PAULO HENRIQUE MARCHETTI
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- ALONGAMENTO INTERMITENTE E CONTÍNUO AUMENTAM A AMPLITUDE DE MOVIMENTO E REDUZEM A FORÇA DOS FLEXORES DE PUNHO(2015) MARCHETTI, Paulo Henrique; MATTOS, Viviane de Jesus P.; SERPA, Erica Paes; SILVA, Josinaldo Jarbas da; SOARES, Enrico Gori; PAULODETO, Antonio Claudio; CORREA, Daniel Alves; VILELA JUNIOR, Guanis de Barros; GOMES, Willy AndradeIntroduction: The management of rest interval among series can influence the performance of subsequent activities. Objective: To compare the effect of rest intervals during continuous and intermittent static stretching upon wrist flexor performance. Methods: The sample comprised 14 young, healthy male adults, (age: 31 +/- 9 years, height: 178 +/- 0.7 cm, weight: 85 +/- 12kg). Evaluation was carried out of the passive range of motion (PROM) in wrist extension, the maximum isometric strength of wrist flexion associated with surface electromyography before and after two stretching protocols with different intervals among series. For each subject, one of the upper limbs was stretched with the continuous protocol (CON) and the other with the intermittent (INT) protocol, randomly. As regards CON, it consisted in stretching during six uninterrupted minutes, whereas INT consisted in stretching six series of 1 minute for 20 seconds of rest interval among series. The intensity was kept at 70-90% of the subjective perception of discomfort. Results: The results of PROM showed significant increase between pre and post-intervention conditions, in both protocols INT (81 degrees +/- 10 and 94 degrees +/- 10, P< 0.001) and CON (87 degrees +/- 12 and 96 degrees +/- 11, P= 0.004). The results for peak force showed significant reduction in post-intervention conditions for both protocols: INT (205 +/- 54 Kgf and 148 +/- 56 Kgf, P< 0.001) and CON (211 +/- 39 Kg and 144 +/- 36 Kgf, P< 0.001). The results for the rate of force development showed significant increase in pre and post-intervention conditions for both protocols INT (0.52 +/- 0.29 Kgf/ms and 1.24 +/- 0.45 Kgf/ms, P< 0.001) and CON (0.43 +/- 0.29 Kgf/ms and 1.11 +/- 0.34 Kgf/ms, P< 0.001). Conclusion: Both protocols increased the passive range of motion, reduced the peak force and the rate of force development, without changes in the activation of wrist flexors.
- DIFFERENT WARM-UPS ON THE MAXIMUM REPETITION PERFORMANCE IN RESISTANCE TRAINING(2014) LUZ JUNIOR, Danilo Atanazio da; JUNOR, Aylton Figueira; SERPA, Erica Paes; GOMES, Willy Andrade; SOARES, Enrico Gori; LOPES, Charles Ricardo; TEIXEIRA, Luis Felipe Milano; MARCHETTI, Paulo HenriqueIntroduction: Although the warm-up is considered essential for sports, little is known about its effect on strength training. Objective: To evaluate the effect of different warm-up strategies in neuromuscular performance in young adults undergoing maximum repetitions of upper and lower limb exercises. Methods: Two experiments were conducted separately. For the first experiment, 16 healthy young adults performed a test of maximal repetitions at 70% 1RM in the bench press (previously determined). Four warm-up conditions were tested: control (CON) without prior warm-up, 5 min on the treadmill at 60% VO2max (EST), strength endurance (REF) with 1 set x 15 repetitions with 40% 1RM and maximal strength (MS) with two sets of two reps with 90% 1RM. For the second experiment, 14 healthy young adults performed a maximal number of repetitions at 70% 1RM in the unilateral leg press (previously determined). Five warm-up conditions were tested: control (CON) without prior warm-up, 5 min of cycling at 60% VO2max (BIC), 5 min on the treadmill to 60% VO2max (EST), strength endurance (REF) with 1 set vs. 15 repetitions with 40% 1RM and maximal strength (MS) with two sets of two reps with 90% 1RM. For both experiments the number of repetitions performed and perceived exertion were evaluated. Results: For the first experiment, the MS condition was superior when compared to other protocols. No differences between the other conditions were observed. For the second experiment differences between all protocols were observed, except CON and EST, being MS> BIC> REF> = CON. Conclusion: The results of this study suggest that a warming-up of maximum strength may produce higher force production for the upper and lower limbs. Additionally, aerobic and strength resistance warm-up showed an improvement in strength performance for the lower limbs in a smaller magnitude.
