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Publications (101)
This study aimed to investigate recovery markers among elite climbers following the National Boulder Championship. We assessed maximum isometric hand grip strength (HS), forearm swelling (circumference), delayed soreness in forearm muscles, tiredness, and exercise readiness at several time points: precompetition, immediately post-competition (withi...
The aim of this study was to evaluate the time course of the effects of far-infrared emitting fabric (FIR) on neuromuscular performance of knee extensor over 120 h and to investigate whether the use of FIR affects semen. This is a crossover, randomized, double-blind, and placebo-controlled trial split into neuromuscular and fertility assessments. F...
The aim of this study was to verify if exposure to the far-IR emitted by fabric (FIR) is able to improve the neuromuscular performance of the knee extensors of resistance-trained males regardless of changes of the temperature. It is a crossover, randomized, double-blind, and placebo-controlled trial. Fourteen resistance-trained males (age: 24.3 ± 4...
The present study aimed to investigate the influence of months of birth on anthropometry, body composition, biological maturation, and motor performance in young Brazilian soccer players. Young Brazilian soccer players from the Under-13 (n = 50; 13.6 ± 0.3 years), Under-15 (n = 50; 15.5 ± 0.4 years), and Under-17 categories (n = 46; 17.7 ± 0.3 year...
This study analyzed the physiological adjustments caused by the use of the Elevation training mask® (2.0), an airflow restriction mask (ARM) during continuous exercise. Eighteen physically active participants (12 men and 6 women) were randomized to two protocols: continuous exercise with mask (CE-ARM) and continuous exercise without mask (CE). Exer...
Objective: To quantify and compare the electromyographic activity of 10 muscles in three pullover exercises. Methods: 15 healthy men, with at least two years of experience in resistance training, executed in random order six repetitions with 60% of 1 Maximum Repetition for three different pullover exercises: lying on a step with a barbell, grip 100...
The aim of this study was to compare the neuromuscular and cardiorespiratory capacities among CrossFit® (CF) practitioners and recreationally trained (RT) individuals. Sixteen participants between 18 and 30 years old of both sexes participated in this study. They were divided into CF Practitioners group (CF: sex= 4 men and 4 women; age= 28.6±4.3 yr...
The objective of the study was to investigate the effects of using lifting straps on the lat pull-down exercise on maximal strength, number of repetitions, and muscle activation. Twelve resistance-trained men participated (age 27 ± 4 years, body mass 84 ± 10 kg, height 177 ± 6 cm, resistance training experience 6.6 ± 2.4 years). All participants pe...
Diversos estudos que comparam as adaptações aeróbias do Treinamento Intervalado de Alta Intensidade (HIIT) e do Treinamento Aeróbio Contínuo (TAC) indicam que o HIIT pode ser mais eficiente, relacionando estas maiores adaptações a respostas induzidas por um maior estresse metabólico, provavelmente causado por uma maior participação do metabolismo a...
Teodoro, CL, Gáspari, AF, Berton, R, Barbieri, JF, Silva, M, Castaño, LAA, Guimarães, P, and Moraes, AC. Familiarization with airflow-restriction mask during resistance exercise: Effect on tolerance and total volume. J Strength Cond Res XX(X): 000-000, 2018-This study investigated whether familiarization with the airflow-restriction mask (AIRfr) in...
The aim of this study was to analyze the birth month distribution and anthropometric measurements of U-15 elite soccer players. The sample consisted of 400 athletes (15.4 ± 0.4 years, 171.0 ± 10.6 cm and 63.0 ± 8.8 kg) participants of the 11th edition of the Brazil U-15 Soccer Cup, who had their birth month information and height and body mass meas...
Jerônimo DP, Germano MD, Fiorante FB, Boreli L, Neto LVS, Souza RA, Silva FF, Morais AC. Caffeine Potentiates the Ergogenic Effects of Creatine. JEPonline 2017;20(6):66-77. The aim of this study was to determine the effect of caffeine on creatine supplementation on electromyographic activity and torque. Sixteen males were supplemented with caffeine...
Introduction: The Wingate Test (WAnT) has been used to evaluate anaerobic performance in cycle ergometer. Objective: The purpose of the present study was to analyze the EMG response of the superficial quadriceps femoris muscles during the Wingate anaerobic test (WAnT). In addition, we investigated the influence of these muscles in performance and f...
Purpose:
To investigate the effects of caffeine on performance, neuromuscular fatigue and perception of effort during high-intensity cycling exercise in moderate hypoxia.
