Percorrer por autor "Amorim, Cesar Ferreira"
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- Association between concentric and eccentric isokinetic torque and unilateral countermovement jump variables in professional soccer playersPublication . Alves, Bruno Mazziotti Oliveira; Scoz, Robson Dias; Burigo, Ricardo Lima; Ferreira, Isabella Christina; Ramos, Ana Paula Silveira; Jose João Baltazar Mendes; Ferreira, Luciano Maia Alves; Amorim, Cesar FerreiraIsokinetic tests have been highly valuable to athletic analysis, but their cost and technical operation turn them inaccessible. The purpose of this study was to verify the correlation between unilateral countermovement jump variables and isokinetic data. Thirty-two male professional soccer players were subjected to the isokinetic testing of both knee extensors and flexors in concentric and eccentric muscle contractions. They also executed unilateral countermovement vertical jumps (UCMJ) to compare maximum height, ground reaction force, and impulse power with isokinetic peak torque. Data analysis was conducted through Pearson correlation and linear regression. A high correlation was found between dominant unilateral extensor concentric peak torque and the UCMJ maximum height of the dominant leg. The non-dominant leg jump showed a moderate correlation. No other variable showed statistical significance. Linear regression allowed the generation of two formulae to estimate the peak torque from UCMJ for dominant and non-dominant legs. Although few studies were found to compare our results, leading to more studies being needed, a better understanding of the unilateral countermovement jump may be used in the future as a substitute to the expensive and technically demanding isokinetic testing when it is unavailable, allowing the assessment of lower limb physical asymmetries in athletic or rehabilitation environments.
- Prevalence and profile of musculoskeletal injuries in high-performance professional brazilian jiu-jitsu athletesPublication . Nery, Lucas Chagas; Pelegrina Junior, Claudinei Chamorro; Saragiotto, Bruno Tirotti; Scoz, Robson Dias; Marson, Runer Augusto; Mendes, José João; Ferreira, Luciano Maia Alves; Amorim, Cesar FerreiraBackground: Brazilian Jiu-jitsu (BJJ) has become popular over the past years; however, few studies investigated the prevalence of injuries in this martial art modality. Objective: This study aimed to determine the prevalence of musculoskeletal injuries in BJJ competitors, along with their profile and characteristics. Methods: One hundred fifteen athletes were included in this cross-sectional study. A hundred fifteen professional high-performance athletes were selected from twenty-five BJJ gyms in São Paulo, Brazil. Descriptive analyses were used to demonstrate the athlete’s characteristics. The Kruskal-Wallis non-parametric test was used to assess the significant differences between the number of injuries categorized by athlete’s belt or performance level category. Additionally, Fisher’s exact test was used to assess possible differences between the belts' frequency of total injuries and injuries per affected site. Results: We observed an injury prevalence of 85.2%, in which the knee (32.6%), shoulder (11.2%), and elbow (8.4%) were the most affected regions. We did not find any significant differences between the number of injuries and belt classification (p=0.093) or the frequency of total injuries per anatomical region among belt classification (p=0.121). Most injuries occurred during training (74%), and the main reason for time loss from training activities was trauma (70%). Conclusion: There is a high prevalence of injuries among BJJ competitors, and the most affected site was the knee.