Navegando por Autor "SILVA FILHO, Manoel da"

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Changes in muscle strength in elderly women after proprioceptive neuromuscular facilitation based training
(Universidade Federal do Pará, 2015-06) SILVA, Edivã Bernardo da; PIN, Alessandro dos Santos; SILVA FILHO, Manoel da
Introduction: Proprioceptive neuromuscular facilitation (PNF) can be used to improve the quality of life of both healthy and diseased subjects, including the elderly, who suffer muscular weakness due to aging, leading to an impairment in functional capacity. Objective: Verify the effectiveness of PNF as a tool for functional conditioning. Materials and methods: We evaluated a total of ten elderly women aged 60–70 years, clinically healthy and physically active. They had the force of motion of hip flexion with knee extension analyzed by an analog dynamometer. They were then randomly and equally divided into experimental (EG) and control group (CG). The GC was instructed to continue with their normal activities while the GE held 15 training sessions in the lower limb (LL) based on the diagonal D1 and D2. Finally, a new collection wrench the two groups was performed and the data compared. Results: There was a significant increase in the average strength of GE, on the order of 31% (p < 0.01). The GC also had increased strength, but not significant (p > 0.05). Discussion: The results confirm that the FNP through initial work of readjustment and proprioceptive neuromuscular activation, and after that, conditioning of the muscle fibers (mainly resistive) is capable of amplifying the force developed by the muscle. Conclusion: The PNF was effective as training to gain muscle strength, should be better analyzed as a tool fitness, not to cause health risks, have low cost and easy application.
Acesso aberto (Open Access)
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways
(2013-12) SOUZA, Givago da Silva; GOMES, Bruno Duarte; LACERDA, Eliza Maria da Costa Brito; SAITO, Cézar Akiyoshi; SILVA FILHO, Manoel da; SILVEIRA, Luiz Carlos de Lima
The purpose of this study was to compare contrast sensitivity estimated from transient visual evoked potentials (VEPs) elicited by achromatic pattern-reversal and pattern-onset/offset modes. The stimuli were 2-cpd, achromatic horizontal gratings presented either as a 1 Hz pattern reversal or a 300 ms onset/700 ms offset stimulus. Contrast thresholds were estimated by linear regression to amplitudes of VEP components vs. the logarithm of the stimulus contrasts, and these regressions were extrapolated to the zero amplitude level. Contrast sensitivity was defined as the inverse of contrast threshold. For pattern reversal, the relation between the P100 amplitude and log of the stimulus contrast was best described by two separate linear regressions. For the N135 component, a single straight line was sufficient. In the case of pattern onset/offset for both the C1 and C2 components, single straight lines described their amplitude vs. log contrast relations in the medium-to-low contrast range. Some saturation was observed for C2 components. The contrast sensitivity estimated from the low-contrast limb of the P100, from the N135, and from the C2 were all similar but higher than those obtained from the high-contrast limb of the P100 and C1 data, which were also similar to each other. With 2 cpd stimuli, a mechanism possibly driven by the M pathway appeared to contribute to the P100 component at medium-to-low contrasts and to the N135 and C2 components at all contrast levels, whereas another mechanism, possibly driven by the P and M pathways, appeared to contribute to the P100 component at high contrast and C1 component at all contrast levels.
Acesso aberto (Open Access)
Dendritic thickness: a morphometric parameter to classify mouse retinal ganglion cells
(2007-10) LOOPUIJT, L.D.; SILVA FILHO, Manoel da; HIRT, B.; VONTHEIN, R.; KREMERS, Joannes Jozef Marie
To study the dendritic morphology of retinal ganglion cells in wild-type mice we intracellularly injected these cells with Lucifer yellow in an in vitro preparation of the retina. Subsequently, quantified values of dendritic thickness, number of branching points and level of stratification of 73 Lucifer yellow-filled ganglion cells were analyzed by statistical methods, resulting in a classification into 9 groups. The variables dendritic thickness, number of branching points per cell and level of stratification were independent of each other. Number of branching points and level of stratification were independent of eccentricity, whereas dendritic thickness was positively dependent (r = 0.37) on it. The frequency distribution of dendritic thickness tended to be multimodal, indicating the presence of at least two cell populations composed of neurons with dendritic diameters either smaller or larger than 1.8 µm ("thin" or "thick" dendrites, respectively). Three cells (4.5%) were bistratified, having thick dendrites, and the others (95.5%) were monostratified. Using k-means cluster analysis, monostratified cells with either thin or thick dendrites were further subdivided according to level of stratification and number of branching points: cells with thin dendrites were divided into 2 groups with outer stratification (0-40%) and 2 groups with inner (50-100%) stratification, whereas cells with thick dendrites were divided into one group with outer and 3 groups with inner stratification. We postulate, that one group of cells with thin dendrites resembles cat ß-cells, whereas one group of cells with thick dendrites includes cells that resemble cat a-cells.
Acesso aberto (Open Access)
Division of labor between M and P visual pathways: different visual pathways minimize joint entropy differently
(2008-06) SILVEIRA, Luiz Carlos de Lima; SAITO, Cézar Akiyoshi; MELLO JÚNIOR, Harold Dias de; SILVEIRA, Vladímir de Aquino; SOUZA, Givago da Silva; RODRIGUES, Anderson Raiol; SILVA FILHO, Manoel da
Visual perception and action are strongly linked with parallel processing channels connecting the retina, the lateral geniculate nucleus, and the input layers of the primary visual cortex. Achromatic vision is provided by at least two of such channels formed by the M and P neurons. These cell pathways are similarly organized in primates having different lifestyles, including species that are diurnal, nocturnal, and which exhibit a variety of color vision phenotypes. We describe the M and P cell properties by 3D Gábor functions and their 3D Fourier transform. The M and P cells occupy different loci in the Gábor information diagram or Fourier Space. This separation allows the M and P pathways to transmit visual signals with distinct 6D joint entropy for space, spatial frequency, time, and temporal frequency. By combining the M and P impacts on the cortical neurons beyond V1 input layers, the cortical pathways are able to process aspects of visual stimuli with a better precision than it would be possible using the M or P pathway alone. This performance fulfils the requirements of different behavioral tasks.
