Influência do alongamento prévio no pico de torque e na taxa de força em exercício de contração isométrica

The objective of this study was to investigate the influence of previous active static stretch on the isometric peak torque (PT) and rate of force development (RFD) measured from different time intervals from the beginning of muscle contraction. Participated of this study 15 male individuals, apparently healthy, with ages between 18 and 25 years, without regular physical activity practice. The individuals were submitted in different days to the following tests: 1) Familiarization session to the isokinetic dynamometer; 2) Two maximal isometric concentric contractions for knee extensors in isokinetic dynamometer to determine PT and RFD (Control), and; 3) Two active static stretching exercises for the dominant leg extensors (10 x 30 s for each exercise, with 20 s of rest). After the stretching, the isokinetic test was repeated (Post-Stretching). The conditions 2 and 3 were performed in random order. The RFD was considered as the mean slope of the moment-time curve at time intervals of 0-30, 0-50 and 0-100ms relative to the beginning of muscle contraction. It was verified significant reduction for both maximal RFD and PT after the stretching (p < 0.05). At intervals of 0- 30ms, 0-50ms and 0-100ms, the RFD at the conditions with stretching was similar to the RFD without stretching (p > 0.05). At intervals of 0-150ms and 0-200ms, the RFD obtained at the contraction without stretching was significantly higher that that obtained at the contraction with stretching (p < 0.05). It can be concluded that the static stretching, performed with duration of 600 s diminish isometric PT, maximal RFD and RFD measured at late phase (> 100 ms) of muscle contraction.

Entre o desaparecimento da infância e o alongamento da adolescência: concepções sobre as fases da vida na comunidade escolar e suas implicações no cotidiano escolar

O objetivo geral deste trabalho foi o de investigar os sentidos e concepções sobre a infância e a adolescência na sociedade atual e suas implicações no âmbito escolar. Buscamos entender os porquês que esse processo vem ocorrendo tendo como pressuposto sua associação com os modos de tutela e a consequente autonomia e independência precoce que crianças e adolescentes parecem estar adquirindo na sociedade atual. Ao examinar as concepções de infância e adolescência de crianças e adolescentes, buscamos investigar os limites e a autonomia das crianças e dos adolescentes, caracterizando os modos de tutela que os pais empregam na relação com seus filhos e analisar as implicações destas concepções no âmbito escolar

A influência do alongamento prévio no pico de torque e na taxa de desenvolvimento de força

The objective of this study was to investigate the influence of previous active static stretch on the peak torque (PT) and rate of force development (TDF) during isokinetic concentric contractions at 60 and 180.s-1 in active individuals. Twelve active subjects with ages between 18 and 30 years participated of this study. The individuals were submitted in different days to the following tests: 1) Familiarization session to the isokinetic dynamometer; 2) Five maximal isokinetic concentric contractions for knee extensors at each angular velocity (60 and 180.s-1) to determine PT and TDF (Control), and; 3) Two active static stretching exercises for the dominant leg extensors (10 x 30 s for each exercise, with 20 s of rest). After the stretching, the isokinetic test was repeated (Post-Stretching). The conditions 2 and 3 were performed in random order. There was no significant modification after the stretch exercises on the PT, angle and time at which the PT was attained, at 60 and 180º.s-1. In the same way, there was no significant modification on the TDF and angle at which the maximal TDF was attained in both angular speeds. In other way, the time to attain maximal TDF (TTDF) at 180º.s-1 was significantly lower after the stretching (Pre - 98.3 ± 27.5 ms and Post - 86.6 ± 30.2 ms). There was significant modification on the torque (60 and 180º.s-1) and time (60º.s-1) at different delta of angle variations, obtained at 60º.s-1 at Control and Post-Stretching conditions. However, there was significant reduction of time after the stretching exercises on delta of angle variations of 90-88º (Pre - 46.6 ± 6.5 ms and Post - 44.1 ± 5.1 ms), 88-85º (Pre - 65.8 ± 7.9 ms and Post - 63.3 ± 4.9 ms) and 85-80º (Pre - 93.3 ± 7.7 ms and Post - 90.0 ± 4.2 ms) at 180º.s-1. With base on these data, it is possible to conclude that PT and TDF do not modify after static stretching, irrespectively on the speed...(Complete abstract click electronic access below)

Interação genótipo x ambiente para produção de grãos e podridões de colmo em milho

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Degradabilidade ruminal da matéria seca de folhas e colmo de genótipos de Cynodon spp. em quatro idades de rebrota

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Características morfogênicas e estruturais da Brachiaria brizantha cv. Marandu submetida a diferentes doses de nitrogênio e alturas de resíduos