Methods:
Seven adult male participants firstly underwent an incremental exercise test on a cycle ergometer in conditions of acute normobaric hypoxia (fraction inspired oxygen =...
BACKGROUND AND OBJECTIVE: Maximal voluntary isometric contraction (MVIC) is used to determine both peak torque (PT) and rate of torque development (RTD). Familiarization sessions are usually performed to stabilize PT and RTD when performing MVIC. However, it is not clear how many familiarization sessions are required to achieve such stability in di...
A necessidade de registro e das análises das ações individuais técnico-tática foi apresentada pela primeira vez em 1936, onde foi proposto que em cada jogo é necessário fixar a quantidade de passes e outras técnicas do jogo, bem como a efetividade dessas técnicas na evolução das ações de ataque e defesa. O futebol é um jogo interessante, onde duran...
No Futebol de alto nível é sabido que qualquer detalhe bem trabalhado ou deixado de lado pode representar, em um estágio final, o êxito ou o fracasso de uma equipe. As preparações física, técnica, tática, psicológica e nutricional atingem hoje níveis muito próximos quando comparamos equipes com as mesmas condições para buscarem o máximo rendimento....
AIM:
The purpose of the present study was to verify the effect of information on remaining time on physiological and perceptual responses during an intermittent exercise.
METHODS:
Ten trained cyclists participated in this study (176 ± 0.4 cm; 78.5 ± 10.4 kg; 32.5 ± 6.0 years; peak power output: 369.8 ± 37.8 W; VO2peak: 51.90 ± 10.37 mL/kg/min). An...
Frequency domain analyses in electromyographic (EMG) signals are frequently applied to assess muscle fatigue and similar variables. Moreover, Fourier-based approaches are typically used for investigating these procedures. Nonetheless, Fourier analysis assumes the signal as stationary which is unlikely during dynamic contractions. As an alternative...
Introduction
The coaching staff must adopt scientific methods in the development of optimal training programs,
aiming at an adequate recovery for an enhanced performance level. The use of simple and low-cost
methods has been studied lately. Among these methods, the use of Rating of Perceived Exertion (RPE)
and Rating of Perceived Recovery (RPR) cou...
The aim of this study was to investigate the effects of the ageing process in the electromechanical delay (EMD), rate of torque development (RTD) and peak torque (PT) of the knee extensor muscles. The volunteers were assigned to three groups: young group (YG – 23·44 ± 4·74 years, 78·14 ± 15·11 kg, 1·72 ± 0·05 m), middle-aged group (MAG – 49·56 ± 6·...
Abstract This study investigated the acute effect of a low-volume static and dynamic stretching on maximal isometric peak force (MIPF), time to maximal isometric force (TMIF), rate of force production (RFP) and average amplitude of the surface EMG (AvgEMG) of the main agonist muscles acting on the bench press maximum isometric force exercise. Thirt...
Objective: To investigate the relationship between strength and electromyographic (EMG) signal in different intensities in the bench press exercise. Methods: Eleven healthy resistance trained men (22.8 ± 3.5) participated into the present study. Maximal isometric strength was determined in the bench press exercise using a load cell. Muscle activati...
Background: The shoulder external rotator muscles and the different portions of the trapezius muscle have never been studied in exclusivity. However, the literature has provided several exercises which have been used in this study.
Purpose: To quantify electromyographic activity of the shoulder external rotator muscles and the upper, middle and low...
http://dx.doi.org/10.5007/1980-0037.2012v14n6p660
The aim of this study was to compare the electromyographic indices of fatigue (slope of median frequency) calculated with the fast Fourier transform (FFT) and wavelet transform (WT) in trained and untrained individuals during cycle exercise. A second objective was to compare the variance of the spe...
El análisis espectral de la señal de EMG en el esfuerzo supra-máximo en el cicloergómetro utilizando las transformaciones de Fourier y Wavelet: un estudio comparativo Objetivo. El propósito de este estudio fue comparar los métodos transformados de Fourier (STFT) y Wavelet (WT) para evaluar la fatiga muscular durante el ejercicio supra-máximo. Métod...
Resumo – The present study determined the neuromuscular fatigue threshold (NFT) using four different time-periods of analysis of the electromyographic signal and compared these estimations with critical power (CP). Fifteen healthy young men (73.6 ± 5.1 kg, 177.8 ± 7.0 cm, 23.4 ± 5.2 years) performed 3-4 different severe constant workload trials unt...
