Thesis (Ph.D.) - University of Queensland, 2006. / Includes bibliography.

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abstract: The bony pelvis is a pivotal component of the locomotor system, as it links the hindlimb with the trunk and serves as anchorage for the primary propulsive musculature. Its shape is therefore expected to be adapted to the biomechanical demands of habitual locomotor behavior. However, because the relationship between locomotor mechanics and pelvic morphology is not well understood, the adaptive significance of particular pelvic traits and overall pelvic shape remains unclear. This study used an integrative, dual approach to elucidate the relationship between form and function in the primate pelvis. A biomechanical cylinder model of pelvic stress resistance was tested using in vitro strain analysis of monkey and ape cadaver specimens. These results were used to refine adaptive hypotheses relating pelvic form to locomotor mechanics. Hypotheses of adaptation were then tested via univariate and geometric morphometric methods using a taxonomically broad, comparative sample of 67 primate taxa. These results suggest that the pelvis exhibits some iliac and ischial adaptations to stress resistance that are associated with the biomechanical demands of habitual locomotor loading and of body size. The ilium and ischium exhibit relatively low levels of strain during experimental loading as well as adaptations that increase strength. The pubis exhibits relatively high strains during loading and does not vary as predicted with locomotion. This integrated study clarifies the relationship between strain and adaptation; these results support the hypothesis that bones adapted to stress resistance exhibit low strains during typical loading. In general, the cylinder model of pelvic biomechanics is unsupported. While the predictions of loading regimes were generally rejected, the inability of these methods to test the possible occurrence of overlapping loading regimes precludes outright rejection of the cylinder model. However, the lack of support for predicted global responses to applied loading regimes suggests that pelvic stress resistance may be better explained by a model that accounts for local, functional subunits of pelvic structure. The coalescence of a localized model of pelvic biomechanics and comparative morphometrics has great potential to shed light on the evolution of the complex, multi-functional structure of the pelvis. / Dissertation/Thesis / Ph.D. Anthropology 2010

The creation of anatomically correct three-dimensional joints for the simulation of humans is a complex process, a key difficulty being the correction of invalid joint configurations to the nearest valid alternative. Personalised models based on individual joint mobility are in demand in both animation and medicine [1]. Medical models need to be highly accurate animated models less so, however if either are to be used in a real time environment they must have a low temporal cost (high performance). This work briefly explores Support Vector Machine neural networks as joint configuration classifiers that group joint configurations into invalid and valid. A far more detailed investigation is carried out into the use of topologically evolved feed forward neural networks for the generation of appropriately proportioned corrective components which when applied to an invalid joint configuration result in a valid configuration and the same configuration if the original configuration was valid. Discontinuous vector fields were used to represent constraints of varying size, dimensionality and complexity. This culminated in the creation corrective quaternion constraints represented by discontinuous vector fields, learned by topologically evolved neural networks and trained via the resilient back propagation algorithm. Quaternion constraints are difficult to implement and although alternative methods exist [2-6] the method presented here is superior in many respects. This method of joint constraint forms the basis of the contribution to knowledge along with the discovery of relationships between the continuity and distribution of samples in quaternion space and neural network performance. The results of the experiments for constraints on the rotation of limb with regular boundaries show that 3.7 x lO'Vo of patterns resulted in errors greater than 2% of the maximum possible error while for irregular boundaries 0.032% of patterns resulted in errors greater than 7.5%.

