Evolution of respiratory muscle strength in post-operative gastroplasty

• Autor(a) principal: Parreira,Verônica F.
• Data de Publicação: 2012
• Outros Autores: Matos,Clarissa M. P., Athayde,Filipe T. S., Moraes,Karoline S., Barbosa,Mariana H., Britto,Raquel R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Physical Therapy
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-35552012000300008
• topic: maximum respiratory pressures; assessment; physical therapy; gastroplasty; post-operative; respiratory muscle strength

BACKGROUND: Obesity is a worldwide health problem that may also induce respiratory dysfunction. Literature linking weight loss and maximum respiratory pressures is inconclusive. OBJECTIVE: To evaluate longitudinally the maximum inspiratory pressure (MIP) and maximum expiratory pressure (MEP) of morbidly obese individuals before and after gastric bypass surgery, and to compare them to a control group matched by sex and age. METHODS: A vacuum manometer (GeRar®, SP, Brazil) was used to assess the MIP and MEP of 30 morbidly obese participants (24 women), aged 32±8 years and with body mass index (BMI) of 43±4 kg/m², both before and then one and six months after gastric bypass surgery. After an average of 36 months, 17 patients were reevaluated. A control group of 30 individuals with normal lung function (aged 30±8 with a BMI of 22±2 kg/m²) was also studied. An unpaired t-test and ANOVA for repeated measures were used for statistical analysis, with p<0.05 considered as significant. RESULTS: No significant differences were observed in the baseline evaluation between the two groups. A significant increase was found in MIP after approximately 36 months of surgery in the obese group. A significant decrease in MEP was observed after one month, as well as a significant increase after 36 months compared with one and six months post-surgery. CONCLUSION: The data showed a significant long-term increase in MIP, as well as a significant decrease in MEP after one month followed by a return to pre-operative values, which indicates that gastric bypass surgery has a positive influence on the strength of inspiratory muscles.