Predictive Equations for Maximum Respiratory Pressures of Women According to Body Mass

Abstract

BACKGROUND:The objective of the present study was to develop predictive equations for maximum respiratory pressures in women according to anthropometric characteristics. METHODS: This cross-sectional study included 156 women between ages 25 and 65 y with a body mass index (BMI) between 18.5 and 55 kg/m 2 , who were evaluated for body mass, height, BMI, neck circumference, waist circumference, hip circumference, and waist/hip ratio. Respiratory muscle strength was assessed by measuring the maximum inspiratory pressure (P Imax ) and maximum expiratory pressure (P Emax ) with an analog vacuum manometer. For statistical analysis, the KolmogorovSmirnov test, Spearman correlation test, and stepwise multiple regression were used. The level of statistical significance was set at 5% (P < .05). RESULTS: Body mass, BMI, neck circumference, waist circumference, hip circumference, and waist/hip ratio showed significant and positive correlations with P Imax and P Emax . On the other hand, age and height showed no significant correlations with P Imax and P Emax . In the regression analysis, the variables that correlated significantly with P Imax and P Emax were used. CONCLUSIONS: Body mass was the variable that best contributed to predicting maximum respiratory pressures values in women (11.70% of the variations of the P Imax and 21.05% of the variations of the P Emax ). For P Imax measurements, the equation ؊0.2 ؋ body mass ؊ 65.6 was established, and for P Emax , the equation 0.3 ؋ body mass ؉ 66.4 was used. It is suggested that the predictive equations developed in this study can be used in the interpretation of the assessment of respiratory muscle strength in morbidly obese women 25-65 y of age.

Nocturnal hypercapnia with daytime normocapnia in patients with advanced pulmonary arterial hypertension awaiting lung transplantation

“…Although obesity hypoventilation syndrome is a major cause of nocturnal hypercapnia [11], the BMI in the majority of the current study patients was lower than normal (18.5 kg/m 2 ). Previously it was revealed that a low BMI affects the respiratory muscle mass, which results in the impairment of muscle performance [25] and a proportional decline in respiratory pressure [26]. In the present study, low values for %FVC, %TLC and %PEF were the most distinct features of nocturnal hypercapnia.…”

Is There Any Relationship Between the Neck Flexor Muscles Endurance, Phonation Time and Peak Expiratory Flow Rate in Young Individuals?

“…Previously, it was found that there was a relationship between PEF and height (29). In another study, there was no correlation with height and maximum expiratory pressure but there was a correlation between body mass index and maximum expiratory pressure (30). On the contrary, we found a very good positive relation between height and PEF and a good positive relation between weight and PEF.…”

"Is Inspiratory Muscle Strength Altered in Women with Obesity? Comparative Analysis and Predictive Equations"

“…Researchers have proposed equations for reference values for measures of respiratory muscle strength in individuals in the ideal weight range taking into consideration sex and age [14][15][16][17][18][19][20][21].…”

“…Evaluating maximum inspiratory pressure (MIP) in obese women, Pazzianotto-Fort, et al [22] compared different predictive equations and found three different values for the same individuals. This demonstrates that respiratory muscle strength is not only correlated with age and sex, but also weight, height and body surface, which underscores the need for studies on predictive equations, particularly for the MIP, involving individuals with obesity [19,20].…”

“…The RT2® device was first used in Brazil by Bien, et al [17] on a sample of individuals in the ideal weight range with the aim of developing predictive equations for MIP for the Brazilian population. Considering the different equipment and methods and the fact that predictive MIP values are only found for individuals in the ideal weight range [14,17,[19][20][21], the aim of the present study was to determine MIP in women with obesity using a manometer (MIPM) and the RT2 device (MIPRT) to contribute to clarifying MIP in this population.…”