Eduardo Macedo Penna

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• PhD in Sports Sciences
• Professor (Full) at Federal University of Para

The negative effects of mental fatigue on physical performance have been well established in different sports that require aerobic endurance, but, in this study, we investigated the impact of mental fatigue on the physical performance of paralympic (wheelchair basketball) athletes. Eleven participants completed a baseline and two experimental sessi...

Introduction: Recovery dynamics in combat sports like judo are critical for optimizing performance and reducing injury risk. This study aimed to evaluate the time-course of physiological (creatine kinase, CK) and neuromuscular (countermovement jump, CMJ) recovery in junior judo athletes following competition. Methods: Thirteen junior-level judo ath...

We aimed verify if the SJFT baseline result could differentiate the rate of evolution of strength and power performance in high-level judo athletes in a half-season. 22 participants were divided into SJFT groups according to specific table. Strength and power were tested by one maximum repetition (1RM) of back squat, curved row, bench press and cou...

Introduction Injury is an inherent situation in the sports and recreational environment of physical exercise practices. Additionally, injured practitioners might present different motivational drives that may impair the continuity in physical exercise. However, little is known about the motivational profile of injured physical exercise practitioner...

Executive functioning (EF) in referees is associated with their decision‐making during a match and can be affected by mental fatigue (MF), a psychobiological state induced by prolonged periods of cognitive activity or high cognitive demand within a short timeframe. Therefore, the aim of this study was to investigate the impact of MF on EF and the p...

The proposition of a minimal dose of resistance training (RT) to elicit health benefits, encompassing physiological and psychological aspects, has garnered attention. While empirical investigations have demonstrated the efficacy of low-volume RT protocols in inducing adaptations such as enhanced strength and functional capacity, further exploration...

Guarana (GUA), a Brazilian seed extract, contains caffeine and other bioactive compounds that may have psychoactive effects. To assess the acute effects of GUA compared to a low dose of caffeine (CAF) on cognitive and mood parameters, twenty participants completed a double-blind, crossover experiment where they ingested capsules containing the foll...

This study aimed to investigate the impact of bar velocity during the eccentric phase on subsequent concentric performance in the young and elderly. Twelve elderly women (65.2+4.2 years) and 16 young women (23.1+2.1 years) were randomly assigned to four experimental conditions that combined high-velocity eccentric actions (HVECC; maximum velocity)...

There is a recent and growing interest in assessing differential responders to resistance training (RT) for diverse outcomes. Thus, the individual ability to respond to an intervention for a specific measurement, called responsiveness, remains to be better understood. Thus, the current study aimed to summarize the available information about the ef...

The aim of the study was to explore sources of organizational stress among Brazilian youth rhythmic gymnasts. Semi-structured interviews were conducted with six female athletes aged approximately 15 years (M = 14.50; SD = 1.76) with approximately seven years of experience in the sport on average (M = 6.83; SD = 3.25). Deductive categorical analysis...

Nosso objetivo foi investigar quais ferramentas de monitoramento da carga de treinamento são utilizadas por treinadores de esportes para pessoas com deficiência. Participaram 17 treinadores de diferentes modalidades esportivas que responderam a um questionário online contendo questões relacionadas a formação dos participantes, conceitos gerais e si...

Guarana seed extract, containing caffeine (CAF) with additional bioactive compounds, may positively affect mental performance, but evidence regarding exercise is limited. This investigation assessed acute Guarana (GUA) ingestion compared to CAF on endurance performance. Eleven endurance-trained non-cyclists and cyclists (VO2peak=49.7±5.9, 60.4±4.6...

The use of technology to approximate science to practice has been receiving attention, especially related to low-cost and portable devices. Thus, the present study aimed to investigate the validity and reproducibility of the Jumpo® application to measure vertical jump performance in older adults. 52 older women were invited to the survey. The evalu...

This study aims to elucidate the internal load, performance, physiological, and perceptual recovery responses during four weeks of traditional judo training. Ten cadet and junior judo athletes were evaluated daily for four weeks, in which their perception of recovery, heart rate variability, handgrip strength, and countermovement jump performance w...

