Sandro Ferreira

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This work presents an implementation of a Direct Torque Control (DTC) strategy, which is used to control induction motors. Following a tendency in the research area, the algorithm proposed is implemented in an unique FPGA substrate, which allows for a faster validation andsimplifies the control structure. A binary format is used with a variable word-size(More)
[Purpose] This study investigated the effects of musical tempo on physiological, affective, and perceptual responses as well as the performance of self-selected walking pace. [Subjects] The study included 28 adult women between 29 and 51 years old. [Methods] The subjects were divided into three groups: no musical stimulation group (control), and 90 and 140(More)
[Purpose] The aim of this study was to observe the effect of self-selected intensity or imposed intensity during aerobic training on perceptual and affective responses in obese women. [Subjects] The study included 26 obese women aged 30-60 years. [Methods] The subjects were randomly divided into two groups, with 13 subjects in each group: self-selected(More)
[Purpose] The aim of the present study was to verify the rate of perceived exertion and feelings of pleasure/displeasure in elderly women, who did normally perform physical exercises, following eight weeks of strength training in a constant routine. [Subjects and Methods] Eleven sedentary women were subjected to anthropometric assessment. The maximum load(More)
The rating of perceived exertion (RPE) is ability to detect and interpret organic sensations while performing exercises. This method has been used to measure the level of effort that is felt during weight-training at a given intensity. The purpose of this investigation was to compare session RPE values with those of traditional RPE measurements for(More)
—A variable transimpedance amplifier suitable for low power wireless personal area network is presented from top-level specifications to circuit level design. Its specifications are defined and justified for a direct conversion receiver architecture. A multiple-feedback-loop topology which allows for programmable gain, constant bandwidth, and DC attenuation(More)
This study investigated the perceptual and affective responses of different muscle actions during weight training in older women. Fourteen women between 60 and 75 yrs of age participated in this research. All subjects completed four exercise sessions. During the first session, maximum strength was determined (1RM) in the following exercises: lying supine,(More)
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