesity. Health professionals and parents had similar familiarity regarding all 13 messages. However, in terms of practicality, health professionals and parents differed significantly in eight messages that they reported “always taught/followed,” seven messages that they “sometimes taught/followed,” and two messages that they “seldom or never taught/followed.” In most messages, children’s observation about what the family followed differed from what parents reported following. In terms of ease for others to follow “Watch portion sizes” and “Tell children to eat all of the meal before getting dessert,” health professionals and parental perception differed significantly. In terms of effectiveness in childhood obesity prevention, health professionals and parents agreed on 12 of 13 messages. Health professionals did not find message “Tell children to eat all of the meal before getting dessert” to be effective in preventing childhood obesity, whereas parents did. FRS and measured BMI were significantly correlated among health professionals (r=0.75), parents (r=0.72), and children (r=0.53 for children ages 8-11, r=0.64 when a mother selected a silhouette for her child). For different subgroups, parent-and-child silhouette selection was closely correlated (r= 0.84). However, correlation between child’s BMI percentile and silhouette was nonsignificant in most subgroups (r= 0.47). In conclusion, FRS was effective among adults and older children (aged ≥8) in reflecting BMI but not among younger children (aged 6-7).

In light of alarming rises in the prevalence of obesity worldwide, tackling the obesity ‘epidemic’ is now a national health priority in many countries. Increasingly, population measures that provide accurate estimates of body fatness in children are required. Body mass index (BMI), or weight standardised for height, remains the most cost-effective and practical tool in this regard. However, there is evidence that the association between BMI and body fatness is variable in children from different ethnic backgrounds. The primary aim of this thesis was to investigate the appropriateness of BMI thresholds for defining overweight and obesity in female children and adolescents from five diverse ethnic groups. Secondary objectives were to examine the associations between weight control practices and perceptions, and to compare objectively-measured physical activity levels with participation in active transport (AT). In order to achieve the primary aim stated above, it was necessary to obtain valid and reliable measures of body fat percentage (%BF) in a large sample of children. Bioelectrical impedance analysis (BIA) is well suited for this purpose, providing a portable and cost-effective means to estimate fat-free mass (and subsequently %BF). While equations exist for European, Maori, and Pacific Island children, findings from the preliminary study described in Chapter 2 demonstrate that there are no BIA equations appropriate for Chinese and Indian children. Given that these two groups are two of the fastest growing ethnicities in New Zealand, a new equation was developed that enables Asian girls to be included in future BIA research. The main study of this thesis involved a large-scale investigation of body composition in New Zealand’s five major ethnic groups (European, Maori, Pacific Island, East Asian, and South Asian). A total of 1,081 adolescent girls aged 11-16 years participated in the Girls’ Activity and Body Composition (ABC) Study. To extend the age range, data were combined with another study of 5-11-year-old New Zealand children (595 girls), coined the Body-Size and Steps in Children (BASIC) Study. Both studies measured BMI from height and weight, %BF from bio impedance measurements, and physical activity using sealed multiday memory pedometers over five consecutive days. A questionnaire was also administered to the adolescent-aged girls to gather data related to weight perceptions and practices. Initial analyses of the main dataset demonstrated that existing BMI definitions of overweight were relatively insensitive for predicting excess %BF in South and East Asian girls. Conversely, low specificity was observed for Pacific Island and Maori children. These findings provided the rationale for the second set of analyses: the development of BMI cut-off points that correspond to an equivalent level of %BF across all ethnicities. The adjusted BMI curves for overweight and obesity ranged from an average of 3.3 and 3.8 kg.m-2 (respectively) lower than international standards in South Asian girls to 1.5 and 1.9 kg.m-2 higher in Pacific Island girls. Clearly, the proposed changes will have significant effect on our estimates of overweight and obesity in this population group. Subsequent investigation revealed that many adolescent girls misclassify their weight status. However, the number of girls trying to lose weight exceeded those who perceived themselves as being overweight, with the magnitude of the difference dependent on ethnicity. It was concluded that interventions and educational campaigns that assist girls in recognising a state of excess body fat are a priority for all ethnic groups to ensure that behavioural changes necessary to combat widespread overweight and obesity are adopted. Finally, it was observed that the physical activity levels of the participants were significantly lower on weekends (9,528  4,407) than on weekdays (12,597  3,630). Furthermore, a consistent decline in daily step counts was observed with age: after adjustment for ethnicity and socioeconomic status (SES), girls in school years 9-10 achieved 2,469 (weekday) and 4,011 (weekend) fewer steps than girls in years 1-2. Daily step counts also varied by ethnicity, with Maori girls the most active and South Asian girls the least active. Overall, girls who used AT to and from school averaged 1,052 more weekday steps than those who did not use AT. These data suggest that adolescent-aged girls and girls of Asian descent are priority groups for future physical activity interventions, and that the promotion of AT in girls appears to be worthwhile.

Thesis (Ph. D.)--Case Western Reserve University, 2007. / [School of Medicine] Department of Epidemiology and Biostatistics. Includes bibliographical references. Available online via OhioLINK's ETD Center.

