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Objectives: To compare the obtained values for maximal respiratory pressures of a sample of Brazilian adolescents with the values predicted by Wilson etal. and Domènech-Clar et al. Methods: 156 adolescents (84 boys) aged between 12 and 17 years were assessed. Maximal respiratory pressures were assessed by a digital manometer with the adolescents in the seated position and wearing a nose clip. Maximal inspiratory and expiratory pressures were performed from residual volume and total lung capacity, respectively. Comparison of the values of maximal respiratory pressures obtained in this study with those predicted by the equations proposed by Wilson et al. and Domenèch-Clar et al., was performed by the paired Student's t test. To verify the association between these values, the Pearson's correlation test was used. Results: Mean maximal inspiratory pressure was 74,66 ± 22,95 cm H2O and 103,52 ± 25,67 cm H2O for girls and boys, respectively. Mean maximal expiratory pressure was 86,23 ± 25,92 cm H2O and 120,08 ± 27,37 cm H2O for girls and boys, respectively. The values obtained by this study did not differ and also did not significantly correlate with those predicted by the equations proposed by Wilson et al., e Domènech-Clar et al. Conclusions: The equations proposed by Wilson et al. and Domènech-Clar etal. were not successful in predicting the values for maximal respiratory pressures in the population studied, indicating the necessity of using in clinical practice reference values from a healthy population of the same ethnicity. [ABSTRACT FROM AUTHOR]

Some literatures mention that the retard ripening of peaches 1-MCP-treated is due to accumulation of CO2 during the application of 1-MCP, however the effect of the 1-MCP can be inhibited by CO2.The objectives of this research were to evaluate the effect of partial pressure of CO2, during the treatment with 1-MCP (1μL L-1), as well as the reapplication with 1-MCP (1μL L-1), on ripening 'Rubidoux' peaches. The treatments evaluated were: without 1-MCP + 0.1kPa of CO2; 1-MCP + 0.1kPa of CO2; 1-MCP + 2.5kPa of CO2; 1-MCP + 7.5kPa of CO2; and daily applications of 1-MCP for four days + 0.1 kPa of CO2. The increase of CO2 partial pressure during the treatment with 1-MCP reduced its efficiency in reducing respiration and ethylene production rates and delayed softening and skin color change. Soluble solids content and titratable acidity were not affected by treatments. The effect of 1-MCP on softening and color change is reduced with the advance in time after treatment, possibly reflecting the biosynthesis of new receptors for ethylene. [ABSTRACT FROM AUTHOR]