The purpose of this study was to analyze the performance and the electromyographic responses of the muscles Rectus Femoris, Biceps Femoris and Gastrocnemius Medialis during vertical jumping protocol. Participated 13 female volleyball players (15,6 ± 0,9 years). Initially was performed a protocol of maximum power (three maximum jumps), followed by r...
The aim of this study was to compare maximal isometric force (MIF) and the electrical activity of the vastus medialis, vastus lateralis, rectus femoris, gluteus maximus and biceps femoris long head muscles between maximal voluntary contractions (MVC) performed at different joint angles, and to identify the most suitable positions to normalize the e...
Strength training has been reported as an important tool for enhancing and maintaining health. Resistance exercises can be executed unilaterally or bilaterally. Some studies have reported lower strength and electromyography (EMG) signal values in bilateral conditions than the sum of these values in unilateral conditions. This difference in strength...
O presente estudo determinou o Limiar de Fadiga Neuromuscular LFNM usando quatro diferentes períodos de análise do sinal eletromiográfico e comparou essas estimativas com a Potência Crítica - PC. Quinze homens saudáveis do sexo masculino (73,6 ± 5,1 kg, 177,8 ± 7,0 cm, 23,4 ± 5,2 anos) realizaram 3-4 testes severos de carga constante até a exaust...
The aim of this study was to analyze the music effects on physiological and psychophysiological responses, as well as on the maximum power output attained during an incremental test. A sample of 10 healthy individuals (20.8 ± 1.4 years, 77.0 ± 12.0 kg, 179.2 ± 6.3 cm) participated in this study. It was recorded the electromyographic activity (muscl...
This study compared the activation pattern and the fatigue rate among the superficial muscles of the quadriceps femoris (QF) during severe cycling exercise. Peak oxygen consumption (VO(2)peak) and maximal accumulated oxygen Deficit (MAOD) were established by 10 well-trained male cyclists (27.5 ± 4.1 years, 71.0 ± 10.3 kg, 173.4 ± 6.6 cm, mean VO(2)...
RESUMO O objetivo deste estudo foi investigar possíveis diferenças na análise espectral do sinal EMG dos músculos superficiais do quadríceps, entre as técnicas transformadas de Fourier de tempo curto (STFT) e a contínua de Wavelet (CWT) do tipo db4 durante exercício submáximo de carga constante no cicloergômetro. Participaram do estudo 14 indivíduo...
The aim of this study was to analyze the music effects on physiological and psychophysiological responses, as well as on the maximum power output attained during an incremental test. A sample of 10 healthy individuals (20.8 ± 1.4 years, 77.0 ± 12.0 kg, 179.2 ± 6.3 cm) participated in this study. It was recorded the electromyographic activity (muscl...
The aim of this study was to analyze the music effects on physiological and psychophysiological responses, as well as on the maximum power output attained during an incremental test. A sample of 10 healthy individuals (20.8 ± 1.4 years, 77.0 ± 12.0 kg, 179.2 ± 6.3 cm) participated in this study. It was recorded the electromyographic activity (muscl...
The purpose of this study was to verify the electromyographic activity of the rectus abdominis and obliquus externus abdominis during abdominal crunch exercise performed with maximum and submaximum loads. Thirteen male and female university students participated in this investigation (18-23 years old). The subjects completed abdominal crunch exerci...
Objective. The aim of this study was to analyze the distribution of birth month of players invited to the Brazilian soccer team in all categories. Method. Therefore, the sample consisted of 167 football players invited to the Brazilian team categories of Sub-14, Sub-15, Sub-16, Sub-17, Sub-18, Sub-19, Sub-20 and main team. Only the athletes who too...
Distribution of soccer players of the Brazilian teams by month of birth Objective. The aim of this study was to analyze the distribution of birth month of players invited to the Brazilian soccer team in all categories. Method. Therefore, the sample consisted of 167 football players invited to the Brazilian team categories of Sub-14, Sub-15, Sub-16,...
The purpose of this study was to verify the electromyographic activity of the rectus abdominis and obliquus externus abdominis during abdominal crunch exercise performed with maximum and submaximum loads. Thirteen male and female university students participated in this investigation (18-23 years old). The subjects completed abdominal crunch exerci...
The aim of this study was to investigate the influence of different time-periods of analysis of submaximal tests on the determination of the maximal accumulated oxygen deficit (MAOD), by adopting different time slots of 4 to 6, 6 to 8 and 8 to 10 min. Ten cyclists with a mean age of 27.5 ± 4.1 years, body mass 74.4 ± 12.7 kg and time experience of...
