Marcelo Fernandes

Six-minute walking test in children

Implications for Rehabilitation Six-minute walking test. The six-minute walking test is safe and widely performed in the world because of its easy implementation and low cost. Many countries have established normal values to the six-minute walking test in healthy children. However, the applicability of this test also gains popularity among children with other disease conditions.

Reference Values for the 6-min Walk Distance in Healthy Children Age 7 to 12 Years in Brazil: Main Results of the TC6minBrasil Multi-Center Study

INTRODUCTION: Brazil is a country with great climatic, socioeconomic, and cultural differences that does not yet have a reference value for the 6-min walk test (6MWT) in healthy children. To avoid misinterpretation, the use of equations to predict the maximum walk distance should be established in each country. OBJECTIVES: We sought to establish reference values and to develop an equation to predict the 6-min walk distance for healthy children in Brazil. METHODS: This is a cross-sectional multi-center study that included 1,496 healthy children, aged 7 to 12 y, assessed across 11 research sites in all regions of Brazil, and recruited from public and private schools in their respective regions. Each child was assessed for weight and height. Walk distance was our main outcome. An open-source software environment for statistical computing was used for statistical analysis. RESULTS: We observed a higher average distance walked by boys (531.1 m) than by girls (506.2 m), with a difference of 24.9 m (P < .001). We established 6MWT reference values for boys with the following equation: Distance = (16.86 × age) + (1.89 × Δ heart rate) − (0.80 × weight) + (336.91 × R1) + (360.91 × R2). For girls the equation is as follows: Distance = (13.54 × age) + (1.62 × Δ heart rate) − (1.28 × weight) + (352.33 × R1) + (394.81 × R2). CONCLUSION: Reference values were established for the 6MWT in healthy children aged 7–12 y in Brazil.

Reference Values for the Six-Minute Walk Test in Healthy Children and Adolescents: a Systematic Review

Objective The aim of the study is to compare the available reference values and the six-minute walk test equations in healthy children/adolescents. Our systematic review was planned and performed in accordance with the PRISMA guidelines. We included all studies that established reference values for the six-minute walk test in healthy children/adolescents. Methods To perform this review, a research was performed in PubMed, EMBASE (via SCOPUS) and Cochrane (LILACS), Bibliographic Index Spanish in Health Sciences, Organization Collection Pan-American Health Organization, Publications of the World Health Organization and Scientific Electronic Library Online (SciELO) via Virtual Health Library until June 2015 without language restriction. Results The initial research identified 276 abstracts. Twelve studies met the inclusion criteria and were fully reviewed and approved by both reviewers. None of the selected studies presented sample size calculation. Most of the studies recruited children and adolescents from school. Six studies reported the use of random samples. Most studies used a corridor of 30 meters. All studies followed the American Thoracic Society guidelines to perform the six-minute walk test. The walked distance ranged 159 meters among the studies. Of the 12 included studies, 7 (58%) reported descriptive data and 6 (50%) established reference equation for the walked distance in the six-minute walk test. Conclusion The reference value for the six-minute walk test in children and adolescents ranged substantially from studies in different countries. A reference equation was not provided in all studies, but the ones available took into account well established variables in the context of exercise performance, such as height, heart rate, age and weight. Countries that did not established reference values for the six-minute walk test should be encouraged to do because it would help their clinicians and researchers have a more precise interpretation of the test.

Instruments to assess quality of life in patients with heart failure

Introduction : Heart failure (HF) is a complex clinical syndrome representing the common final pathway of various heart diseases. It is characterized by low exercise tolerance, low survival rates and deteriorated quality of life. Several studies mention Quality of Life (QoL) as an important source of information on how disease truly affects patients lives. In this context, the assessment of QoL is extremely important to provide data that support the choice of a therapeutic strategy and the assessment of the effectiveness of a treatment. Objectives : This study aimed to investigate and identify the most appropriate and widely used instrument for the assessment of quality of life in patients with HF. Methods : We searched the databases of Lilacs, Medline, Pubmed, Scielo and CAPES to identify relevant articles published in English and Portuguese between 2000 and 2010. Results : We found 25 papers that described, quoted or used instruments for the assessment of QoL in patients with HF. Conclusion : The MLHFQ is the most widely used instrument to assess QoL in patients with HF. Its good metric properties have been confirmed in a large number of studies. In addition, it has a simple structure and is easy to administer, which makes it the most recommended instrument for this purpose.

A Java router based on real time traffic congestion information

This paper deals with a logistic operation in a urban enviroment. The aim of the research is to solve a routing problem in a network considering that traffic congestion has a significant impact in the route decision. The proposal model has to define the “best” route to serve a given number of points. Information about traffic congestion in the network is available over the time, and the model should take this information into consideration to define its routes. An application based on the metaheuristic tabu search has been developed to solve the routing problem. The traffic congestion data were provided by an application hosted in a cloud computing service which captured the level of congestion from a traffic management center site. The results showed that the approach worked satisfactorily and the impact of congestion was significant. The details of the proposal and all the interesting results obtained are discussed in the paper.