Paulo Marchetti
California State University, Northridge, Kinesiology, Faculty Member
The purpose of the present study was to investigate the effect of two recovery periods between consecutive and non-consecutive days in strength training sessions on hormonal, neuromuscular and morphological variables in recreationally... more
The purpose of the present study was to investigate the effect of two recovery periods between consecutive and non-consecutive days in strength training sessions on hormonal, neuromuscular and morphological variables in recreationally trained men. Nineteen young men completed the study and were randomly divided into two groups: 24R, 24-hour recovery group (n = nine) and 72R, 72-hour recovery group (n = ten). The strength training program (RT) lasted six weeks with two serial routines, with a weekly frequency of four times. The saliva sample was collected once a week in the morning to determine salivary testosterone. The 1RM, jump against movement and body composition tests were performed in the pre- and post-training periods. As for salivary testosterone, there was no significant effect with respect to time and between groups. Both groups improved maximal strength in terms of intervention time in the barbell bench press and in the leg press 45º, not differing between groups and body...
Research Interests: Morning and Bench Press
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The training combined force restriction of blood flow also known as KAATSU training, training is a method developed for the purpose of increasing muscle mass and strength with the use of low intensity exercising. Therefore, the aim of... more
The training combined force restriction of blood flow also known as KAATSU training, training is a method developed for the purpose of increasing muscle mass and strength with the use of low intensity exercising. Therefore, the aim of this study was a brief scientific literature review on the effects of strength training associated with blood flow restriction with low intensity of neuromuscular performance. Were selected from the national and international papers, those published between 2000 and 2014. The training method with blood flow restriction seems to affect the performance of muscular strength and hypertrophy observed in most studies, this method being performed most commonly with a pressure ranging from 110 to 160 mmHg and intensities between 20% and 30% 1RM concentric. Thus, strength training protocols with restriction of blood flow of the subjects may influence the neuromuscular performance.
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Supervised resistance training may affect several acute variables such as volume load (VL), the maximum number of repetitions (NRM), time under tension (TUT), and rate of perceived exertion (RPE) in resistance trained-men. The present... more
Supervised resistance training may affect several acute variables such as volume load (VL), the maximum number of repetitions (NRM), time under tension (TUT), and rate of perceived exertion (RPE) in resistance trained-men. The present study aimed to evaluate the influence of the personal trainer’s supervision on a resistance training session in resistance trained-men. Fifteen resistance-trained men (20,0±2 years; 176,0±4 cm; 79,3±4,7 kg) performed two training sessions composed of whole-body exercises. In the session without personal trainer’s supervision (NPT) the subjects self-selected their loads for each exercise and were oriented to “select a load typically employed to perform 10 repetitions”; in the session with personal trainer’s supervision (WPT) the subjects self-selected their loads for each exercise and were oriented to “perform maximum effort”. It was observed greater VL (P<0,001, Δ%=30), NRM (P<0,001, Δ%=29), TUT (P=0,003, Δ%=21), and RPE (P<0,001, Δ%=29) in th...
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A fadiga pode ser definida como uma reducao progressiva da eficiencia muscular em produzir forca e potencia por periodos prolongados, ocorrendo de forma periferica e/ou central. Diversos mecanismos e sistemas podem afetar a fadiga sendo... more
A fadiga pode ser definida como uma reducao progressiva da eficiencia muscular em produzir forca e potencia por periodos prolongados, ocorrendo de forma periferica e/ou central. Diversos mecanismos e sistemas podem afetar a fadiga sendo esta considerada multifatorial. A fadiga pode acometer diferentes locais atraves de variados mecanismos, levando a reducao do desempenho na atividade alvo, ou em atividades subsequentes. Curiosamente, o processo de fadiga pode envolver tanto o membro fadigado (fadiga local) como o membro nao fadigado (fadiga nao local). Sendo assim, o objetivo do presente estudo foi realizar uma breve revisao de literatura sobre os efeitos de diferentes protocolos de fadiga neuromuscular local e nao local no desempenho fisico. Apesar de verificar inumeros mecanismos relacionados a fadiga neuromuscular, fatores como o tipo de fibra muscular, o genero, o protocolo experimental utilizado e o nivel de condicionamento fisico dos sujeitos avaliados podem influenciar nos ef...