The aims of this study were to verify the relationship between rating of perceived exertion (RPE) and electromyography (EMG) increases during exhaustive constant-load cycling bouts and, to compare and to correlate the power outputs corresponding to perceived exertion threshold (PET) and neuromuscular fatigue threshold (NFT). 11 men completed 3-4 di...
Frequency domain analyses of changes in electromyographic (EMG) signals over time are frequently used to assess muscle fatigue. Fourier based approaches are typically used in these analyses, yet Fourier analysis assumes signal stationarity, which is unlikely during dynamic contractions. Wavelet based methods of signal analysis do not assume station...
Frequency domain analyses of changes in electromyographic (EMG) signals over time are frequently used to assess muscle fatigue. Fourier based approaches are typically used in these analyses, yet Fourier analysis assumes signal stationarity, which is unlikely during dynamic contractions. Wavelet based methods of signal analysis do not assume station...
Aim: The aim of the study was to investigate the effects of caffeine intake on anaerobic performance and rate of muscle fatigue in young men and women. Methods: Fourteen recreationally active college students volunteered to the study (7 male, 29.1 ± 2.8 y and 7 female, 22.5 ± 2.9 y) (73.06 ± 13.08 Kg, 173.00 ± 6.90 cm, 24.08 ± 3.01Kg/m 2). The part...
Different training levels, combined with experience in performing exhaustive exercise, may produce different sensations of fatigue. The objective of this study was to compare the rating of perceived exertion (RPE) between cyclists and non-cyclists during a maximal incremental test (ITMAX). Twenty-three subjects were recruited and divided into a cyc...
The purpose of this study was to identify and compare the Electromyographic Fatigue Threshold (EMG(FT)) determined in the Vastus Lateralis (VL), Rectus Femoris (RF), Biceps Femoris (BF), Semitendinosus (ST) and Tibialis Anterior (TA) during stationary cycling in trained cyclists and non-cyclists. Using a cycle ergometer, 13 cyclists (28.4 +/- 6.9 y...
The aim of this study was to evaluate the effect of caffeine intake on critical power model parameters determined on a cycle ergometer. Eight male subjects participated in this study. A double-blind protocol consisting of the intake of pure caffeine (6 mg/kg) or placebo (maltodextrin) 60 min before testing was used. Subjects were submitted to four...
The present study examined the effects of acute ingestion of caffeine on the rate of increase of electromyographic signal (EMGslope), neuromuscular fatigue threshold (NFT), critical power (CP) and anaerobic work capacity (AWC). Eight males (25.7 ± 3.4 years; 82.0 ± 9.1kg; 180.2 ± 5.4cm) performed four constant-load bouts on a cycle ergometer until...
The aim of this study was to investigate the effect of 8 weeks of weight training and specific circuit on the motor performance of soccer players who were randomly assigned to a weight training group (WTG, n = 10) and a circuit training group (CTG; n = 10). Both groups underwent eight weeks of training, conducted in three weekly sessions of trainin...
The aim of this study was to investigate the influence of gender on the EMG signal of the muscles of the quadriceps femoris and the physical performance in high-intensity, short-term exercise. Fourteen volunteers (7 men = 29.1 +/- 2.8 years and 7 women = 22.6 +/- 2.9 years) performed a Wingate Test (WT) with a load of 7.5% of body mass. The variabl...
Aim. The present study focuses on the behavior of the abdominal muscles when performing curl-ups with loads gauged in relation to a maximum load test (1 RM). Methods. Thirteen subjects performed curl-up exercises with loads equivalent to 80, 60, 40 and 20% of the 1 RM (100%) maximum, with 5-minute rests between sets. Surface bipolar EMG electrodes...
The objective of this study is to verify the coincidence between the occurrence of the electromyographic fatigue threshold (EMGth) and the ventilatory threshold (Vth) in an incremental test in the cyclosimulator, as well as to compare the calculation of the RMS from the EMG signal using different time windows. Thirteen male cyclists (73.7 +/- 12.4...
The objective of this study was to compare the efficiency of pedaling (EP) and the electromyographic activity (EMG) between cyclists and non-cyclists during cycling in different cadences. Using a cyclosimulator, 12 cyclists (26.5 +/- 4.5 years; 68.2 +/- 10.5 kg; 175.6 +/- 8.2 cm) and 9 non-cyclists (25.1 +/- 4.3 years; 72.6 +/- 9.8 kg; 174.6 +/- 6....