The objective of this study was to evaluate the rate of leaf appearance, leaf elongation rate, number of green leaves, length of blade and stem of Brachiaria brizantha cv. Marandu under different nitrogen levels and two residue heights. A randomized block design was used in a 4 x 2 factorial scheme, four doses of nitrogen (100, 200, 300 and 400 kg N ha(-1) year(-1)) and two residue heights (5 and 15 cm). There was significant interaction between residue height and nitrogen levels for leaf appearance rate of signal grass, which was influenced negatively and linearly by the residue heights being observed an average reduction of 28.20% from lower to higher residue. There was no interaction between the levels of nitrogen x residue height on the number of green leaves. The dosage that provided the highest stalk in the residue height of 5 cm was of 271.5 kg N ha(-1). An increase of 0.0745 cm tiller(-1) day(-1) for 1 kg of N ha(-1) applied to height of 15 cm of residue was observed. Nitrogen fertilization contributes positively to growth and development of rates of appearance and leaf extension. The management of pasture of Brachiaria brizantha cv. Marandu with 5 cm of residue and fertilization with 100 kg N ha(-1) provided better answer morphogenic traits.

Efeito agudo do alongamento de diferentes grupos musculares no desempenho muscular de idosas

Among the numerous possibilities of physical exercise, it has been recommended that stretching routines should be incorporated into training programs focused on the elderly population, and that these routines should be preferentially performed on the same strength or aerobic training session. However, studies have shown that muscle strength production can be acutely impaired if it is preceded by static stretching exercises (AE). Although there seems to be a relationship between the number of stretched muscles and strength response, no studies were found examining such relationship in the same study, simultaneously. Thus, the objective of this study is to analyze the acute effect of stretching of different muscle groups on strength performance in older women. Nineteen physically active older women participated in the study (67.8 ± 5.3 years, 68.9 ± 12.4 kg, 157.2 ± 6.4 cm)-usar ponto final em inglês e não vírgula. The participants visited the lab for six consecutive days, three of which were intended to familiarization. Over the next three days, all the participants performed the experimental conditions: control; quadriceps stretching alone and complete stretching, involving the major extensors muscle groups of knees and hips. Both the two stretching conditions were realized with three series of 30s (total volume of 90 seconds for each exercise). All experimental conditions was be performed with an interval of at least 24 hours and order of execution was be randomized. The force transducer was connected to a leg press apparatus, where the isometric force time curve and electromyographic activity of the vastus medial and vastus lateralis were recorded. Measurements were registered immediately after each experimental condition, during five seconds. Statistical analysis comprised descriptive procedures and the One way ANOVA test for repeated measures (p<0.05). No statistically significant differences between the control and the two...

Desenvolvimento do capim-marandu com altura fixa ou variável durante as estações do ano

Aimed to identify, for assessing the tillering dynamics and morphogenesis , strategy (s ) suitable ( s) defoliation management to optimize the appearance of tillers and biomass of Urochloa Brizantha syn. Brachiaria brizantha cv. Marandu ( marandugrass ) throughout the year. The experiment was conducted from January 2013 to May 2014 were studied three strategies defoliation: Marandugrass with 30 cm throughout the experimental period (constant height); Marandugrass 15 cm in winter, the spring 30 cm and 45 cm in summer (increasing height); and Marandugrass 45 cm in winter, the spring 30 cm and 15 cm in summer (descending height). The experimental design was completely randomized in a split plot in time, with four replications. In winter, in the spring and summer, the following variables were calculated: appearance rate (TApP), mortality (TMoP) and survival (TSoP) of tillers, balance (BAL) between TApP and TMoP, stability index (IE) numbers of tillers and leaf elongation rates and stem, length of leaf blade and stem, leaf senescence rate, phyllochron and duration of life of the sheet. The TAPP was higher in the early spring and summer. For TMoP, the highest values were in the late spring and summer. The balance between TApP and TMoP was negative in winter and late spring, regardless of defoliation strategy. There was no difference in IE between the heights of the canopy during winter and late spring .. The number of tillers was higher in early spring and summer and lower in winter and late spring. The defoliation strategies have not changed phyllochron, leaf elongation rate. In spring and summer, there were increases in the rates of appearance, elongation and leaf senescence and, furthermore, decreased life span and phyllochron sheet. The plant height with increasing showed a lower rate of senescence and lower culm length in the spring. To increase the number of tillers marandu, it is advantageous to handle the plant with increasing height, ie, 15 cm in autumn and winter, the spring 30 cm and 45 cm in summer.The maintaining of B. brizantha cv. Marandu with fixed height of 30 cm or with variations between 15 and 45cm from the fall/winter to summer, does not influence the appearance and the growth of leaves per tiller, which indicates great flexibility on management defoliation in this forage plant.