Acesso aberto (Open Access)
Estimativa da sensibilidade ao contraste espacial de luminância e discriminação de cores por meio do potencial provocado visual transiente
(2006) GOMES, Bruno Duarte; SOUZA, Givago da Silva; RODRIGUES, Anderson Raiol; SAITO, Cézar Akiyoshi; SILVA FILHO, Manoel da; SILVEIRA, Luiz Carlos de Lima
The Visual Evoked Potential (VEP) is a cortical response obtainable on the scalp. It usually reflects the activity from V1 neurons. It is classified in transient or steady-state, according with the temporal frequency of stimulation. Other stimuli properties evoke a selective activity from different neuronal groups found in V1. This way, VEP have been used to study luminance and chromatic human vision. Several studies used VEP to estimate luminance contrast sensitivity in the spatial frequency domain. More recently, some studies used VEP to measure color discrimination thresholds. The transient VEP shows a good agreement with psychophysical measurements of spatial luminance contrast sensitivity and color discrimination, being a noninvasive method to study vision from subjects with difficulty to perform psychophysical tests.
Acesso aberto (Open Access)
Principais queixas vocais de pacientes idosos pós-tratamento para hanseníase
(2010-04) PALHETA NETO, Francisco Xavier; SILVA FILHO, Manoel da; PANTOJA JUNIOR, José Mariano Soriano; TEIXEIRA, Larissa Lane Cardoso; MIRANDA, Rafaela Vale de; PALHETA, Angélica Cristina Pezzin
Leprosy is an infectious disease, with vocal involvement varying between hoarseness and difficult breathing. AIM: compare the main vocal complaints among elderly patients after treatment for leprosy and a control group. STUDY DESIGN: descriptive prospective. MATERIALS AND METHODS: We included 50 patients aged over 60 years, 32 had been treated for leprosy, and the others formed the control group. We used our own questionnaire to analyze the vocal symptoms presented by the two groups, as well as gender, age, life style and comorbidities. RESULTS: among the treated group, the most frequent symptoms were hawk (34.4%) and hoarseness (28.1%), while in the control group the most prevalent symptoms were hoarseness (77.8%) and a foreign body sensation (55.6%). CONCLUSION: the most prevalent voice complaints in patients treated for leprosy are hawking and hoarseness, and that its development is influenced by life style and associated diseases.
Acesso aberto (Open Access)
Principais queixas vocais de pacientes idosos pós-tratamento para hanseníase
(Sociedade Brasileira de Geologia, 2010-04) PALHETA NETO, Francisco Xavier; SILVA FILHO, Manoel da; PANTOJA JUNIOR, José Mariano Soriano; TEIXEIRA, Larissa Lane Cardoso; MIRANDA, Rafaela Vale de; PALHETA, Angélica Cristina Pezzin
Leprosy is an infectious disease, with vocal involvement varying between hoarseness and difficult breathing. Aim: compare the main vocal complaints among elderly patients after treatment for leprosy and a control group. Study design: descriptive prospective. Materials and methods: We included 50 patients aged over 60 years, 32 had been treated for leprosy, and the others formed the control group. We used our own questionnaire to analyze the vocal symptoms presented by the two groups, as well as gender, age, life style and comorbidities. Results: among the treated group, the most frequent symptoms were hawk (34.4%) and hoarseness (28.1%), while in the control group the most prevalent symptoms were hoarseness (77.8%) and a foreign body sensation (55.6%). Conclusion: the most prevalent voice complaints in patients treated for leprosy are hawking and hoarseness, and that its development is influenced by life style and associated diseases.
Acesso aberto (Open Access)
Relationships between dendritic morphology, spatial distribution and firing patterns in rat layer 1 neurons
(2012-12) SANTOS, Daniel Valle Vasconcelos; COSTA, Kauê Machado; SILVA FILHO, Manoel da; VAZ, Manoella Cristina Gadelha
The cortical layer 1 contains mainly small interneurons, which have traditionally been classified according to their axonal morphology. The dendritic morphology of these cells, however, has received little attention and remains ill defined. Very little is known about how the dendritic morphology and spatial distribution of these cells may relate to functional neuronal properties. We used biocytin labeling and whole cell patch clamp recordings, associated with digital reconstruction and quantitative morphological analysis, to assess correlations between dendritic morphology, spatial distribution and membrane properties of rat layer 1 neurons. A total of 106 cells were recorded, labeled and subjected to morphological analysis. Based on the quantitative patterns of their dendritic arbor, cells were divided into four major morphotypes: horizontal, radial, ascendant, and descendant cells. Descendant cells exhibited a highly distinct spatial distribution in relation to other morphotypes, suggesting that they may have a distinct function in these cortical circuits. A significant difference was also found in the distribution of firing patterns between each morphotype and between the neuronal populations of each sublayer. Passive membrane properties were, however, statistically homogeneous among all subgroups. We speculate that the differences observed in active membrane properties might be related to differences in the synaptic input of specific types of afferent fibers and to differences in the computational roles of each morphotype in layer 1 circuits. Our findings provide new insights into dendritic morphology and neuronal spatial distribution in layer 1 circuits, indicating that variations in these properties may be correlated with distinct physiological functions.