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The range of motion (ROM) may affect the external maximal load during back squat (BS) exercise. The correct ROM manipulation can be useful as an exercise load manipulation strategy, changing the volume load during a resistance training... more
The range of motion (ROM) may affect the external maximal load during back squat (BS) exercise. The correct ROM manipulation can be useful as an exercise load manipulation strategy, changing the volume load during a resistance training session. The aim of this study was to evaluate the acute effects of ROM on relative load, absolute load and the rating of perceived exertion (RPE) during partial and full BS exercise with adjusted loads. Fifteen male individuals (age: 26.5±4.5 years; height: 173±6 cm; body mass: 80.6 ± 8.8 kg; resistance training experience 5±3 years) participated in this study. The experimental procedure was conducted in two sessions. In the first session, brief familiarization and a 10-repetition maximal test (10-RM) was performed for partial (PBS) and full BS exercise (FBS) with 30-min of rest interval. During the second session, all subjects performed 1 set of 10-RM in both conditions (partial and full ROM), and relative load, absolute load, and RPE were evaluated...
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Introduction: The elastic wrap is widely used by different types of athletes and recreational practitioners of strength training in order to improve weightlifting performance. Objective: The objective was to investigate the acute effects... more
Introduction: The elastic wrap is widely used by different types of athletes and recreational practitioners of strength training in order to improve weightlifting performance. Objective: The objective was to investigate the acute effects of elbow wrap on strength performance, absolute volume, and rating of perceived exertion/discomfort during the bench press (BP) exercise. Methods: The experimental protocol was divided into three laboratory sessions. At the first session, a bench press familiarization phase was performed with (EW) and without (WEW) elastic elbow wrap. During the second session, the 1RM test was carried out in the bench press exercise under both EW and WEW conditions. At the third session, the repetition maximum (RM) test at 70% of 1RM (EW and WEW) was performed until concentric failure. After each session, subjects were consulted about their rate of perceived exertion (RPE), and discomfort (PSD). A paired student t-test was used to compare the values of 1RM and RMs ...
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Brigatto, FA, Braz, TV, Zanini, TCdC, Germano, MD, Aoki, MS, Schoenfeld, BJ, Marchetti, PH, and Lopes, CR. Effect of resistance training frequency on neuromuscular performance and muscle morphology after 8 weeks in trained men. J Strength... more
Brigatto, FA, Braz, TV, Zanini, TCdC, Germano, MD, Aoki, MS, Schoenfeld, BJ, Marchetti, PH, and Lopes, CR. Effect of resistance training frequency on neuromuscular performance and muscle morphology after 8 weeks in trained men. J Strength Cond Res 33(8): 2104–2116, 2019—The purpose of this study was to investigate the chronic effects of training muscle groups 1 day per week vs. 2 days per week on neuromuscular performance and morphological adaptations in trained men with the number of sets per muscle group equated between conditions. Participants were randomly assigned in 2 experimental groups: 1 session·wk−1 per muscle group (G1, n = 10), where every muscle group was trained once a week with 16 sets or 2 sessions·wk−1 per muscle group (G2, n = 10), where every muscle group was trained twice a week with 8 sets per session. All other variables were held constant over the 8-week study period. No significant difference between conditions for maximal strength in the back squat or bench ...
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Zaroni, RS, Brigatto, FA, Schoenfeld, BJ, Braz, TV, Benvenutti, JC, Germano, MD, Marchetti, PH, Aoki, MS, and Lopes, CR. High resistance-training frequency enhances muscle thickness in resistance-trained men. J Strength Cond Res 33(7S):... more
Zaroni, RS, Brigatto, FA, Schoenfeld, BJ, Braz, TV, Benvenutti, JC, Germano, MD, Marchetti, PH, Aoki, MS, and Lopes, CR. High resistance-training frequency enhances muscle thickness in resistance-trained men. J Strength Cond Res 33(7S): S140–S151, 2019—The purpose of this study was to compare the effect a split training routine with muscle groups trained once per week (SPLIT) vs. whole-body split training routine with muscle groups trained 5 days per week (TOTAL) on neuromuscular adaptations in well-trained men. Eighteen healthy men (height = 177.8 ± 6.6 cm; total body mass = 84.4 ± 8.1 kg; age = 26.4 ± 4.6 years) were recruited to participate in this study. The experimental groups were matched according to baseline strength and then randomly assigned to 1 of the 2 experimental groups: SPLIT (n = 9) or TOTAL (n = 9). Prestudy and poststudy testing included 1RM for bench press, parallel back-squat and machine close-grip seated row, as well as an ultrasound analysis of the muscle thic...