Approach: CrossFit ® is a training program recognized for its rapid growth in popularity in competitive and noncompetitive models and designed to develop different fitness domains simultaneously. In this training model, chronic adaptations are expected to differ from other models due to the high-volume workloads, performed in a self-regulated chara...

We thank Dr. Gurney for his interest and comment [...]

The plant extract guarana is known for its caffeine content and other bioactive ingredients, which purportedly may improve cognitive performance. Recent reviews have examined the effects of chronic supplementation of guarana in clinical populations; however, the acute effects of guarana on cognitive tasks, while of interest, have produced mixed res...

In combat sports, strikes or counter-strikes response time (RT) can be related to performance and sporting success. Moreover, training sessions are usually highly fatiguing, which is expected to impair basic skills, such as RT. Thus, this study aimed to investigate the effect of fatigue on punches and kicks RT of karate practitioners. Twelve indivi...

Purpose The aim of the study was to compare the mood, motivation, and impulsivity of young athletes of different sexes and ages. Methods The sample consisted of 147 young student-athletes of both sexes, aged 12–17 years, participating in the regional stage of the Brazilian Youth School Games 2018. The individuals were categorized into 4 groups for...

We examined whether practice in an open skill video-game task would lead to changes in performance, attention, motivation, perceived effort, and theta, alpha, and beta waves. Specifically, we were interested on whether potential performance gains from practice would be primarily explained by the neural efficiency (i.e., cortical idling) or the neur...

International Journal of Exercise Science 15(4): 771-782, 2022. This study aimed to compare the effects of high-speed resistance training (HSRT) and low-speed resistance training (LSRT) in physical fitness, and functional performance in untrained older women. Twenty-four women (62.2 ± 2.7 years old) were allocated to the HSRT or LSRT groups. The HS...

The objective of this study was to analyze the effect of anodal transcranial direct current stimulation (a-tDCS) over the motion-sensitive midtemporal area on perceptual-cognitive skills (visuomotor and basketball decision-making skills) in mentally fatigued basketball players. A total of 20 male basketball players were recruited. This was a random...

Background. Kiai is a breathing technique, usually related to a short scream that aims to focus the martial artist's energy in a given attack. However, the influence of kiai in the technical and physical aspects related to striking performance needs more evidence. Thus, the purpose of this study was to investigate the effect of kiai in the performa...

Background The Wingate test is usually conducted using resistance loads of 7.5, 8.5 or 8.7 g.kg⁻¹ of body mass. However, these cycle ergometer resistance loads may be insufficient to enable maximal power values. As such, the use of individual optimal load selection (OPT) can positively influence other Wingate test parameters. Moreover, anthropometr...

Background: Mental fatigue is a psychobiological state caused by extended periods of cognitive effort, and evidence suggests that mentally fatigued athletes present impaired physical performance. Different ergogenic aids have been proposed to counteract the deleterious effects of mental fatigue, but whether brain stimulation can counteract mental f...

Objective: This investigation aimed to compare acute and delayed biochemical, hematological, and neuromuscular responses to the Rest-pause (RP) method and traditional resistance training (TRT) through 48 hours. Methods: This crossover design study, in which the training sessions were separated by a 7-days washout interval. Twelve recreationally tr...

ABSTRACT The objective of the present study was to describe the mood state, motivation and impulsiveness of students participating in youth school games and to compare these variables between sexes. The research was cross-sectional, and the sample was composed of 147 students aged 12 to 17 years old (14.53±1.51 years; 51.70% of male participants)....

Aim: The present study aimed to investigate the indicators of burnout, to determine whether playing position affects the perception of syndrome dimensions, and to identify burnout prevalence in professional football players. Methods: The participants were 100 professional football players (mean age 24.3 ± 4.6 years and meantime as a professional a...

O objetivo do estudo foi investigar se o tempo de prática como atleta federado afeta a percepção das dimensões de burnout em esportes de combate. A amostra foi composta por 36 atletas, todos do sexo masculino, praticantes de modalidades esportivas de combate. O instrumento utilizado foi o Questionário de Burnout para Atletas (QBA). Os dados foram a...

