 The study evaluated respiratory muscle strength in 100 non-smoking, randomly selected Brazilian adults using static measurements, MIP and MEP, and dynamic maneuvers, MVV. Gender-specific linear prediction equations were developed to estimate respiratory muscle strength based on age and anthropometric measurements. The study found that previous studies systematically underestimated observed values of MIP and that self-reported physical activity and maximum aerobic power correlate strongly with both respiratory and peripheral muscular strength. The results provide a new frame of reference to evaluate the normalcy of some useful indexes of respiratory muscle strength in Brazilian males and females aged 20 to 80. This article was authored by J. A. Netter, S. Andrioni, M. C. Larario, and others.