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Open access

Alexandre Eiras, Rodrigo Reis, Pierre Silva, André Monteiro and Marco Machado

Comparison of two different rest intervals on drop jump: effects on muscle damage markers

Study aim: To determine the effects of 60- or 180-s rest intervals between sets of drop jump (DJ) exercise on serum creatine kinase (CK) activity and perceived muscle soreness.

Materials and methods: A group of 36 healthy male subjects aged 18 - 19 years performed 4 sets of 10 DJ, the rest intervals between sets amounting to 60 (Group A) or 180 s (Group B). Before, as well as 3, 24, 48, and 72 h post-exercise, blood was sampled for determining the activity of in serum CK activity and the perceived muscle soreness was reported. Two-way ANOVA (time x rest interval) was used in data analysis.

Results: The DJ sessions induced muscle soreness and elevated serum CK activity (p<0.05). No significant between-group differences were found.

Conclusion: Rest intervals of 1 - 2 min duration had no effect on the magnitude of changes in CK activity or perceived muscle soreness. This may be of practical importance when designing training which includes drop jumps.

Open access

Elton Souza, Valtair Cristante, Pedro Padilha, Sonia Jorge, Marco Martines, Rafael Silva, Devaney Carmo and Gustavo Castro

Attachment of 2,2-bipyridine onto a silica gel for application as a sequestering agent for copper, cadmium and lead ions from an aqueous medium

A method was developed to attach 2,2-bipyridine (BP) onto a silica gel surface by a two-step reaction. The first step consisted of a reaction between the matrix and a silylating agent, 3-chloropropyltrimethoxysilane. In the second step of the reaction, a ligand molecule was attached onto Si-CPTS, yielding the product Si-BP. The modified material contained 0.431±0.01 mmol of 2,2-bipyridine per gram of modified silica, as confirmed by FT-IR spectra of the proposed structure. The surface modification was characterized by the BET technique, which revealed a decrease in the surface area from 614 to 450 m2 g-1. The series of adsorption isotherms for the metal ions were adjusted to fit a modified Langmuir equation. The maximum number of moles of copper, cadmium and lead ions adsorbed was 0.64, 0.53, and 0.54 mmol g-1, respectively. The surface saturation was calculated as φ fraction and the values obtained, Cu(II) = 1.160, Cd(II) = 1.044 and Pb(II) = 0.997, suggest a type 1:1 metal-ligand complex.

Open access

Armando Peixoto, Marco Silva, Rui Gaspar, Rui Morais, Rosa Ramalho, Guilherme Macedo and João Santos-Antunes

Abstract

The eradication of Helicobacter pylori is essential for prevention and treatment of various conditions associated with this infection. However, its effectiveness is limited and influenced by factors linked to the bacteria and the host. In particular, influence of the biotype, smoking, diabetes mellitus, and previous treatment failure in eradication is understudied. Our center proposed to evaluate these aspects in a real life cohort by applying a questionnaire with demographic and lifestyle variables in patients who consecutively underwent urease breath test after the eradication therapy.

Open access

Rafael Pereira, Max Miller Alves Mendel, Ludmila Schettino, Marco Machado and Pierre Augusto-Silva

Abstract

Purpose. The purpose of this study was to examine and compare acute neuromuscular behavior during a resistance exercise session (RES) conducted with the DeLorme and Oxford techniques. Methods. Seven healthy and trained participants volunteered to carry out two RES, one week apart, of unilateral elbow flexion. Each session was conducted with the DeLorme or Oxford techniques in a counterbalanced order. Electromyographic (EMG) data were recorded from the biceps brachii (BB) and triceps brachii (TRIC) during a maximal isometric voluntary contraction. Normalized EMG amplitude from BB and TRIC and the co-contraction ratio (CCR) during the concentric and eccentric phases were calculated. Results. The EMG amplitude from BB and TRIC as well as the CCR of both the concentric and eccentric phases were similar in both techniques. Additionally, normalized EMG amplitude from BB was higher during the concentric phase when compared with the eccentric phase for both techniques, supporting the hypotheses of distinct neural control for concentric and eccentric phases of movement. The DeLorme and Oxford techniques induced similar acute neuromuscular responses during the RES. Conclusions. Our results may support previous findings on similar strength gains after resistance training performed with both analyzed techniques.

Open access

Glêbia Alexa Cardoso, Alexandre Sérgio Silva, Alesandra Araújo de Souza, Marcos Antônio Pereira dos Santos, Raquel Suelen Brito da Silva, Lavoisiana Mateus de Lacerda and Maria Paula Motae

Abstract

This study investigated the chronic and acute influence of resistance exercise on blood pressure in women with metabolic syndrome before and after climacteric. Twenty sedentary women, nine non-menopausal (RNM) and 11 menopausal (RM), performed training for 12 weeks. Meanwhile, 23 controls, 11 not menopausal (CNM) and 12 menopausal (CM), remained sedentary. Blood pressure was measured before and after the training period in conditions of rest and after a session of exercise. Training promoted variations in blood pressure at rest from 116±13 to 118±10 mmHg (p=0.73) and from 128±12 mmHg to 120±11mmHg (p=0.12) in RNM and RM, respectively. CNM and CM varied from 115±11 to 116±12 mmHg (p=0.9) and from 115±14 mmHg to 116±13 mmHg (p=0.74). Blood pressure values in one acute session did not differ between groups (p>0.05). Resistance training did not improve blood pressure in women with metabolic syndrome, regardless of climacteric.