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In-line and traditional lunge exercises present differences in technique as lower limb positioning (anterioposterior), and medio-lateral (ML) balance may differentially affect primary and stabilizer muscles. The purposes of this study... more
In-line and traditional lunge exercises present differences in technique as lower limb positioning (anterioposterior), and medio-lateral (ML) balance may differentially affect primary and stabilizer muscles. The purposes of this study were to examine ML balance and muscle activation in anterior and posterior leg positions between in-line and traditional lunge exercises. Fifteen young, healthy, resistance-trained men (25 ± 5 years) performed 2 different lunge exercises (in-line and traditional) at their 10 repetition maximum in a randomized, counterbalanced fashion. Surface electromyography measured muscle activation of the vastus lateralis, biceps femoris, gluteus maximus, and gluteus medius. ML balance was measured with a Wii Fit Balance Board. The vastus lateralis activity was not significantly different between exercises or leg positions. The biceps femoris activity was not significantly different between exercises, however, it was significantly greater in the anterior compared t...
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The purpose of this study was to compare muscle activation of the lower limb muscles when performing a maximal isometric back squat exercise over three different positions. Fifteen young, healthy, resistance-trained men performed an... more
The purpose of this study was to compare muscle activation of the lower limb muscles when performing a maximal isometric back squat exercise over three different positions. Fifteen young, healthy, resistance-trained men performed an isometric back squat at three knee joint angles (20°, 90°, and 140°) in a randomized, counterbalanced fashion. Surface electromyography was used to measure muscle activation of the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), semitendinosus (ST), and gluteus maximus (GM). In general, muscle activity was the highest at 90° for the three quadriceps muscles, yet differences in muscle activation between knee angles were muscle specific. Activity of the GM was significantly greater at 20° and 90° compared to 140°. The BF and ST displayed similar activation at all joint angles. In conclusion, knee position alters muscles activation of the quadriceps and gluteus maximus muscles. An isometric back squat at 90° generates ...
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The purpose of this study was to measure the acute effects of pre-exhaustion vs. traditional exercise order on neuromuscular performance and sEMG in trained men. Fourteen young, healthy, resistance trained men (age: 25.5 ± 4.0 years,... more
The purpose of this study was to measure the acute effects of pre-exhaustion vs. traditional exercise order on neuromuscular performance and sEMG in trained men. Fourteen young, healthy, resistance trained men (age: 25.5 ± 4.0 years, height: 174.9 ± 4.1 cm, and total body mass: 80.0 ± 11.1 kg) took part of this study. All tests were randomized and counterbalanced for all subjects and experimental conditions. Volunteers attended one session in the laboratory. First, they performed ten repetition maximum (10RM) tests for each exercise (bench press and triceps pushdown) separately. Secondly, they performed all three conditions at 10RM: pre-test (bench press and triceps pushdown, separately), pre-exhaustion (triceps pushdown+bench press, PE) and traditional (bench press+triceps pushdown, TR), and rested 30 minutes between conditions. Results showed that pre-test was significantly greater than PE (p = 0.031) but not different than TR, for total volume load lifted. There was a significant...
