Abstract Background Physical activity is beneficial for maintaining health, quality of life, physical and psychological well-being. However, there are still few studies that have the practice of physical activity and vocal problems. Objective To identify the prevalence of vocal problems and their association with the level of physical activity in public elementary school teachers. Method A cross-sectional analytical study with a probabilistic sample of a single-stage conglomerate composed of 634 teachers was carried out. The dependent variable was the existence of vocal issues (four or more signs/symptoms). The independent variables were related to sociodemographic, occupational, and life and health aspects, and they were considered in the modeling as adjustment factors. The level of physical activity was measured by the International Physical Activity Questionnaire - IPAQ (short version). Descriptive, bivariate, and multiple analyzes were performed (Poisson Regression). Results There was a high prevalence of vocal signs/symptoms (79.2%), as well as those with four or more signs/symptoms, called vocal problems (27.3%). In the adjusted final model, the prevalence of vocal problems was higher among female teachers (PR = 1.9), with a longer teaching period (PR = 1.3), with poor quality of life in the physical domain (PR = 1.9) and in the psychological domain (1.4), and among sedentary/insufficiently active teachers (PR = 1.3). Conclusion The practice of physical activity showed a relationship with vocal health even after controlling the other variables, which emphasizes the need for teacher awareness and encouragement regarding the practice of physical activity.

Resumo Introdução A atividade física é benéfica para a manutenção da saúde, qualidade de vida, bem-estar físico e psicológico. No entanto, ainda são poucos os estudos que abordam a prática de atividade física e os problemas vocais. Objetivo Verificar a prevalência de problemas vocais e sua associação com o nível de atividade física em professores de escolas públicas da educação básica. Método Estudo transversal analítico com amostra probabilística por conglomerado em estágio único composta de 634 professores. A variável dependente referiu-se à existência de problemas vocais (quatro ou mais sinais/sintomas). As variáveis independentes foram relacionadas aos aspectos sociodemográficos, ocupacionais, hábitos de vida e saúde, consideradas na modelagem como fatores de ajuste. O nível de atividade física foi mensurado pelo International Physical Activity Questionnaire - IPAQ (versão curta). Procedeu-se à análise descritiva, bivariada e múltipla (Regressão de Poisson). Resultados Houve alta prevalência de sinais/sintomas vocais (79,2%), bem como daqueles com quatro ou mais sinais/sintomas, denominados de problemas vocais (27,3%). No modelo final ajustado, a prevalência de problemas vocais foi maior entre professores do sexo feminino (RP=1,9), com maior tempo de docência (RP=1,3), com qualidade de vida insatisfatória no domínio físico (RP=1,9) e no domínio psicológico (1,4) e entre os professores sedentários/insuficientemente ativos (RP=1,3). Conclusão A prática de atividade física mostrou relação com a saúde vocal mesmo após controle por outras variáveis, o que enfatiza a necessidade de conscientização e estímulo aos professores quanto à prática de atividade física.

Elastic vector meson electroproduction is calculated through integrals of the overlap product of photon and vector meson wave functions, multiplied by the amplitude for the scattering of $q \bar{q}$ dipole pairs off the proton. In this nonperturbative QCD calculation, for sizes of the overlap functions that are smaller than the typical ranges of the interaction of the dipoles with the proton, the amplitudes factorize, with overlap strengths (integration extended over the light front coordinates describing the $q \bar{q}$ dipoles) containing all Q² dependence of the observables. This factorization is important in the description of the experimental data for all S-wave vector mesons.

We summarize the contributed papers and the talks in the plenary and parallel sessions in this XXI Brazilian National Meeting on Particles and Fields that are classified as of phenomenology kind. We try to put the activities here developed in the perspective of the existing community of phenomenologists in Brazil 2000.

We review the role of the QCD vacuum structure in the determination of the properties of states and processes occurring in the confinement regime of QCD. The vacuum correlation model of non-perturbative QCD is mentioned as a bridge between the fundamental theory and the description of the experiments. The model of the stochastic vacuum provides the framework in which a simple and effective description of the high-energy pp and p data can be given, leading to a determination of relevant parameters of non-perturbative QCD and to a good description of the data. A slow increase of the hadronic radii with the energy accounts for the energy dependence of all observables.