Percorrer por autor "Amorim, César Ferreira"
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- Championship interseason period did not reduce knee peak moment : a 10-years retrospective study of 467 elite soccer playersPublication . Scoz, Robson Dias; Burigo, Ricardo Lima; Ferreira, Isabella Christina; Ramos, Ana Paula Silveira; Judice, André Filipe Teixeira; Mendes, Jose Joao Baltazar; Ferreira, Luciano Maia Alves; Amorim, César FerreiraStudy aim: To compare knee moment profiles of professional soccer players from different playing positions before and after an interseason period. Material and methods: Retrospective study of 467 healthy, professional elite Brazilian soccer players before and after an official championship interseason period during 10-years. Main outcome measures were isokinetic peak moment from knee extensors and flexors from concentric and eccentric contractions. A Two-way ANOVA analysis was used to compare each playing position before and after interseason period. Results: It was found no statistical difference in Ext.CPT (from p = 0.11 to p = 0.97), Ext.EPT (from p = 0.07 to p = 0.85), Flx. CPT (from p = 0.14 to p = 0.90) or Flx.EPT (from p = 0.10 to p = 0.91) between End-Season and Pre-Season evaluations for all playing positions (from Goalkeepers, Defenders, Backsiders, Midfielders and Forwards). Conclusions: Isokinetic peak moment did not have significant differences after an interseason period of 4 to 6 weeks, allowing trainers and coaches to focus their pre-season period on other performance concerns than strengthening.
- 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.
- The effects of the leg position on the Nordic hamstring exercise eccentric force : a randomized cross-over studyPublication . Ferreira, Ricardo Maia; Martins, Pedro Nunes; Nunes, Hugo; Fernandes, Luís Gonçalves; Amorim, César Ferreira; Ferreira, Luciana Maia AlvesGiven the posterior chain configuration, it is anticipated that tibial positioning influences hamstring recruitment; medial hamstrings should be more activated during medial rotation, while lateral hamstrings should be more activated during lateral rotation. However, most studies showing this pattern have focused on concentric or isometric strength, leaving the influence on eccentric strength fairly unknown. Therefore, the aim of this study was to investigate the electromyographic response of the hamstring muscles during Nordic hamstring exercises in three leg positions: internal rotation, external rotation, and neutral. This study encompassed a randomized crossover study and used surface electromyography to analyze the activity of the biceps femoris and semitendinosus muscles during the Nordic hamstring exercise, in the three positions. Results indicated no statistically significant differences in muscle activation between positions or sides (p > 0.05), though small effect sizes were observed for the biceps femoris in different positions (η2 = 0.01–0.03). Furthermore, the internal rotation position generally elicited the highest muscle activations. Notably, biceps femoris muscles exhibited higher activations compared to semitendinosus muscles, with the greatest differences seen in the internal rotation position. This suggests that tibial rotation influences hamstring recruitment patterns; however, it was lower than expected.
- Is pilates better than other exercises at increasing muscle strength? A systematic reviewPublication . Pinto, Júlia Ribeiro; Santos, Cleyton Salvego; Soares, Wuber Jefferson Souza; Ramos, Ana Paula Silveira; Scoz, Robson Dias; Júdice, André Filipe Teixeira de; Ferreira, Luciano Maia Alves; Mendes, José João Baltazar; Amorim, César FerreiraOur objective was to verify the effectiveness of Pilates method compared against other exercise modalities for muscle strength increase, balance and flexibility. Method: Databases used and its respective results were: CENTRAL (n = 456), CINAHL (n = 291), EMBASE (n = 313), PEDro (n = 176), PUBMED (n = 236), SCIELO (n = 98), SPORTDiscus (n = 197) e Web of Science (n = 150). It included randomized controlled studies using Pilates and others exercise modalities that measured muscle strength. Results: Eleven studies were included for analysis. The mean methodological quality score of these studies, evaluated by the PEDro scale, was 6 ± 1. For the primary outcome, not being observed this difference for dynamic force (SMD = -0.29; 95%IC -0.69; 0.10), isometric (SMD = 0.20; 95%IC -0.06; 0.47) or resistance (SMD = -0.19; 95%IC -0.46; 0.07). For secondary outcomes, there was no difference for balance and flexibility. Conclusion: In conclusion, there is very low to low evidence that there is no difference between Pilates and other exercise modalities for dynamic strength, isometric strength, resistance strength, balance and flexibility.
- Long-term effects of a kinematic bikefitting method on pain, comfort, and fatigue : a prospective cohort studyPublication . Scoz, Robson Dias; Oliveira, Paulo Rui de; Santos, Cleyton Salvego; Pinto, Júlia Ribeiro; Melo-Silva, Cesar Augusto; Júdice, André Filipe Teixeira de; Mendes, José João; Ferreira, Luciano Maia Alves; Amorim, César FerreiraThe purpose of this study is to analyze the long-term riders’ subjective responses to a standardized bikefitting method on their bicycles. Eighty-six amateur mountain bikers had their riding posture and bicycle components ergonomically adjusted through a 3D kinematic bikefitting method. Validated subjective scales (Feeling, OMNI, and Numerical Rating Pain Scale) were used to assess their overall riding comfort and fatigue along with localized pain for six body parts. Data were collected just before intervention (baseline or pre), immediately after (or post), and 30, 60, 90, and 120 days after the bikefit session. A Student’s t-test comparing before bikefit and after 120 days showed significant (p < 0.05) reduction in localized pain for all six body parts and riding comfort along with a large effect size effect (d = 1.18) for riding comfort. Although initially reduced, fatigue scores gradually increased over the months, showing a high correlation (r = 0.946) with increased monthly training volume. In conclusion, overall riding discomfort and pain were significantly decreased after a standardized kinematic bikefit session even after 120 days post intervention. However, fatigue scores began to rise after 30 days, showing a high correlation with increasing monthly training volume.
- Strength level of professional elite soccer players after the COVID-19 lockdown period : a retrospective double-arm cohort studyPublication . Scoz, Robson Dias; Burigo, Ricardo Lima; Ferreira, Isabella Christina; Hespanhol, Luiz; Ramos, Ana Paula Silveira; Schlosser, Adriano; Mendes, José João; Ferreira, Luciano Maia Alves; Amorim, César FerreiraBackground. It is well known that periods of inactivity generate a loss of muscle strength, a fundamental component of sports performance in soccer. However, little information is available on the decrease in strength levels in professional soccer players after the quarantine lockdown that occurred during the COVID-19 pandemic. Aim. To compare the isokinetic peak torque profiles of professional soccer players from different teams before and after the quarantine period generated by COVID-19. Methods. A retrospective observational study was performed using data collected from two different professional elite-level soccer teams just before and immediately after the COVID-19 quarantine period. One team gave individual instructions to its players for conditioning maintenance at home during the quarantine period, while the other team used regular video calls to maintain the player’s conditioning status on home training. The main outcomes were the mean peak torque of knee extensors and flexors, from concentric and eccentric contractions of each playing position. Analysis. A two-way ANOVA analysis was used to compare peak torque before and after the quarantine period and between both teams’ strategies, showing a statistically significant reduction in eccentric knee flexor peak torque from the team that did not have remote monitoring. Conclusions. Remote monitoring programs are recommended so that athletes are less affected by the deleterious effects of confinement.