Measurement properties of the six-minute pegboard and ring test (6PBRT) in healthy adolescents.

OBJECTIVES: To investigate the cardiorespiratory responses to the 6-min pegboard and ring test (6PBRT) and to assess its reproducibility in healthy adolescents. METHODS: It was a cross-sectional study with 52 healthy adolescents (11-18 years old of both genders). The 6PBRT was performed twice on two different days by the same examiner. Intra-rater reliability, percentage of the minimal difference chance (MDC%) and agreement of the number of moving rings were analyzed. Also, cardiopulmonary parameters were collected before and after tests. RESULTS: Intraclass correlation coefficient (ICC) for the number of rings moved was 0.87 (95%CI 0.69-0.93). The mean number of moved rings during the second test was higher. The MDC% with a 95 % confidence interval was greater than acceptable values. Bland-Altman analysis did not show agreement between measurements (bias = 30.1); with upper and lower limits of agreement of -67.8 to 127.9, respectively. There was a significant increase in dyspnea, fatigue and HR values at the end of the tests (p < 0.0001). In both tests, participants reached HR equivalent to 48 % of the maximum predicted. CONCLUSION: Together, the results suggest that the 6PBRT is not a reliable measure for a population of healthy adolescents, which indicates the necessity to perform more than one test. The 6PBRT is suggested to be a submaximal test for this population.

Malocclusion traits and sucking habits in preschool children: a cross-sectional study

Objective: The aim was to evaluate the prevalence of malocclusion traits altogether and separate in anterior open bite, accentuated overjet and posterior cross-bite, and the possible association between them and sucking habits and breastfeeding. Methods : A preschool-based cross-sectional study was conducted with 472 children aged 24-60 months and their parents (response rate 86.6%). Three trained dentists (Kappa > 0.70) examine children for anterior open bite, accentuated overjet and posterior cross-bite and parents answered a questionnaire indicating the presence of breastfeeding, bottle usage, pacifier usage, finger sucking and the length of usage of all these habits. Results : The prevalence of malocclusion traits was 38.8%, Accentuated overjet was the most prevalent (30.3%) followed by posterior cross-bite (8.9%) and anterior open bite (7.4%). The unadjusted Poisson regression showed that children who were not breastfed had 63.0% more prevalent malocclusion traits when compared with those who were breastfed (RP 1.63, 95%CI 1.06-2.50). Length of pacifier usage in months was the only habit remained in the adjusted model associated with anterior open bite (RP 1.10, 95%CI 1.05-1.14, p < 0.000) and accentuated overjet (RP 1.03, 95%CI 1.01- .05, p = 0.004). For posterior cross-bite none habit showed association in the adjusted model. All models were adjusted for age and sex. Conclusion : Accentuated overjet is the most prevalent malocclusion trait. Length of pacifier usage is associated with the presence of malocclusion traits, anterior open bite and accentuated overjet. None of the investigated habits is associated with posterior cross-bite.

Objetivo: O objetivo foi estimar a prevalência de maloclusões avaliadas em conjunto e separadamente em mordida aberta anterior, sobressaliência acentuada e mordida cruzada posterior, e a possível associação entre elas e os hábitos de sucção e amamentação. Métodos : Estudo transversal foi realizado com 472 pré- escolares de 24 a 60 meses e seus pais (taxa de resposta de 86,6%). Três dentistas treinados (Kappa > 0,70) examinaram as crianças para mordida aberta anterior, sobressaliência acentuada e mordida cruzada posterior e os pais responderam a um questionário indicando a presença de amamentação, uso de mamadeira, uso de chupeta, sucção de dedo e tempo de hábito. Resultados : A prevalência de maloclusões foi de 38,8%. A sobressaliência acentuada foi o mais prevalente (30,3%), seguido da mordida cruzada posterior (8,9%) e da mordida aberta anterior (7,4%). A regressão de Poisson não ajustada mostrou que as crianças que não foram amamentadas apresentaram 63,0% maior prevalência de maloclusão quando comparadas com aquelas que foram amamentadas (RP 1,63, IC95% 1,06-2,50). A duração do uso de chupeta em meses foi o único hábito que permaneceu no modelo ajustado associado à mordida aberta anterior (RP 1,10, IC 95% 1,05-1,14, p < 0,000) e sobressaliência acentuada (RP 1,03, IC 95% 1,01- 1,05, p = 0,004). Para mordida cruzada posterior nenhum hábito mostrou associação no modelo ajustado. Todos os modelos foram ajustados por idade e sexo. Conclusão : A sobressaliência acentuada é a maloclusão mais prevalente. O tempo do uso de chupeta está associado à presença de maloclusão, mordida aberta anterior e sobressaliência acentuada. Nenhum dos hábitos investigados está associado à mordida cruzada posterior.