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RESUMO Introdução: Diferentes ordens no sequenciamento dos exercícios na musculação podem afetar o desempenho neuromuscular. Objetivo: Investigar o efeito da ordem dos exercícios de musculação (pré-exaustão, (PE) e tradicional, (TR) sobre... more
RESUMO Introdução: Diferentes ordens no sequenciamento dos exercícios na musculação podem afetar o desempenho neuromuscular. Objetivo: Investigar o efeito da ordem dos exercícios de musculação (pré-exaustão, (PE) e tradicional, (TR) sobre o desempenho e atividade muscular de peitoral maior (PM) e tríceps braquial (TB) durante a realização dos exercícios de supino reto (SR) e tríceps na polia (TP). Métodos: A amostra foi composta de 14 homens treinados (idade: 25±4 anos, estatura: 175±4 cm, massa: 80±11 kg). O experimento foi conduzido em duas sessões. Na primeira, foi realizada a familiarização e determinação de 10 repetições máximas (RM) nos exercícios SR e TP. A segunda foi dividida em duas fases. A primeira fase avaliou o desempenho dos exercícios isoladamente, considerado o controle (CON). A segunda fase, avaliou duas diferentes ordens de exercícios: pré-exaustão, PE (TP e SR) e tradicional, TRAD (SR e TP). Foram avaliados o desempenho e a atividade muscular do PM e TB. One-wayA...
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INTRODUÇÃO: A banda elástica pode afetar o desempenho durante exercícios de alta intensidade, reduzindo a ativação muscular, o que pode influenciar o efeito de potencialização pós-ativação, que depende de alta intensidade para o exercício... more
INTRODUÇÃO: A banda elástica pode afetar o desempenho durante exercícios de alta intensidade, reduzindo a ativação muscular, o que pode influenciar o efeito de potencialização pós-ativação, que depende de alta intensidade para o exercício subsequente que visa potência. Objetivo: Verificar os efeitos agudos no desempenho do salto com contramovimento (SCM) após o agachamento em alta intensidade com e sem o uso da banda elástica de joelhos em sujeitos treinados em força.MÉTODOS: Participaram do estudo 14 homens (idade: 24 ± 4 anos, estatura: 176 ± 6 cm, massa corporal: 81 ± 11 kg, 1RM: 107 ± 30 kgf), treinados em força (>3 anos). Foram realizados três SCM antes e após três meio-agachamentos a 90% de 1RM nas condições com e sem a banda elástica de joelhos. Durante o SCM foram avaliados ativação muscular (IEMG) do vasto lateral (VL), glúteo máximo (GM), tempo de salto (TS) e impulso (IMP) por meio da força vertical de reação do solo (FRSv).RESULTADOS: Os resultados mostraram que para ...
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The purpose of this study was to evaluate the acute effects of static-stretching (SS) session with (intermittent) and without (continuous) rest intervals between sets on the bounce drop jump performance, with the same volume and... more
The purpose of this study was to evaluate the acute effects of static-stretching (SS) session with (intermittent) and without (continuous) rest intervals between sets on the bounce drop jump performance, with the same volume and intensity. The experimental protocol consisted of (1) a brief warm-up using sub-maximal jumps; (2) a preSS evaluation (passive ankle ROM and three trials of maximal single-leg jumping task for each lower limb); (3) ankle plantar flexors SS protocol (intermittent or continuous) was used only for a single-lower limb; (4) immediate post-SS evaluation (passive ankle ROM and three trials of maximal single-leg jumping task for the stretched lower limb). Then, subjects rest for 30 minutes and the topics 3-4 were repeated with the other lower limb and stretching protocol. The intensity used for both stretching protocols was between 70-90% of the point of discomfort. There were significant decrease in jumping height performance for both stretching protocols: continuo...
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The purpose of the present study was to evaluate the acute effects of an upper limb static-stretching (SS) protocol on the maximal concentric jump performance. We recruited 25 young healthy, male, resistance trained individuals (stretched... more
The purpose of the present study was to evaluate the acute effects of an upper limb static-stretching (SS) protocol on the maximal concentric jump performance. We recruited 25 young healthy, male, resistance trained individuals (stretched group, n = 15 and control group, n = 10) in this study. The randomized between group experimental protocol consisted of a three trials of maximal concentric jump task, before and after a SS of the upper limb. Vertical ground reaction forces (vGRF) and surface electromyography (sEMG) of both gastrocnemius lateralis (GL) and vastus lateralis (VL) were acquired. An extensive SS was employed consisting of ten stretches of 30 seconds, with 15 seconds of rest, and 70-90% of the point of discomfort (POD). ANOVA (2x2) (group x condition) was used for shoulder joint range of motion (ROM), vGRF and sEMG. A significant interaction for passive ROM of the shoulder joint revealed significant increases between pre- and post-SS protocol (p < 0.001). A significa...