- Efeitos do alongamento passivo no desempenho de séries múltiplas no treinamento de força(2015) LOPES, Charles Ricardo; SOARES, Enrico Gori; SANTOS, Andre Luis Rodrigues; AOKI, Marcelo Saldanha; MARCHETTI, Paulo HenriqueIntroduction: Stretching exercises have been related to a performance deficit on strength-dependent activities. However, little is known about its effect on multiple sets of strength training. Objective: To determine the effect of an extensive stretching protocol on the performance of multiple sets and soreness in strength training. Methods: The sample was composed by 12 trained-men, experienced in strength training. The protocol consisted of three sessions. The first session was used as a familiarization and load determination to 10 maximum repetitions (T10RM). The second and third conditions were randomized between subjects, and the bench press exercise (BP) was evaluated without previous stretching protocol (SEMA), and with previous stretching protocol (COMA). The stretching protocol consisted of six sets of 45 sec of stretch with 15 sec of resting intervals to the pectoralis major muscle. The stretching intensity was kept between 70 and 90% of the subjective point of discomfort. The local soreness was evaluated before and after exercise by a brief stretching and palpation. The Analysis of Variance ANOVA (2x6) was used to compare the maximum number of repetitions. One-way ANOVA was used to compare the load of the first set of each condition (T10RM/SEMA/COMA). The Student t-test was used to compare the total load and soreness. Results: A decrease on maximum number of repetitions along the sets was observed in both conditions, without differences between them, for the load of the first set, total load and soreness. Conclusion: The number of repetitions in multiple sets was reduced in the same magnitude in the conditions with and without previous stretching; besides, it does not alter the total load or soreness.
- Efeitos agudos no desempenho do salto vertical após o agachamento com banda elástica de joelho(2015) GOMES, Willy Andrade; SILVA, Josinaldo Jarbas da; SOARES, Enrico Gori; SERPA, Erica Paes; CORRêA, Daniel Alves; VILELA JUNIOR, Guanis de Barros; LOPES, Charles Ricardo; MARCHETTI, Paulo HenriqueINTRODUCTION: Knee wraps can affect the muscular performance during high-intensity exercises by reducing muscle activation, which may influence the effect of post-activation potentiation, which depends on high intensity for the following power exercise. Objective: To investigate the acute effects on the performance with counter-movement jump (CMJ) after high-intensity squat with and without the use of knee wraps in resistance trained subjects.METHODS: The study included 14 men (aged 24±4 years, height: 176±6cm, weight: 81±11kg, 1RM: 107±30kgf) resistance trained (>3 years). Three SCM were performed before and after three back squats at 90% of 1RM with and without the knee wraps. During the CMJ muscle activation (IEMG) of the vastus lateralis (VL) and gluteus maximus (GM), jump time (JT), and impulse (IMP) through the force of vertical ground reaction (FRSV) were evaluated.RESULTS: The results show statistically significant differences for JT between post-back-squat conditions (with and without wrap) (P=0.044, TE=1.02), whereas the highest values were observed without knee wrap. For IEMG of VL significant difference between pre and post-conditions after back squat (with knee wrap) (P=0.029, TE=1.68) was observed, and the highest values were observed for the IEMG with knee wrap. No significant differences between conditions were observed for IEMG of GM and IMP.CONCLUSION: After using the knee wraps during the squat exercise, there was a reduction in the involvement of the vastus lateralis during the jump with counter-movement, affecting the contact time, but not the production of impulse and consequent performance.
- Técnicas de aterrissagem afetam o desempenho e estresse mecânico durante Drop Jump(2017) MARCHETTI, Paulo Henrique; SANTOS, Thaís Tomaz dos; SOARES, Enrico Gori; SERPA, Erica Paes; SILVA, Josinaldo Jarbas da; MAGALHÃES, Roberto Aparecido; MIYATAKE, Marcelo Massatoshi Senaga; VILELA JUNIOR, Guanis de Barros; GOMES, Willy AndradeABSTRACT Introduction: The drop jump is used to improve the power of the lower limbs. Keeping the drop height constant, the variation of the landing technique can modify the performance and the mechanical characteristics of the jump. Objective: To evaluate the effects of different landing techniques on the performance and the reaction force of the vertical component of the ground after drop jump. Methods: Twenty-five healthy and physically active men (age: 26±8 years, total body mass: 75±10 kg, height: 175±10 cm) performed four landing techniques after the drop jump: bounce drop jump (BDJ), drop jump with 90° of knee flexion (DJ90), drop jump with 135° of knee flexion (DJ135), and drop jump with 135° of knee flexion with hands resting on the ground (DJ135A). Three attempts were performed for each technique; the subjects performed the drop jump falling from a 40 cm high force platform. The measures of jump height, contact time and impact were determined by the force of reaction of the vertical component of the ground, measured by the force platform, at a frequency of acquisition of 2,000 Hz. The repeated measures by ANOVA were used to compare the different techniques. Results: The BDJ technique presented lower jump height, shorter contact time and greater impact than the other techniques (P<0.001). The DJ90 technique presented jump height similar to the DJ135 and DJ135A techniques and a short contact time (P<0.001) and a lower impact than the other techniques (P<0.001). Conclusion: The highest jumps were observed for DJ90, DJ135 and DJ135A. The lowest contact time was observed in the BDJ technique, followed by DJ90. Regarding the impact, the BDJ technique presented the highest values.