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Objective: To compare the effects of 12 weeks of traditional resistance training (TRT) or resistance training using Cluster-set (CS) on functional performance and physical fitness of postmenopausal and elderly women. Methods: Participants (61.1±4.9 years, body mass 64.5±1.8 kg, height 155.7±4.7 cm) were randomized to TRT (n= 35) or CS (n=31). Anth...

Aim: To compare two different randori structure (high volume and short pauses - TRAD training vs low volume with long pauses - COMP training) in the neuromuscular and metabolic responses of elite judo athletes. Methods: The first situation (TRAD) consisted of 12 randoris of 5 minutes with 45 seconds rest, and the other situation (COMP), consisted...

Purpose: High-intensity activity is an important aspect of football performance during competitive match play. The aim of this study was to investigate the effect of beta-alanine supplementation throughout a short-duration intense football-specific training period prior to an international competition on measures of high-intensity running performan...

Purpose: To compare the posttraining recovery timeline of elite Brazilian futsal athletes before (Pre-PS) and after 10 weeks of the preseason (Post-PS) period of high-intensity technical-tactical training. Methods: At the start (n = 13) and at the end of the preseason (n = 7), under-20 male futsal players undertook fitness testing for maximal ae...

Pacing strategy (PS) has a decisive impact on performance, especially on long-term races.The objective of this study is to characterize the PS used in swimming races of 800m and 1500m freestyle by the finalists of the Olympic trials of the United States, Europe and Brazil,and the Olympic finalists of 2016.Time partials of 63 athletes were analyzed...

Mentally fatigued athletes present impaired aerobic performance, strength endurance and manual dexterity, despite no changes in anaerobic performance and maximal muscle strength and power. Noteworthy, the effect of mental fatigue on physical performance during high-intensity intermittent tests that require specific motor skills of fighting sports h...

Resumo Analisar diferenças nas habilidades de coping entre os sexos e o potencial esportivo de alu-nos-atletas de um colégio militar. Trezentos e oitenta e cinco alunos-atletas responderam o ACSI-28BR. O potencial esportivo foi avaliado pelos treinadores, sendo classificado como baixo e alto. Os meninos apresentaram maiores habilidades de coping do...

Purpose: To determine whether daily perceived recovery is explained from a multifactorial single-session classification of recovery (ie, faster vs slower) or other circumstantial factors (ie, previous training load, self-reported sleep, or phase of the microcycle). Methods: Nineteen elite male futsal players were initially allocated to a recover...

We aimed to create a single subjective method to assess both internal training loads and subsequent fatigue. This new training-fatigue (dose-response) scale (TFS) was composed of two similar scales with the same properties, metrics and construction criteria. These two scales were designed to rate the perceived exertion (RPETFS) and perceived fatigu...

RESUMO O objetivo do estudo consiste em analisar se há correlação entre as seguintes variáveis em jogadores profissionais de futebol: a) dimensões de burnout x estratégia de coping; b) tempo de prática como atleta federado x dimensões de burnout; c) tempo de prática como atleta federado x estratégias de coping. Participaram do estudo 54 atletas pro...

Lidar com situações impostas em treinamentos e competições e saber administrá-las emocionalmente é essencial para que atletas apresentem um desempenho elevado. Estudos apontam que atletas resilientes apresentam a capacidade de enfrentar e interpretar positivamente situações adversas. Esta pesquisa tem como objetivo investigar a dinâmica do processo...

El objetivo del estudio consiste en investigar las siguientes correlaciones bivariadas en jugadores profesionales de fútbol: a) dimensiones de agotamiento x estrategia de afrontamiento; b) tiempo de práctica como atleta federado x dimensiones de agotamiento; c) tiempo de práctica como atleta federado x estrategias de afrontamiento. Participaron del...

Objectives: This study compared the activity profile of different types of soccer-specific training activity with the demands of competitive international female match-play. Methods: Twenty-one female players from the Brazilian National Soccer Team were monitored in twenty-two on-field training sessions during the 30-day preparatory training camp p...