Open access

Carla Cristina Gonçalves Rosado, Lúcio Mauro Da Silva Guimarães, Miranda Titon, Douglas Lau, Leonardo Rosse, Marcos Deon Vilela De Resende and Acelino Couto Alfenas

Abstract

Ceratocystis wilt, caused by Ceratocystis fimbriata, is one of the most damaging diseases in eucalyptus plantations worldwide. Although there are resistant genotypes, the genetic basis of resistance is still poorly understood. In this paper we studied the resistance level by a stem inoculation experiment of genotypes of Eucalyptus grandis and E. urophylla and estimated the heritability and gains of selection in families derived from controlled interspecific crosses. In both species, highly resistant as well as highly susceptible genotypes to Ceratocystis wilt were found. Out of 21 parents assessed, twelve were resistant and nine susceptible. Estimates of individual narrow (50%) and broad (59%) sense heritability suggested a high degree of genetic control and low allelic dominance of the trait. There was great genetic variation among and within families, a fact that contributes to high heritability and genetic gain. A genetic gain in lesion size of up to -74.4% was obtained from selection of the 50 best clones in the evaluated families, i.e., the mean lesion length in the progeny population can be reduced by 74,4%.

Open access

Mauro de Souza e Silva, Adalberto de Souza Rabelo, Rodrigo Vale, Max Ferrão, Leila Gonçalves, Marcos de Sá Rego Fortes, Sérgio Moreira and Estélio Dantas

Effects of two kinds of aerobic training on body fat content and serum lipid profile in cadets

Study aim: To assess the effects of aerobic training on body fat content and serum lipid profile.

Material and methods: A group of 45 male members of Brazilian Military Police Academy, aged 18 - 32 years, were subjected randomly assigned into 3 subgroups and to 12-week programmes: aerobic fatmax zone training (FG; n = 18), traditional military training (TM; n = 15) and non-training control group (C; n = 12). Body fat content (3 skinfolds), serum lipid profile (total cholesterol, LDL, HDL and triglycerides), waist circumference (WC) and O2max (12-min test) were determined.

Results: O2max significantly (p<0.05) increased and body fat content decreased in both experimental group compared with the control one. Significant (p<0.05) reductions in WC and LDL vs. control group were observed in the TM group only.

Conclusions: The applied aerobic training induced a decrease in percent body fat irrespectively of the kind of training.

Open access

Leandro Mauricio Medeiros Vieira, Marcos Ferasso and Christine da Silva Schröeder

Abstract

This theoretical essay is a learning approach reflexion on Howard Gardner’s Theory of Multiple Intelligences and the possibilities provided by the education model known as open and distance learning. Open and distance learning can revolutionize traditional pedagogical practice, meeting the needs of those who have different forms of cognitive understanding. This tool has in itself the potential to build knowledge collectively. The conclusions raise new questions for future discussion, shedding some light on the open and distance learning not as a mere tool to spread education, but as a means to reach new levels of comprehension and consciousness, reflecting on the role of education itself.

Open access

Henrique von Hertwig Bittencourt, Lisandro Tomas da Silva Bonome, Fortunato de Bortoli Pagnoncelli, Marcos Alberto Lana and Michelangelo Muzell Trezzi

Abstract

Eragrostis tenuifolia is a weed species that is gaining ground in Brazil. This weed occurs in pastures, grasslands, crop fields, and roadsides. The objective of this study was to examine the effects of different environmental factors on E. tenuifolia seed germination and seedling emergence. The optimum constant temperature for germination was around 35-30°C. It was also found that 85% of seeds germinated under a 30/20°C alternate temperature regime. Light appears to have a positive effect on seed germination. No seedlings emerged when seeds were buried 3 cm or deeper. The results suggested that E. tenuifolia has the potential to spread into pastures and in no-tillage crop systems in Brazil. Measures such as the use of cover crops and/or soil cultivation can be used to limit germination and seedling emergence, respectively.

Open access

Reinaldo Roberto Correia Lima, Caio Victor Coutinho De Oliveira, Jorge Luiz De Brito Gomes, Cyntia Nislane Pereira Da Silva, Adriene Melo De Souza, Aline Nóbrega Rabay, Thamires Barbosa Da Silva, Marcos Antônio Pereira Dos Santos and Aline De Freitas Brito

Abstract

Purpose. The potential of functional training (FT) to improve health is evident. However, regarding post-exercise hypotension (PEH) in older adults, there are few data. The study aimed to determine the cardiometabolic demand imposed by an FT session and evaluate PEH, comparing it with exercise sessions with aerobic and resistance exercises in physically active practitioners.

Methods. Fourteen young (23.3 ± 2 years) and 15 older (68 ± 4 years) adults underwent a control session and FT session randomly determined. Blood pressure, heart rate, and double product were recorded at rest, during exercise, and in every 10 minutes over 60 minutes of recovery. Additionally, we measured the rate of perceived exertion (RPE).

Results. The FT protocol promoted systolic PEH in both groups in the last half of recovery, reaching a reduction of 10.4 ± 4.9 mm Hg in young and 13.4 ± 3.8 mm Hg in older adults (p < 0.05). No differences were observed between the groups (p > 0.05). There were no differences between the groups with reference to RPE at any time (p > 0.05).

Conclusions. A single FT session is able to promote PEH in normotensive young and borderline hypertensive older adults but without changing the RPE in comparison over the time, owing to a great similarity of FT practices in the groups.