abstract: ADHD is a childhood neurobehavioral disorder characterized by inordinate levels of hyperactivity, inattention and impulsivity. The inability to withhold a reinforced response, or response inhibition capacity (RIC), is one aspect of impulsivity associated with ADHD. The first goal of this dissertation was to evaluate the fixed minimum interval (FMI) schedule as a method for assessing RIC. Chapter 2 showed that latencies were substantially more sensitive than FMI-derived estimates of RIC to the effects of pre-feeding and changes in rate and magnitude of reinforcement. Chapter 3 examined the ability of the FMI to discriminate between spontaneously hypertensive rats (SHR), an animal model of ADHD, and Wistar Kyoto (WKY) controls. Results from Chapter 3 showed that RIC was not substantially different between SHR and WKY rats. However, latencies were significantly shorter for SHRs than for WKYs suggesting incentive motivation differed between strains. The second goal of this dissertation was to examine the sensitivity of the SHR to nicotine. ADHD is a risk factor for tobacco dependence. The goal of Chapters 4 and 5 was to determine whether the SHR provided a model of ADHD-related tobacco sensitivity. Chapter 4 examined nicotine's locomotor and rewarding effects in adolescent SHRs using the conditioned place preference (CPP) procedure. SHRs developed CPP to the highest nicotine dose tested and were sensitive to nicotine's locomotor-enhancing properties. WKY controls did not develop CPP to any nicotine dose tested and were not sensitive to nicotine's locomotor properties. However, it is likely that nicotine effects were obscured by a pseudo-conditioning to saline in WKYs. Chapter 5 demonstrated that SHRs were more active than WKYs in the open-field but not in the Rotorat apparatus. Results also showed that SHRs and WKYs were both sensitive to nicotine's locomotor sensitizing effects. However, WKYs were more sensitive than SHRs to nicotine's locomotor suppressing effects. Collectively, results from Chapters 4 and 5 show that SHRs are sensitive to the rewarding and locomotor-enhancing properties of nicotine. However, more research is necessary to confirm that SHRs are a suitable model for studying ADHD-related tobacco use. / Dissertation/Thesis / Doctoral Dissertation Psychology 2015

abstract: Many studies on human walking pattern assume that adult gait is characterized by bilateral symmetrical behavior. It is well understood that maintaining symmetry in walking patterns increases energetic eciency. We present a framework to provide a quantitative assessment of human walking patterns, especially assessments related to symmetric and asymmetric gait patterns purely based on glide reflection. A Gliding symmetry score is calculated from the data obtained from Motion Capture(MoCap) system. Six primary joints (Shoulder, Elbow, Palm, Hip, Knee, Foot) are considered for this study. Two dierent abnormalities were chosen and studied carefully. All the two gaits were mimicked in controlled environment. The framework proposed clearly showed that it could distinguish the abnormal gaits from the ordinary walking patterns. This framework can be widely used by the doctors and physical therapists for kinematics analysis, bio-mechanics, motion capture research, sports medicine and physical therapy, including human gait analysis and injury rehabilitation. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2017

Made available in DSpace on 2014-06-11T19:22:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-03Bitstream added on 2014-06-13T19:49:08Z : No. of bitstreams: 1 bortolaia_ap_me_rcla.pdf: 1695131 bytes, checksum: 3b8502e6f7817be294f35326f50bbdfe (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / O objetivo deste estudo foi examinar a organização das passadas do andar, em bebês com diferentes experiências no andar, durante a ultrapassagem de um obstáculo. Trinta bebês foram distribuídos de acordo com o tempo de aquisição do andar independente em 3 grupos: 1, 3 e 6 meses de experiência no andar. A tarefa consistiu em caminhar sobre uma passarela em 2 condições experimentais: sem e com um obstáculo de espuma com 2 cm de altura e 3 cm de largura. Marcas foram afixadas nos centros articulares dos membros inferiores dos bebês e o andar foi filmado no plano sagital para ambos os lados, simultaneamente. Três ciclos para o andar normal, três para a perna de abordagem e três para a perna de suporte foram digitalizados utilizando o sistema APAS. Com base nas informações espaciais e temporais, comprimento, duração, cadência, velocidade, duração das fases de suporte e de balanço e fase relativa entre os membros foram calculadas. Ainda, as distâncias horizontal e vertical entre pé e obstáculo foram calculadas para as pernas de abordagem e de suporte. Os resultados indicaram que os bebês do grupo 1 mostraram passadas mais curtas e mais lentas do que os bebês dos grupos 2 e 3. Ainda, bebês do grupo 1 mostraram fase de suporte maior do que bebês do grupo 2. Quando os bebês tiveram que ultrapassar o obstáculo, mostraram passadas mais curtas e mais lentas do que na situação sem obstáculo. Ainda, bebês dos grupos 2 e 3 apresentaram cadência menor durante a passada com obstáculo e fase de suporte e fase de suporte simples menores no momento da ultrapassagem e fase de segundo duplo suporte maior após a ultrapassagem do obstáculo para a perna de abordagem. Também diminuíram a porcentagem da fase relativa referente a coordenação intermembros para a perna de abordagem e mostraram pequenas alterações no padrão coordenativo... / The purpose of this study was to examine the step walking organization during obstacle avoidance in infants with different walking experience. Thirty infants were distributed into trree groups according with their independent walking experience: one, three and six months of walking experience. The task consisted of walking in a runway in two experimental conditions: without and with a foam obstacle with 2 cm high and 3 cm wide. Markers were placed on the joint centers in both infants' lower extremity and walking performances were videotaped in the sagittal plane for both sides, simultaneously. Three cycles for normal walking, three for supportive leg and three for approaching leg were digitized using the APAS system. Based on the espacial and temporal information, stride length, duration, cadence, velocity, duration of support and swing phases and relative phase between limb were calculated. The horizontal and vertical distances between foot and obstacle were also calculated for both supportive and approaching legs. The results indicated that the infants of group 1 walked with shorter stride length and slower velocity than the infants of group 2 and 3.The first group showed support phase greater than the second group. When infants had to step over the obstacle, they walked with shorter stride and slower velocity than when they did not have to step over the obstacle. Furthermore, the infants from group 2 and 3 showed lower cadence than infants from group 1 when stepping over the obstacle and smaller support and single support phases during stepping over the obstacle and second double support phase greater after stepping over the obstacle for the approaching leg. Also, the phase relative percentage regarding interlimb coordination for approaching limb was smaller and few variations in coordination pattern between the shank and thigh segments for approaching... (Complete abstract, click electronic address below)

