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  • Author: Rodrigo Gomes De Souza Vale x
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Ana Carolina Gago Raymundo, Carlos Soares Pernambuco, Rosana Dias de Oliveira Brum, Juliana Brandão Pinto de Castro, Flávio Boechat de Oliveira, Dirceu Ribeiro Nogueira da Gama, Rodolfo de Alkmim Moreira Nunes and Rodrigo Gomes de Souza Vale

Summary

Study aim: To evaluate the levels of strength, agility and the maximal oxygen uptake (VO2max) between the offensive and de­fensive teams of football players. Material and methods: In the present cross-sectional study, 20 male Brazilian football players were divided into an offensive group (OG, n = 10, age: 25.50 ± 6.15 years) and a defensive group (DG, n = 10, age: 22.50 ± 5.48 years). We used the dy­namometer for back and legs, the shuttle run test, and the Cooper test to evaluate strength, agility and VO2max, respectively. Results: The independent Student t-test showed that the OG was significantly more agile than the DG (p < 0.05). The other variables did not show any statistically significant differences. In the OG there was a strong correlation between agility and VO2max (r = - 0.834, p = 0.003, r2 = 0.70). However, in the DG there was a moderate correlation between the same variables (r = - 0.677, p = 0.031, r2 = 0.46). This shows that the greater the agility is, the higher is the VO2max. There was no correlation between the variables muscle strength and body fat percentage. Conclusions: The study showed that the OG has a better physical condition than the DG.

Open access

Jurandir Baptista da Silva, Vicente Pinheiro Lima, Gabriel Andrade Paz, Caroline Reis de Oliveira, Francisco D’urso, Rodolfo de Alkmim Moreira Nunes, Juliana Brandão Pinto de Castro and Rodrigo Gomes de Souza Vale

Summary

Study aim: To determine and compare the time under tension (TUT) required to perform 8, 10 and 12 repetition maximum (RM) loads in the bench press exercise.

Material and methods: Twenty men (24.17 ± 4.69 years) were selected intentionally and properly. We included in the study physically active individuals, with a weekly frequency of physical activity of at least two days for six months, and excluded individuals with injury or pain that could interfere with the correct execution of the exercise and individuals with positive PAR-Q. The 10-RM test consisted in performing ten consecutive repetitions with maximum overload and the highest speed in bench press exercise on the Smith machine. After 48 h, 10-RM sets were performed with the load obtained in the 10-RM load testing. The TUT in 10-RM was verified through kinematics using the timing technique of the Kinovea software.

Results: The RM loads and TUT obtained during the retest session showed normal distribution between subjects. However, no significant differences were found between the loads 8, 10 and 12-RM within and between subjects (p < 0.05). The verified TUT showed a difference from 8 to 10-RM and from 8 to 12-RM, but no significant difference was found between TUT protocols for 10 and 12-RM (p < 0.05).

Conclusion: The study results enable evaluation of TUT in bench press exercise on the Smith machine for the study sample, allowing, for this group, the prediction and control of training intensity through the TUT.

Open access

Renato Tavares Fonseca, Rodolfo De Alkmim Moreira Nunes, Juliana Brandão Pinto de Castro, Vicente Pinheiro Lima, Sérgio Gregorio Silva, Estélio Henrique Martin Dantas and Rodrigo Gomes De Souza Vale

Abstract

Purpose. To compare the effects of aquatic and land plyometric training on the vertical jump (VJ) and delayed onset muscle soreness (DOMS) in soccer players. Methods. Twenty-four male soccer players aged 16-18 years (16.53 ± 0.5 years) were randomly divided into three groups: aquatic plyometric training (APT) (n = 8; age: 16.4 ± 0.4 years; body mass: 68.3 ± 7.54 kg; height: 179.75 ± 8.13 cm); land plyometric training (LPT) (n = 8; age: 16.5 ± 0.5 years; body mass: 68.2 ± 7.8 kg; height: 177.0 ± 7.4 cm); and control group (n = 8; age: 16.7 ± 0.6 years; body mass: 61.2 ± 6.5 kg; height: 171.43 ± 5.75 cm), not performing any jump program. An identical training program was applied for 6 weeks, totalling 944 jumps. The VJ was evaluated on a leap jump platform and the Visual Analogue Scale measured the change in DOMS perception. Results. There was a significant increase in the VJ height in both experimental groups (LPT and APT) (p < 0.05). A significant reduction in DOMS perception was verified for the APT group in comparison with the LPT group (p < 0.05) between the first and last week of training. The foot contact time significantly decreased (p < 0.05) in the APT group from pre- to posttest. Significant improvements (p < 0.05) were observed in the flight time and jump speed from pre- to post-test in both LPT and APT groups. Conclusions. APT can increase the VJ height and reduce DOMS perception in soccer players.