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Efeito da posição da barra e da intensidade na cinética plantar durante o agachamento em praticantes de levantamento de peso avançados e altamente avançados: um estudo transversal

Thu, 01 Jan 2026 00:00:00 GMT

Título: Efeito da posição da barra e da intensidade na cinética plantar durante o agachamento em praticantes de levantamento de peso avançados e altamente avançados: um estudo transversal Autor(es): Matos, Mateus Teixeira Abstract: Introduction: Barbell squats are used for strength development and rehabilitation. Bar position in the back squat (BS), front squat (FS), and overhead squat (OHS) alters center-of-mass configuration and stability demands. However, studies examining plantar kinetics under submaximal and maximal loads remain limited. This study investigated the effect of bar position and load intensity on plantar kinetics in advanced weightlifters. Methods: In this cross-sectional study, sixteen participants (age 31.0 ± 11.6 years; body mass 85.2 ± 8.8 kg; training score 3.81 ± 0.40) performed BS, FS, and OHS at 65% and 90% of three-repetition maximum (3RM). F-ScanTM sensors recorded center of pressure (COP) displacement and velocity in the anteroposterior, mediolateral, and total directions, mean plantar pressure (PP), and force in the calcaneus, midfoot, and metatarsal regions. Results: Total COP displacement area did not differ between squat variations (F(1.44; 21.61) = 0.321; p = 0.658; η2p = 0.021) or intensities (F(1; 15) = 3.716; p = 0.073; η2p = 0.199). Total COP velocity was greater in the OHS than in the BS at 65% of 3RM (OHS: 361.3 ± 298.1 mm/s; BS: 239.2 ± 100.3 mm/s; χ2(2) = 6.50; p = 0.039), with no difference at 90% (χ2(2) = 2.63; p = 0.269). Midfoot force was greater in the BS than in the OHS at both 65% and 90% of 3RM (p < 0.001 for both). PP and calcaneal force increased across intensities only in the FS (p = 0.008 and p = 0.021; large effects). Discussion: The findings partially supported the hypotheses. Greater COP velocity in the OHS occurred only at 65% of 3RM. Increased calcaneal pressure and force in the FS were driven by intensity rather than by direct differences between squat variations. Bar position may alter plantar load distribution and COP velocity without changing total COP displacement area, indicating technique-specific postural adjustments. Squat selection should be individualized according to training goals and functional demands. Tipo: Dissertação

Incontinência urinária e fatores associados em mulheres com lúpus eritematoso sistêmico: um estudo transversal

Thu, 01 Jan 2026 00:00:00 GMT

Título: Incontinência urinária e fatores associados em mulheres com lúpus eritematoso sistêmico: um estudo transversal Autor(es): Lima, Talita de Oliveira Abstract: Background: Systemic lupus erythematosus (SLE) is a chronic inflammatory autoimmune disease characterized by manifestations affecting multiple organ systems, including the musculoskeletal system. Consequently, the pelvic floor muscles (PFMs) of women with SLE may be impaired, which can lead to pelvic floor dysfunction (PFDs), such as urinary incontinence (UI). Objective: To determine the prevalence of urinary incontinence in women with systemic lupus erythematosus and identify factors associated with urinary incontinence in this population. Methods: A cross-sectional study was conducted over 12 months in women with SLE. UI was assessed using the 3 Incontinence Questions (3IQ), severity using the International Consultation on Incontinence Questionnaire – Short Form (ICIQ-SF), impact of urinary symptoms using the Urinary Impact Questionnaire (UIQ-7), quality of life (QoL) using the 12-Item Short Form Health Survey (SF-12), and functional performance using the 30-Second Sit-to-Stand (SIT) and Timed Up and Go (TUG) tests. Descriptive and bivariate analyses were performed, and factors associated with urinary incontinence (UI) were investigated using Poisson regression with robust variance, with prevalence ratios (PR) and 95% confidence intervals (CI). Statistical significance was defined as p < 0.05. Results: A total of 231 women (age 47 ± 12 years) were included. UI was identified in 52% (95% CI 46.0–58.7) of the participants. In the bivariate analysis, UI was associated with age, paid employment, family income, and some clinical and obstetric characteristics. In the final multivariate Poisson regression model, lower physical and mental health scores were associated with UI (PCS: PR = 0.99; 95% CI: 0.97–1.00; p = 0.024; MCS: PR = 0.99; 95% CI: 0.97–1.00; p = 0.033). Conclusions: UI was present in more than half of the women with SLE and was associated with worse QoL. Tipo: Dissertação

Efeito agudo do flossing tecidual sobre a dor e qualidade do movimento em pacientes com osteoartrite de joelho: ensaio controlado aleatorizado

