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Caxias do Sul, Brazil

Ribeiro D.C.,Faculdade da Serra Gaucha | Ribeiro D.C.,University of Otago | Loss J.F.,Federal University of Rio Grande do Sul
Motor Control | Year: 2010

Link segment models are usually used to calculate proximal net reaction forces (PRF), as well as, proximal net moments (PNM). The correlation between electromyographic data and PNM is usually used to verify the model's results. Nevertheless, this method permits only a qualitative verification of the obtained results. To assess model's results in a quantitative perspective, another approach is needed. The aim of the current study was to assess the propagation of uncertainty on a link segment model results and identify the main sources of error on the quantification of PRF and PNM. One male performed five repetitions of different upper limb movements. An inverse dynamics approach associate with 3D link segment model was used to quantify PRF and PNM. The results of the model were evaluated by the use of Kleine and McClintock's equation. The propagation of uncertainty for PRF reached, on average, 0.27 and for PNM, 0.97. The main cause of propagation of uncertainty was associated to the second time derivative calculations. Consequently, it is possible to suggest that the reduction of small distortions of center of mass acceleration will diminish the proximal net moment and proximal reaction force uncertainty values. © 2010 Human Kinetics, Inc. Source

Garcez M.E.,University of Caxias do Sul | Branco C.S.,University of Caxias do Sul | Lara L.V.,University of Caxias do Sul | Spada P.D.S.,Faculdade da Serra Gaucha | And 2 more authors.
Jornal Brasileiro de Reproducao Assistida | Year: 2011

The aim of this study was to analyze potential beneficial effects of adding ascorbic acid to cryopreservation media of semen of infertile men. Semen from 20 infertile and 10 fertile (control group) men was cryopreserved with and without 10 mM ascorbic acid. Addition of ascorbic acid to the cryopreservation media was able to reduce the lipid oxidative damage induced by the cryopreservation process and increase the antioxidant enzyme superoxide dismutase activity in infertile men. However, this antioxidant was not able to avoid the loss of motility observed in post-thaw spermatozoa of both infertile and fertile men. Source

Tiggemann C.L.,Faculdade da Serra Gaucha | Dias C.P.,Faculdade da Serra Gaucha | Noll M.,Federal University of Rio Grande do Sul | Schoenell M.C.W.,Federal University of Rio Grande do Sul | Kruel L.F.M.,Federal University of Rio Grande do Sul
Revista da Educacao Fisica | Year: 2013

The proportion of elderly in the population is growing in different countries, which makes essential to examine this part of the population in different perspectives. In this way, the objective of this review is to understand how aging affects the neuromuscular system, especially muscle strength, and how this decline works on functional aspects, i.e. on everyday tasks. In addition, it is investigated how strength training, specifically aimed at improving muscle strength, can be a safe and effective strategy in combating the adverse effects of aging on neuromuscular system. Source

Timm A.U.,Faculdade da Serra Gaucha | Roberti D.R.,Federal University of Santa Maria | Streck N.A.,Federal University of Santa Maria | de Goncalves L.G.G.,National Institute for Space Research | And 6 more authors.
Journal of Hydrometeorology | Year: 2014

During approximately 80% of its growing season, lowland flooded irrigated rice ecosystems in southern Brazil are kept within a 5-10-cm water layer. These anaerobic conditions have an influence on the partitioning of the energy and water balance components. Furthermore, this cropping system differs substantially from any other upland nonirrigated or irrigated crop ecosystems. In this study, daily, seasonal, and annual dynamics of the energy and water balance components were analyzed over a paddy rice farm in a subtropical location in southern Brazil using eddy covariance measurements. In this region, rice is grown once a year in low wetlands while the ground is kept fallow during the remaining of the year. Results show that the energy budget residual corresponded to up to 20% of the net radiation during the rice-growing season and around 10% for the remainder of the year (fallow). The energy and water balance analysis also showed that because of the high water table in the region, soil was near saturation most of the time, and latent heat flux dominated over sensible heat flux by up to one order of magnitude in some cases. The estimate of evapotranspiration ET using the crop coefficient multiplied by the reference evapotranspiration KcETo and the Penman-Monteith equation ETPM, describing the canopy resistance through leaf area index (LAI) obtained by remote sensing, represent well the measured evapotranspiration, mainly in the fallow periods. Therefore, using a specific crop parameter like LAI and crop height can be an easy and interesting alternative to estimate ET in vegetated lowland areas. © 2014 American Meteorological Society. Source

Bruno F.B.,Faculdade da Serra Gaucha | Silva T.L.K.,Federal University of Rio Grande do Sul | Silva R.P.,Federal University of Rio Grande do Sul | Teixeira F.G.,Federal University of Rio Grande do Sul
Campus-Wide Information Systems | Year: 2012

Purpose: The purpose of this paper is to propose a web-based tool that enables the development and provision of learning designs and its reuse and re-contextualization as generative learning objects, aimed at developing educational materials. Design/methodology/approach: The use of learning objects can facilitate the process of production and delivering of educational material and their reuse and re-contextualization in different scenarios - such process is due to the current development stage of information and communication technologies (ICTs), which allow easy access to products and services related to them. ICTs combined with instructional design theories, lead to the emergence of new generations of distance learning, which add educational content to web-based services. From this combination rises a hybrid mode of education, which combines tools for face-to-face and distance learning (blended learning). Findings: The use of the web as a platform for production and management of learning objects comes as a solution for storage and sharing. The utilization of objects is justified when its reusability is facilitated. This gives rise to possibilities in a client-server environment, where information is centralized and available anywhere in the network. Research limitations/implications: The combination of ICT and instructional design theories has potential and could result in hybrids which are yet to be fully understood and explored. This can enhance blended learning provision. Originality/value: The paper presents a tool in which the learning designs work as structures built on XML, based on concept maps, which act as an interaction layer between the learning objects, organizing the content to be available. © Emerald Group Publishing Limited. Source

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