Técnicas de alongamento coronário

Introdução: O alongamento coronário é um procedimento que pode envolver, ou não, técnicas cirúrgicas, e que tem como principal objetivo aumentar o tamanho da coroa clínica, assim como devolver a estética, a forma e a função às arcadas dentárias. Este procedimento realiza-se, ou por motivos estéticos ou motivos restauradores. Ultimamente, os motivos estéticos têm vindo a ganhar importância e são eles que, muitas da vezes, levam os pacientes às consultas de medicina dentária. O sorriso gengival é um desses motivos, e pode ser causado, entre outras razões por, uma erupção passiva alterada ou/e um excesso vertical maxilar. Estas são as etiologias que serão descritas neste trabalho. O aumento coronário realiza-se, também, quando há a necessidade de reabilitar um dente, quer seja com resinas compostas ou com coroas. Este, deve sempre respeitar os limites biológicos do periodonto, nomeadamente o espaço biológico. A invasão deste espaço pode por em risco a manutenção da saúde do periodonto e a viabilidade do tratamento a longo prazo, por isto, preconiza-se que deve ser deixado um espaço de 3mm, desde a crista óssea até a margem restauradora. As técnicas de alongamento coronário enumeradas e definidas ao longo desta tese são: a gengivectomia, o retalho apicalmente posicionado e a erupção dentária forçada. Cada uma delas possui as suas indicações e contra-inidcaçoes. A gengivectomia é realizada quando não há necessidade de recontorno ósseo, pelo contrário, quando essa necessidade existe opta-se pelo retalho apicalmente posicionado. A erupção forçada é uma alternativa ao alongamento cirúrgico e aplica-se, normalmente a dentes não restauráveis mas com estrutura dentária sã abaixo do da crista óssea. Um ótimo diagnóstico é o essencial para a escolha da técnica de aumento coronário que melhor se adequa a cada caso. Objetivo: O objetivo desta revisão bibliográfica tem por base a pesquisa das técnicas de alongamento coronário, começando por perceber a anatomia do periodonto, as alterações que nele acontecem antes e depois dos procedimentos de alongamento coronário, a descrição e a comparação dos mesmos. Materiais e métodos: Para a realização desta revisão foram utilizados os principais motores de busca de dados científicos como a PubMed, B-on, Medline, Scielo, Google Académico e ainda o repositório on-line da Universidade Fernando Pessoa. Foram utilizadas as seguintes palavras chaves: “altered passive eruption”, “gingivectomy”, “gingivoplasty”, “apically repositioned flap”, “surgical crown lengthening”, “biologic width”, “mucogengival junction”, “forced eruption”, “prostethic dentistry”, “gummy smile”, resultando num pesquisa de 45 artigos e duas obras literarátias de interesse. Conclusões: Foi possível concluir que existem varias técnicas de alongamento coronário, cada uma adequada a cada caso e verificou-se que existem vários motivos pelo qual se realiza essa técnica.

MULTIPLICAÇÃO E ALONGAMENTO IN VITRO DE CLONES HÍBRIDOS DE Eucalyptus globulus

Os híbridos de Eucalyptus globulus representam uma excelente alternativa para o setor de celulose e papel, em razão dos ganhos em qualidade da madeira para a fabricação de celulose. Entretanto, estes híbridos têm apresentado recalcitrância ao enraizamento adventício. Assim, a micropropagação é apontada como a técnica para o rejuvenescimento desses híbridos adultos, viabilizando a propagação clonal dos mesmos. O presente trabalho avaliou o cultivo in vitro de três clones de Eucalyptus grandis x Eucalyptus globulus e de três clones de Eucalyptus urophylla x Eucalyptus globulus, em relação à multiplicação in vitro, no meio MS suplementado com 0,5 mg L-1 de BAP e 0,01 mg L-1 de ANA, bem como o efeito das concentrações de 0,25; 0,50; 0,75 e 1,0 mg L-1 de AIB e dos meios de cultura MS e JADS no alongamento in vitro das brotações. Os clones diferiram quanto à multiplicação in vitro das brotações e apresentaram uma taxa de multiplicação média dos clones de 3,0 tufos de brotações em cada subcultivo, ao longo dos 25 subcultivos realizados. No alongamento in vitro, os clones diferiram quanto às concentrações de AIB adequadas para provocar o alongamento, bem como em relação aos meios de cultura MS e JADS. O intervalo médio entre 0,40 e 0,80 mg L-1 de AIB proporcionou o maior número e comprimento das brotações alongadas in vitro e com maior vigor.

Efeito de diferentes tempos de alongamento na flexibilidade da musculatura posterior da coxa

Projeto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Fisioterapia

Avaliação da resistência cruzada de genótipos de milho à podridão do colmo e a acumulação de fumonisinas totais nos grãos.

2016

Phaeocytostroma ambiguum: novo patógeno associado à podridão do colmo de milho no Brasil.

2016