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The purpose of this study was to compare the number of maximum repetitions (RMs) performed at 80% of one-repetition maximum (1RM) and 80% of one-repetition maximum eccentric (1RMecc) test for the preacher-curl (PC) and the bench-press... more
The purpose of this study was to compare the number of maximum repetitions (RMs) performed at 80% of one-repetition maximum (1RM) and 80% of one-repetition maximum eccentric (1RMecc) test for the preacher-curl (PC) and the bench-press (BP) exercises. Fifteen resistance-trained men participated in this counterbalanced-crossover study. There was no significant difference in the number of RMs performed at 80%-1RM (PC: 7.0±1.2 RMs and BP: 5.8±1.3 RMs) and 80%-1RMecc (PC: 6.0±1.1 RMs and BP: 5.4±1.1 RMs) for both exercises. No significant difference in the numbers of RMs was detected between the PC (80%-1RM: 7.0±1.2 RMs and 80%-1RMecc: 6.0±1.1 RMs) and BP exercises (80%-1RM: 5.8±1.3 RMs and 80%-1RMecc: 5.4±1.1 RMs) for both intensities. In conclusion, the number of RMs performed by resistance-trained men was not affected by the maximum load intensity based on muscle action and the exercise selection.
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Introdução: Apesar do aquecimento ser considerado essencial na prática dos esportes, pouco se conhece sobre seu efeito no treinamento de força.Objetivo: Avaliar o efeito de diferentes estratégias de aquecimento no desempenho neuromuscular... more
Introdução: Apesar do aquecimento ser considerado essencial na prática dos esportes, pouco se conhece sobre seu efeito no treinamento de força.Objetivo: Avaliar o efeito de diferentes estratégias de aquecimento no desempenho neuromuscular em adultos jovens submetidos a testes de repetições máximas de membro superior e inferior.Métodos: Dois experimentos foram realizados separadamente. Para o primeiro experimento, 16 adultos jovens hígidos realizaram um teste de repetições máximas a 70% de 1RM no supino reto (previamente determinado). Quatro condições de aquecimento foram testadas: Controle (CON) sem aquecimento prévio, esteira (EST) 5' a 60% VO2max, resistência de força (REF) 15 repetições com 40% de 1RM e força máxima (FM) duas séries de duas repetições com 90% de 1RM. Para o segundo experimento, 14 adultos jovens hígidos, realizaram um teste de repetições máximas a 70% de 1RM no leg press unilateral (previamente determinado). Cinco condições de aquecimento foram testadas: cont...
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INTRODUÇÃO: Recentemente, a prática de exercícios de alongamento tem sido relacionada a déficit no desempenho de atividades força-dependentes. Entretanto, pouco se sabe sobre seu efeito ao longo de séries múltiplas no treinamento de... more
INTRODUÇÃO: Recentemente, a prática de exercícios de alongamento tem sido relacionada a déficit no desempenho de atividades força-dependentes. Entretanto, pouco se sabe sobre seu efeito ao longo de séries múltiplas no treinamento de força. OBJETIVO: Determinar o efeito do alongamento passivo extensivo no desempenho de séries múltiplas e da dor percebida no treinamento de força. MÉTODOS: A amostra foi composta de 12 homens experientes com treinamento de força. O protocolo consistiu de três sessões. A primeira serviu como familiarização e determinação de 10 repetições máximas no supino reto (T10RM). A segunda e terceira condições foram aleatorizadas entre os sujeitos, sendo uma realizada com a avaliação do supino reto (SR) sem alongamento prévio (SEMA), e a outra com alongamento prévio (COMA). O protocolo de alongamento consistiu de seis séries de 45 seg de alongamento por 15 seg de intervalo visando o músculo peitoral maior. A intensidade do alongamento foi mantida entre 70 e 90% da ...