The aim of this study was to describe by means of surface electromyography the activation of the rectus abdominis, obliquus externus and rectus femoris muscles during the "crunch" abdominal exercise performed with loads.
Thirteen subjects performed crunch exercises with loads representing 80, 60, 40 and 20% of the 1-RM (100%) in a random order with...
The purpose of this study was to analyze the behavior of the muscle strength and arm muscle area (AMA) during 24 weeks of weight training (WT) as well as establish possible associations between those variables. The sample was composed of 18 men between the ages of 18 and 30 years. The measures of relaxed arm circumference and skinfold measurement o...
The proposal of this study was to analyze the behavior of electromyographic activity of the Rectus Femoris, Vastus Lateralis and Vastus Medialis muscles during Maximum Isometric Voluntary Contraction (MIVC) performed before (MIVC-1) and after (MIVC-2) the series of repeated effort (four series of 12 repetitions) of the movement of extending the kne...
Sums of fading envelopes arise in several wireless communications applications, such as equal-gain combining, outage probability, signal detection, etc. In this paper, based on the intricate task of evaluating the exact statistics of such sums, accurate approximations for the outage probability of equal-gain receivers subject to arbitrary independe...
http://dx.doi.org/10.5007/1980-0037.2008v10n4p379
The purpose of this study was to analyze the behavior of muscle strength and arm muscle area (AMA) over 24 weeks of weight training (WT) as well as to establish possible associations between these variables. The sample was composed of 18 men aged between 18 and 30 years. Measurements of relaxed arm...
ALTIMARI, L. R.; FONTES, E. B.; OKANO, A. H.; TRIANA, R. O.; CHACON-MIKAHIL, M. P. T.; MORAES, A. C. The caffeine ingestion increases time to neuromuscular fatigue and performance during supramaximal cycling exercise. Brazilian Journal of Biomotricity, v. 2, n. 3, p. 195-203, 2008.The purpose of this study was to investigate the effect of the caffe...
ALTIMARI, L. R.; DIAS, R. M. R.; GOULART, L. F.; AVELAR, A.; ALTIMARI, J. M.; MORAES, A. C. Comparison of the effects of four weeks of strength and specific circuit training on performance in intermittent run and strength of young soccer players. Brazilian Journal of Biomotricity, v. 2, n. 2, p. 132-142, 2008. The objective of this study was to inv...
ALTIMARI, L. R.; FONTES, E. B.; OKANO, A. H.; TRIANA, R. O.; CHACON-MIKAHIL, M. P. T.; MORAES, A. C. The caffeine ingestion increases time to neuromuscular fatigue and performance during supramaximal cycling exercise. Brazilian Journal of Biomotricity, v. 2, n. 3, p. 195-203, 2008.The purpose of this study was to investigate the effect of the caffe...
The objective of the present study was to analyze the articulate torque (TO) and the electromyographic activity (EMG) of soccer athlete's long head Biceps Femoris (BF) and Semitendinosus (ST) muscles during isokinetic knee flexion movements (concentric-CON and eccentric-ECC actions) at differing velocities, carried out in the ventral decubitus posi...
The aim of the present study was to verify the influence of two linear models in the determination of critical power (CP) and anaerobic work capacity (AWC), in arm ergometer in athletes of canoeing. Eight athletes of canoeing, men (17.1 ± 1.1 years; 63.3 ± 6.5 kg; 173.4 ± 4.3 cm), had participated voluntariamente of this study. The CP and the AWC t...
The objective of the present study was to investigate the influence of two linear models on the determination of critical potential (CP) and anaerobic work capacity (AnWC) of canoeists evaluated on an arm ergometer. Eight male canoeists (17.1 ± 1.1 years; 63.3 ± 6.5 kg; 173.4 ± 4.3 cm) volunteered to take part in the study. Two different linear equ...
The aim of the present study was to determine the ventilation/perfusion ratio that contributes to hypoxemia in pulmonary embolism by analyzing blood gases and volumetric capnography in a model of experimental acute pulmonary embolism. Pulmonary embolization with autologous blood clots was induced in seven pigs weighing 24.00 +/- 0.6 kg, anesthetize...
The aim of the present study was to determine the ventilation/perfusion ratio that contributes to hypoxemia in pulmonary embolism by analyzing blood gases and volumetric capnography in a model of experimental acute pulmonary embolism. Pulmonary embolization with autologous blood clots was induced in seven pigs weighing 24.00 ± 0.6 kg, anesthetized...