This study aimed to compare anthropometric and physical fitness of Brazilian female National team soccer players from the U15 to senior categories, and to compare the physical performance between selected and non-selected players. Participants were 231 athletes (U15, n=46, U17, n=49, U20, n=98 and Senior, n=38). Body mass, height, sum of skinfolds,...

Dealing with situations imposed in training and competitions and knowing how to administer them emotionally is essential for athletes to present high performance. Studies point that resilient athletes have the ability to face and interpret adverse situations positively. This research aims to investigate the dynamics of the resilience process in pro...

Efeito da idade relativa (EIR) refere-se às consequências da diferença de idade cronológica entre indivíduos que são agrupados na mesma categoria etária. O objetivo foi investigar a presença do EIR em atletas Olímpicos de esportes de combate. Foi analisada a data de nascimento de 1.163 atletas de boxe, judô, luta olímpica e taekwondo que competiram...

Relative age effect (RAE) refers to the consequences of the chronological age difference between individuals who are grouped in the same age category. The objective was to investigate the presence of RAE in Olympic combat sports athletes. The birth date of 1,163 boxing, judo, wrestling and taekwondo athletes competing at 2012 Olympic Games and 1,14...

O objetivo do estudo foi caracterizar a percepção dos atletas de futebol para amputados em relação aos comportamentos dos seus treinadoresanalisar o perfil de comportamento de treinadores de futebol para amputados (FA) na percepção dos atletas. Participaram 43 atletas de futebol para amputados (média de idade 33,0±8,8 anos e tempo de experiência de...

Objectives: The aim of the present study was 1) compare the drop-out rates between athletes born in different trimesters of the competitive year from different sports and 2) identify the causes pointed by the dropped-out athletes born in different selection year trimesters to disengage from the competitive sports environment. Material and Methods:...

Background and Study Aim:

The relative age effect (RAE) refers to the advantage of the athletes born on the first months of the sport selection period compared to those born months later during such a selection process, which tends to favor athletes who are in a more developed maturational stage or those who have more advanced physical development compared to their younger...

Judo is a high-intensity intermittent combat sport which causes cardiac adaptations both morphologically and related to the autonomic nervous system (ANS). Therefore, this study aims to verify the correlation between heart rate variability (HRV) at rest with performance in the Specific Judo Fitness Test (SJFT) and whether groups with different R-R...

ABSTRACT: The action context of the football referee is associated to several conditions that can induce work stress, such as the need to maintain emotional control in the face of the lack of emotional control of coaches and athletes and little professional recognition. This overload scenario can expose these professionals to burnout syndrome. The...

Purpose: This study aimed to investigate the impact of mental fatigue on heart rate variability, subjective measures of fatigue, and swimming performance in young athletes. Methods: Sixteen swimmers [15.45 (0.51) y old, 7.35 (2.20) y of swimming experience] performed a 1500-m time trial on 2 occasions separated by an interval of at least 72 hour...

efeito da idade relativa (EIR) refere-se à vantagem de atletas nascidos nos primeiros meses do período de seleção em relação a seus pares nascidos em meses posteriores no processo de seleção esportivo, que tende a favorecer atletas que encontram-se em estágio maturacional ou de desenvolvimento físico mais avançados que o de seus colegas mais jovens...

The aim of this study was to determine the context of psychosocial development of soccer players for amputees. Participated 16 athletes, male, belonging to a soccer team for amputees with a mean age of 34.1 ± 8.9 years, total time of practice in the modality of 11.0 ± 7.9 years and who competing for national competitions and international. For data...

Introduction: This study involved an analysis of the impact of mental fatigue on heart rate recovery (HRR), subjective measures of fatigue and intermittent running performance in handball players. Objective: This study was aimed at (1) examining the effects of an induced state of mental fatigue on the aerobic performance of handball players, as me...

The aim of this study was to compare locomotor activity profiles of Brazilian top-class female soccer players competing at distinct age brackets (U17, U20, and Senior). External match load of 14 U17, 14 U20, and 17 Senior female soccer players competing in 6-7 full official international matches were assessed using global positioning systems (GPS)....