Thu, 01 Jan 2026 00:00:00 GMT

Título: Efeito agudo do flossing tecidual sobre a dor e qualidade do movimento em pacientes com osteoartrite de joelho: ensaio controlado aleatorizado Autor(es): Sousa, Ana Patrícia de Oliveira Abstract: Background: Tissue flossing involves the application of a compressive elastic band around joints and soft tissues and has been investigated for its potential effects on pain, range of motion, and physical performance. However, most available evidence comes from healthy or physically active individuals, and its effects in people with knee osteoarthritis (KOA) remain unclear. Objective: To investigate the acute effects of tissue flossing on pain, muscle activation, kinematic variables, and functional performance during a closed kinetic chain exercise in individuals with KOA. Methods: This randomized, placebo-controlled clinical trial included 80 individuals with KOA (mean age, 62 years; 83.8% women), with participants and assessors blinded to group allocation. The primary outcome was knee pain intensity during squatting, assessed using a numeric pain rating scale. Secondary outcomes included functional performance assessed using the Step Up and Down (StUD) test; activation of the rectus femoris, vastus medialis, and vastus lateralis muscles assessed using surface electromyography; and two-dimensional kinematic variables. Assessments were performed at baseline, during the intervention, and 20 minutes after the intervention. Participants were allocated to either the tissue flossing group (120 mmHg) or the placebo group (40 mmHg). The intervention was applied once during bilateral squatting. Data were analyzed using repeated- measures linear mixed models, considering the group × time interaction and a significance level of 5%. Results: Pain intensity decreased over time in both groups. However, no statistically significant between-group differences were observed during the intervention (mean difference, 0.9; 95% CI, −0.3 to 2.1) or at the 20-minute follow-up (mean difference, 0.6; 95% CI, −0.5 to 1.8). No statistically significant between-group differences were observed in muscle activation, kinematic variables, or functional performance. Conclusion: A single session of tissue flossing applied during squat exercise did not demonstrate statistically significant superiority over placebo for pain or the assessed secondary outcomes in individuals with KOA during the 20-minute follow-up period. Tipo: Dissertação

Validação do instrumento de avaliação do engajamento nas aulas de educação física escolar

Thu, 01 Jan 2026 00:00:00 GMT

Título: Validação do instrumento de avaliação do engajamento nas aulas de educação física escolar Autor(es): Oliveira, Carla Thais de Sousa Abstract: INTRODUCTION: School engagement is a multidimensional construct that is fundamental for assessing students' active participation. Given the scarcity of validated observational tools in Brazil to measure the engagement of children in the early years of basic education during school physical education (SPE) classes, the Engagement Assessment Instrument for School Physical Education Classes (AVENG) was developed. METHOD: The refinement and validation process for AVENG was conducted through two complementary methodological stages: a cross-sectional qualitative approach and a quantitative psychometric analysis involving Exploratory Factor Analysis (EFA) and reliability analysis. The qualitative stage investigated the understanding, judgment, and response to the instrument's items through Cognitive Interviews (CI) with a convenience sample of five professionals who had previously administered AVENG. SPE classes were video recorded using smartphones from complementary angles, followed by the administration of a verbal probing protocol. RESULTS: The qualitative analysis identified convergences, divergences, recurring issues, and suggestions, resulting in semantic adjustments and culminating in the creation of a detailed Evaluator's Manual linked to the International Classification of Functioning, Disability and Health (ICF). The subsequent quantitative stage evaluated the structural construct validity and reliability of AVENG using a sample of 55 children (aged 7 to 10) from municipal schools in Fortaleza, Ceará. Practical classes were filmed. Children were assessed in 45-second cycles during these classes using a 1-to-3 Likert scale. EFA with oblique rotation revealed a two-factor structure explaining 72% of the total data variance, integrating the three theoretical dimensions due to the practical inseparability of the concepts. Discriminant validity between the factors was moderate (Φ = 0.371), while Cronbach’s alpha (α = 0.894) and McDonald’s omega (ω = 0.911) indices indicated strong reliability. Although sensitivity analyses detected sample-specific issues—such as low factor loading for item 5 (verbal interaction) and a high frequency of "Not Applicable" responses for items 3 and 7—the decision was made to retain these items. Furthermore, higher engagement levels were observed among younger children and girls. CONCLUSION: AVENG emerges as a promising and psychometrically robust observational tool for the school physical education context. The small size and heterogeneity of the quantitative sample are noted as limitations; therefore, further large-scale studies and Confirmatory Factor Analysis are recommended to definitively refine the instrument. Tipo: Dissertação