Orientador: Fausto Berzin / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-07-21T05:55:24Z (GMT). No. of bitstreams: 1 Zuccolotto_DeborahGatti_M.pdf: 1779011 bytes, checksum: 8c0c5c2a35b2c7c203d0461c594ec465 (MD5) Previous issue date: 1996 / Resumo: A proposta deste trabalho foi observar o comportamento eletromiográfico dos músculos Vasto Medial Oblíquo, Vasto Lateral, Semitendíneo e Bíceps da Coxa (porção longa) durante atividade no aparelho "STEPPING MACHINE", tomando-se as medidas de ângulo 0°, 30°, 60°, 90° para a flexão e extensão da perna na articulação do joelho. Foram analisados 10 voluntários adultos normais, utilizando-se um eletromiógrafo de 8 canais, mini-eletrodos de superfície do tipo BECKMAN e um eletrogoniômetro. O método estatístico empregado foi a análise de variância (ANOVA) e o teste de Tukey. Os resultados mostraram que no movimento de flexão, o músculo Vasto Medial Oblíquo apresentou diferença dos potenciais médios de ação ao nível de 5% de significância para as medidas de ângulo 90°, 30° e 0° e também diferença sifnificante entre 60° e 0°. O músculo Vasto Lateral apresentou diferença significante também em 5% no ângulo 90° em relação °a 60°, 30° e 0°, além de diferença entre 60° e 0°. Os músculos semitendíneo e bíceps da coxa não apresentaram diferença significativa nas diferentes medidas de ângulo. Durante o movimento de extensão do joelho, os músculos Vasto Medial Oblíquo e Vasto Lateral, apresentaram diferença entre as medidas de ângulo 90° e 60° em relação às medidas 30° e 0°. Os músculos semitendíneo e bíceps da coxa, não apresentaram diferença significante entre os potenciais de ação nas várias angulações analisadas. Os resultados sugerem que o aparelho "STEPPING MACHINE" pode ser indicado na reabilitação pós-operatória da articulação do joelho / Abstract: The purpose of this paper was to observe the electromyographyc behaviors of the Vastus Medialis, Vastus Lateralis, Semitendineous and Biceps Femoris Muscles during activity in the Stepping Machine equipament, taking the angle measurement 0°, 30°, 60° and 90° for the leg flexion and extension in the knee joint. Ten normal adults volunteers were analysed by using a 8 channels electromyographer, mini surface electrode Beckman type and electrogoniometer. The statistics method utilized was the variance analysis (ANOVA) and the Tukey test. The results showed that in the joint movement Vastus Medialis Muscle presented difference of the medius potencials of action in 5% level of significance for the angle 90° measurement, 30° and 0° and significant difference among 60° and 0°. The Vastus Lateralis muscle presented significant difference also in the angle 90° in 5% in relation of 60°, 30° and 0°, beyond the difference among 60° and 0°. The semitendineous and biceps femoris muscles didn't present significant . difference in different measures of the angles. During the knee joint extension, the Vastus Medialis and Vastus Lateralis muscles presented difference among the 90° and 60° angles in relation to 30° and 60° measurement. The Semitendineous and Biceps Femoris didn't show difference significant among the potencials action in several angled analysed. The results suggest that the Stepping Machine can be indicate in the post-operation rehabilitation / Mestrado / Fisiologia e Biofisica do Sistema Estomatognatico / Mestre em Odontologia

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