Percorrer por autor "Marson, Runer Augusto"
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- Different smoothing window lengths can estimate the neuromuscular fatigue threshold at the same intensity of the lactate threshold during the leg press exercisePublication . Marson, Runer Augusto; Sousa, Nuno Manuel Frade de; Scoz, Robson Dias; Mendes, José João; Ferreira, Luciano Maia Alves; Melo, Marco Aurélio Anunciação de; Baldissera, Vilmar; Freitas, Lucas Filgueiras; Amorim, César FerreiraBackground: This study aimed to compare different smoothing window lengths used to compute the RMS and their impact on RMS slope during leg press exercise and to compare the RMS slope behavior with lactate threshold. Methods: Twelve subjects performed an incremental test on a leg press machine where blood lactate concentration was measured at each stage. The RMS of vastus medialis (VM), vastus lateralis (VL) and rectus femuralis (RF) were computed for 200, 1500 and 3000ms windows length periods, and the RMS linear slope was used to interpret the results in the amplitude domain. The EMG fatigue threshold (EMGth) was determined for the quadriceps muscle during the three smoothing window lengths. Results: There was no significant difference (p> 0.05) in RMS slope between the three different RMS window length analyses for VM and VL muscles. The RMS slope was significantly higher (p ≤ 0.05) for the window length period of 1500 and 3000ms compared to 200ms in some intensities of exercise. The ICCs between the RMS slopes were 0.94 for RF and 0.95 for VL and VM. There was no significant difference (p> 0.05) between the EMGth at different window length periods and the lactate threshold (28.0 ± 3.7% of 1RM). Conclusion: Different smoothing window lengths to computed RMS could be used during resistance exercise without differences in RMS slope. The smoothing window lengths don´t influence EMGth intensity and are related to the lactate threshold.
- 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.