Apresentação em pôster

The relative age effect, which is the advantage obtained by an athlete born closer to the beginning of the selection year, has been shown to be an important variable in the development of soccer players. This study aimed to evaluate the influence of the season of birth on the choice reaction time (CRT) of elite soccer athletes in the under 13 years...

DOI: http://dx.doi.org/10.5007/1980-0037.2012v14n5p571 O Efeito da Idade Relativa que consiste na vantagem obtida pelo atleta nas­cido mais próximo ao início do ano de seleção, mostra-se uma variável importante para o desenvolvimento de talentos, particularmente, devido aos aspectos maturacionais. Objetivou-se analisar a distribuição das datas de n...

Relative age effects refer to the effects of age differences among individuals who have been grouped together for a performance activity. This study aimed to investigate the relative age effect on Olympic Taekwondo athletes, in several Olympic Games, and in both sexes. The study sample consisted of 291 athletes who had competed in Atlanta, Sydney,...

Expertise as a field is one that studies the authenticity of the expert, meaning the skill or knowledge level he or she has in a certain field, such as athletics. Different models, from the ambient perspective, judge factors that influence the development of the expert. The aim of this study was to verify the context in which Brazilian swimmers dev...

El efecto de la edad relativa, entendido como la ventaja obtenida por el atleta nacido em las primeras fechas del año de selección, se muestra una variable significativa para el desarrollo de talentos en distintas modalidades. Por esta se evaluó el cuartil de nacimiento de atletas de las categorias base del fútbol sala em Minas Gerais. La muestra e...

O objetivo principal deste trabalho é analisar o nível de conhecimentotático em atletas de handebol. Foram analisadas quarenta (40) atletas dequatro equipes de Handebol, de nível escolar, do sexo feminino. Foi utilizadocomo instrumento de pesquisa o teste de conhecimento tático no handebol.As avaliações constaram de dezessete (17) situações ofensiv...

The Relative Age Effect, which consists in the advantage obtained by an athlete born closer to the beginning of the year selection, is shown as an important variable for the development of talent, particularly due to maturational aspects. The objective of this study was to analyze the distribution of the birth dates of the soccer players participat...

Considerado como a principal modalidade esportiva do país, o futebol pode ser praticado por pessoas de todas as idades e níveis sociais. Sua prática voluntária e plurianual é constituída de diferentes fases de desenvolvimento durante a carreira dos atletas. Essas fases apresentam características específicas em relação às interferências existentes e...

The aim was to identify the main factors that create stress in soccer referees. The method used to evaluate the officials was the TEPA, which, in this case, consisted of 102 officials of both genders in the state of Minas Gerais. Data analysis included descriptive statistics, inferential (Wilcoxon test) TEPA and internal consistency through Cronbac...

O Efeito da Idade Relativa, que consiste na vantagem obtida pelo atleta nascido mais próximo ao início do ano de seleção, tem se mostrado uma variável importante para o desenvolvimento de talentos em diversas modalidades, especialmente aquelas que possuem sua estruturação na divisão das categorias em grupos etários. Logo o objetivo deste estudo foi...

Resumo O objetivo foi identificar os principais fatores causadores de estresse em árbitros de futebol de campo. Foram avaliados 102 árbitros federados de ambos os gêneros do estado de Minas Gerais, para isso, utilizou-se o TEPA. A análise dos dados foi composta por Estatística Descritiva, teste inferencial de Wilcoxon e consistência interna do TEPA...

The Relative Age Effect, which is the advantage gained by those born early in the selection year, is shown to be a factor which influences the development of a talent in several sports, which in its structure has the division of categories into age groups. The aim of the present study is to assess and identify the quartiles in professional players...

The categorization of the time of birth (quartiles) is shown to be a factor which influences the development of a talent in soccer, which in its structure has the division of categories into age groups. The aim of the present study is to assess and identify the quartiles of birth in professional players at different levels: the Brazilian National C...