Percorrer por autor "Scoz, Robson Dias"
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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.
- 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.
- Discomfort, pain and fatigue levels of 160 cyclists after a kinematic bike-fitting method: an experimental studyPublication . Scoz, Robson Dias; Ferreira, Cesar Amorim; Espindola, Thiago; Santiago, Mateus; Mendes, José João; Oliveira, Paulo Rui de; Ferreira, Luciano Maia Alves; Brito, Romulo NolascoObjective: To analyse rider’s subjective responses after a standardised bicycle ergonomic adjustment method. Methods: Experimental study of 160 healthy, amateur mountain bikers analysed previously and 30 days after a bike-fitting session. The main outcome measures were subjective comfort level (Feeling Scale, FEEL), fatigue (OMINI Scale) and pain (Visual Analogue Scale, VAS). Results: All variables demonstrated statistical significance between groups pre and post bike-fit session (p<0001). FEEL, OMNI and VAS-knee demonstrated large effect sizes (d=1.30; d=1.39 and d=0.86, respectively). VAS-hands, VAS-neck and VAS-back indicated moderate effect size (d=0.58; d=0.52 and d=0.43, respectively). VAS-groin and VAS-ankle indicated a small size effect (d=0.46 and d=0.43, respectively). Conclusions: Overall discomfort, fatigue and pain in healthy mountain biker adults improved according to all three scales. The major improvements in pain levels were detected on the knee, hands, back and neck compared with presession values. Groin and ankle pain had smaller improvements but were still significant. Future clinical trials should address the bias effects of this experimental study.
- Effects of multisession prefrontal cortex tDCS or taVNS on stress, perceived stress and sleep quality : a double-blind, randomized controlled studyPublication . Reis, Laya Dalila dos; Generoso, Laura Pereira; Pereira, Gabrielly Santos; Barú, João Paulo da Silva Teixeira; Candido, Natalie Lange; Capello, Maria Gabriela Maziero; Castro, Renato Ortolani Marcondes de; Cardoso, Edvaldo José Rodrigues; Scoz, Robson Dias; Ferreira, Luciano Maia Alves; Silva, Marcelo Lourenço da; Silva, Josie Resende Torres daIntroduction: Chronic stress is a condition characterized by prolonged stimulation, leading to mental and physical weakness. It can have detrimental effects on individuals’ mental health and cognitive function, potentially causing various health issues. This article explores the potential of non-invasive neuromodulation techniques, specifically transcranial direct current stimulation (tDCS) and transcutaneous auricular vagus nerve stimulation (taVNS), in managing chronic stress and improving sleep quality.Methods: The study conducted a randomized, double-blinded, controlled trial with participants experiencing chronic stress. In total, 100 participants were randomly assigned to one of four conditions: the anodal tDCS group (n = 50), the sham tDCS group (n = 50), the taVNS group (n = 50), or the sham taVNS group (n = 50). Within each condition, participants received five sessions of either active treatment or sham treatment, with 20 min of tDCS over the dorsolateral prefrontal cortex (2 mA) for the tDCS groups, or taVNS on the left ear (20 Hz) for the taVNS groups. At baseline, post-intervention, and 4 weeks thereafter, we evaluated stress using the Lipp’s Inventory of Stress Symptoms for Adults (LSSI), perceived stress through the Perceived Stress Scale (PSS-10), and sleep quality via the Pittsburgh Sleep Quality Index (PSQI).Results: The tDCS and taVNS interventions resulted in reduced stress levels, improved sleep quality, and enhanced perception of stress.Discussion: These findings suggest that tDCS and taVNS hold promise as effective treatments for chronic stress, offering a safe and accessible approach to improving individuals’ wellbeing and overall quality of life.
- 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.
- 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.
- 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.