Universidade São Judas Tadeu

About: Universidade São Judas Tadeu is a education organization based out in São Paulo, Brazil. It is known for research contribution in the topics: Aerobic exercise & Baroreflex. The organization has 736 authors who have published 852 publications receiving 4782 citations.

Interpretation of propulsive force in tethered swimming through principal component analysis

Abstract: Introduction: Propulsive force in swimming, represented through impulse, is related to performance. However, since the as different biomechanical parameters contribute to impulse generation, coaches have a difficult task when seeking for performance improvement. Objective: Identify the main components involved in impulse generation in the front crawl stroke. Methods: Fourteen swimmers underwent a 10-second all-out fully tethered swimming test. The following parameters were obtained from the force-time curve: minimum force, peak force, mean force, time to peak force, rate of force development and stroke duration. This stage was followed by a principal component analysis. Results: The principal component analysis showed that component 1, predominantly kinetic, was composed of peak force, mean force and rate of force development, and accounted for 49.25% of total impulse variation, while component 2, predominantly temporal, composed of minimum force, stroke duration, and time to peak force, represented 26.43%. Conclusion: Kinetic parameters (peak force, mean force, and rate of force development) are more closely associated with impulse augmentation and, hypothetically, with non-tethered swimming performance. Level of Evidence II; Diagnostic studies - Investigating a diagnostic test.

Avaliação de fatores de risco cardiovascular em praticantes de atividade física não orientada

Abstract: A pratica de atividade fisica e recomendada como terapia nao farmacologica na prevencao do desenvolvimento de doencas cardiovasculares. No entanto, os beneficios dessa pratica dependem de uma orientacao adequada. Logo, o presente estudo teve como objetivo avaliar a prevalencia de fatores de risco cardiovascular, a existencia de recomendacao medica para a realizacao de atividade fisica e a pratica que vem sendo adotada em usuarios de um parque publico do municipio de Sao Paulo. Os praticantes (21 homens e 25 mulheres) foram convidados a responder um questionario sobre a presenca de fatores de risco, tipo, duracao, intensidade e frequencia de realizacao de atividade fisica. Os resultados demonstraram que das 46 pessoas avaliadas, 63% apresentavam 2 ou mais fatores de risco associados. Os fatores mais prevalentes foram o tabagismo, historico familiar, diabetes mellitus e elevado indice de cintura quadril. A maioria dos usuarios (76%) nao possuia recomendacao medica para a pratica de exercicio fisico. Alem disso, foi verificado que entre todos os praticantes apenas 17% realizavam atividade fisica conforme recomendacoes minimas para beneficio cardiovascular (atividade moderada, 30 minutos por sessao, ao menos 3 vezes por semana). Alem disso, foi observado que 6,5% praticavam exercicio com alta intensidade. Tais dados sugerem que, embora a atividade fisica venha sendo recomendada no tratamento e na prevencao das doencas cardiovasculares, falta orientacao a populacao que frequenta o parque publico, como espaco alternativo para realizar tal pratica. Dessa forma, a realizacao de atividade fisica nao supervisionada pode nao proporcionar beneficios reais para a diminuicao dos fatores de risco cardiovascular na populacao.

Transitory recovery time of bio-potential amplifiers that include CMOS pseudo-resistors

Abstract: In this paper a study of the recovery time after a high-amplitude input transitory voltage is evaluated, for a low-frequency bio-potential amplifier. The importance of this parameter for very small low frequency cut-off circuits relies on the expectation, given by the linear model, that the amplifier may take hundreds of seconds to come out of the saturation state, what could be unacceptable for real applications. Actually, the nonlinearity of some components that are used in the amplifiers feedback circuit, particularly the CMOS pseudo-resistors, contributes to the reduction of the recovery time. The bio-amplifier evaluation was carried out using a typical two-stage circuit topology. The circuit behavior is evaluated for several CMOS pseudo-resistor values, with nMOS and pMOS solutions, using a new pseudo-resistor non-linear model. The frequency response target is a 10KHz bandwidth with low frequency cutoff of 1Hz (−3dB). The behavior was evaluated using a MOSIS SCN05 technology (0.5µm) and BSIM3V3.1 models on Eldo™ SPICE analog simulator.

Estado, democracia e tecnologia: conflitos políticos no contexto do big-data, das fake news e das shitstorms

Abstract: O presente artigo trata dos impactos que as novas tecnologias e alguns de seus potenciais fenomenos correspondentes (big-data, shitstorm, candystorm e fake news) tem sobre os processos eleitorais e, consequentemente, o modelo democratico existente na atualidade. Este trabalho se desenvolve a partir de um estudo interdisciplinar, abrangendo um conceitual teorico de ciencias ligadas com comunicacao, tecnologia, direito e politica. O objetivo deste artigo e descrever os fenomenos do big-data, shitstorm, candystorm e fake news, a partir da literatura academica existente, e indicar como todos eles terao uma relevância crescente no desenvolvimento dos processos eleitorais contemporâneos, criando a necessidade de novas iniciativas, no nivel do Executivo, Legislativo e Judiciario, para evitar consequencias deleterias capazes de afetar o equilibrio das disputas eleitorais e a democracia como um todo.

Sweat rate measurements after high intensity interval training using body weight

Abstract: Introduction: Physical activity raises body temperature, increases the sweat rate and accelerates fluid loss during exercise, thereby impairing exercise performance. However, studies using the high intensity interval training (HIIT) approach and its effects on rates of perspiration and hydration are still inconclusive. Objectives: The objective of this study was to assess sweating and water loss during an HIIT workout session, using body weight, with healthy college students. Methods: Twenty male individuals (31 ± 07 years) were split into two groups: Active group (AG) and Inactive group (IG). The HIIT workout protocol, using body weight, consisted of a single bout with 1:1 stimuli, being: 30” “all out” intensity, involving jumping jack, mountain climber, burpee and squat jump exercises; and 30” of passive recovery, totaling 20 minutes of exercises. For comparison purposes, after 48 hours all the individuals underwent the continuous running protocol with intensity corresponding to 75% of maximum heart rate for 40 minutes. The intensity of the session was monitored continuously, at each 30”, using the perceived exertion scale for both protocols. To ensure euhydration status, all individuals ingested 500 ml of water 120 minutes before the training session. Results: Significant differences (p= 0.01) were found in body mass after HIIT compared to the Moderate session in both Active (HIIT: -0.60 ± 0.29 kg, Moderate: -0.26 ± 0.12 kg) and Inactive (HIIT: -0.92 ± 0.30 kg, Moderate: -0.26 ± 0.26 kg) groups, however, no differences were found between groups. Absolute sweating rate values comparing moderate and HIIT single bout in Inactive (Moderate: 10.55 ± 10.59 ml/min; HIIT: 28.90 ± 13.88 ml/min) and Active (Moderate: 9.60 ± 4.52 ml/min; HIIT: 26.00 ± 15.06 ml/min) groups were different between types of exercise, but not between groups. Conclusions: The sweating rate is influenced by the intensity of the exercise, being higher after HIIT than after a moderate exercise session. However, the sweating rate variation is not affected by the subjects’ physical activity level. Level of Evidence II; Diagnostic studies-Investigating a diagnostic test.