This thesis explores race and gender differences in perceptions and behaviors regarding weight and obesity, along with the relative influence of individual and structural factors on the personal weight status of black and white adults. In addition, this study examines the extent to which black and white adults differ in their perceptions of discrimination attributed to their personal weight. Based on an analysis of data from a national poll conducted by ABC News and TIME magazine, results indicate that weight status perceptions of overweight black females were consistent, while incongruity was found in perceived and actual weight status among obese black women. On the other hand, a greater proportion of obese white women under-assessed their weight status compared to obese black women. However, regardless of race, men were more likely to under-assess their weight than women. There were no differences by race and gender in reports of having felt discriminated against because of personal weight status. Findings also revealed that black females and males face greater constraints than their white counterparts related to controlling weight and fighting obesity, including such factors as a lack of information on how to establish good eating habits, the need to monitor food content, and being able to afford the cost of purchasing healthy food. A discussion of these findings in relation to previous research is provided along with recommendations for further study.

In Canada, the prevalence of childhood overweight and obesity has increased dramatically since the 1980s. Few studies have examined factors associated with overweight and obesity in Canadian children. The purpose of this study was to: (1) explore the relationship between physical activity and BMI, (2) examine the prevalence of childhood overweight and obesity, and (3) explore the importance of age, gender, and residency (farm versus town) in relation to childhood overweight and obesity in a sample of rural Saskatchewan children.<p>This cross-sectional study included a self-report questionnaire survey and anthropometric assessment of a sample of children (Grades 4-6) from rural Saskatchewan. Of the 525 questionnaires distributed, 262 were completed with a signed consent form (response rate: 49.9%) and 251 of those students had their height, weight, and sitting height measured. The research questionnaire gathered demographic data about the child and the parents or guardian, data on the childs sedentary leisure activities, and a 7 day physical activity history using the Physical Activity Questionnaire for Older Children (PAQ-C). Each childs body mass index was estimated using the measured height and weight and these estimates were compared to international standards for BMI to estimate the prevalence of childhood overweight (25.5%) and obesity (7.1%) within the study population. There were no statistically significant gender differences in the proportion of children who were overweight or obese. The factors found to consistently have a significant association with the prevalence of overweight and obesity were Aboriginal descent and mothers and fathers BMI category. The mean PAQ-C score was similar for boys (3.3, SD = 0.64) and girls (3.2, SD = 0.57) and did not differ significantly by BMI category. <p>This descriptive study provided information on the prevalence of physical activity, overweight, and obesity in a sample of rural Saskatchewan children and the relationship between physical activity and BMI in the sample. Findings of this study can be used by nurses, other health professionals, and education leaders to develop health promotion programs to promote a healthier lifestyle for children and their families.

Background: Currently, if traveling the posted speed limit, the typical commuter driver in the Toronto Metropolitan area will travel round trip upwards of 60 minutes a day to work (Heisz and LaRochelle-Cote, 2005). As urban congestion continues to rise, commuting distances and times will progressively increase, placing commuter drivers at increased risk of developing musculoskeletal disorders (Porter and Gyi, 2002; Walsh et al., 1989; Chen et al., 2005; Sakakibara et al., 2006). As urban areas continue to expand, it is believed that a greater percentage of our urban populations will be defined as overweight or obese (Puska et al., 2003). To date the influence of body mass on driver posture, pressure distribution and discomfort during a prolonged driving situation has been left relatively untested. The purpose of this investigation is to determine the influence body mass has on driver posture, pressure distribution and discomfort during a prolonged driving situation. Methodology: Twelve male and 12 female participants, between 167 and 172 cm in stature were used in this investigation. Even numbers of males were assigned to either a light (51.3-57.7 kg), moderate (63.7-69.4 kg), or heavy (82.7-92.0 kg) body mass group. Participants were than placed in a 2 hour in lab driving simulation. During the simulation, lumbar flexion, pelvic angle, joint/segment angles, pressure distribution and discomfort were recorded. A three way mixed general linear model was used to determine if significant (α = 0.05) differences in discomfort, posture and/or interface pressure measurements existed over time. Results: Heavy drivers displayed increased total IT pressures and total seat pan/back pressures during driving. When normalizing these total pressures to area, differences in total IT pressure recorded from the seat pan, and total pressure recorded from the seat back were not significantly different (α = 0.05) across body mass groups. Due to the lack of seat pan accommodation with respect to surface area, the heavy body mass group’s total pressures per unit area for the seat pan was elevated relative to the lighter body mass groups. No differences in two-dimensional joint or segment kinematics and ratings of perceived discomfort were observed between body mass groups or between genders. Gender specific lumbo-pelvic postures and pressure distribution profiles were observed. Conclusion: With appropriate design of the seat pan to accommodate heavy body mass populations with respect to seat pan area, the influence of body mass as a potential risk factor in the development of discomfort would be reduced. With stature and body mass controlled between gender groups, biomechanical differences in both pressure distribution and lumbo-sacral postures were observed between males and females, verifying gender as a risk factor in the development of discomfort during prolonged driving. Recommendations to car seat manufacturers to recognize gender and body mass as important variables in the design of a car seat should be made.