Acute effects of NIV on peripheral muscle function and aerobic performance in patients with chronic obstructive pulmonary disease: a pilot study.

BACKGROUND: Non-invasive ventilation (NIV) reduces respiratory load and demands on peripheral muscles. METHODS: This study aims to evaluate the acute effects of bi-level NIV on peripheral muscle function during isokinetic exercise and aerobic performance in chronic obstructive pulmonary disease (COPD) patients. This is a pilot crossover study performed with a non-probabilistic sample of 14 moderate to very severe COPD patients. Procedures carried out in two days. Dyspnea, quality of life, lung function, respiratory muscle strength, functional capacity (6-min walk test-6MWT), and isokinetic assessment of the quadriceps were assessed. Blood samples (lactate, lactate dehydrogenase, and creatine kinase concentration) were also collected. Right after, NIV was performed for 30 min (bi-level or placebo, according to randomization) followed by new blood sample collection, 6MWT, and isokinetic dynamometer tests. Before and after evaluations, the subjective perception of dyspnea and fatigue in the lower limbs was quantified. After a wash-out period of seven days, participants returned, and all assessments were performed again. RESULTS: NIV showed improvements in perceived exertion and dyspnea after isokinetic exercise (p < 0.02 and p < 0.05, respectively). CONCLUSIONS: NIV improves the perception of dyspnea and fatigue during the isokinetic exercise.

Nível de atividade física e aptidão cardiorrespiratória em escolares com sobrepeso/obesidade / Physical activity level and cardiorespiratory fitness in overweight/obese students

Introdução: Obesidade infantil, inatividade física e baixo nível de aptidão física geram consequências precoces na saúde cardiovascular e metabólica. Objetivos: Comparar o nível de atividade física (IPAQ versão curta) com aptidão cardiorrespiratória ( shuttle run test) em escolares com sobrepeso/obesos. Métodos: Realizou-se estudo da prevalência de sobrepeso/obesidade em 334 escolares, divididos posteriormente em dois grupos: G1, com sobrepeso/obesos (n=39), e G2, eutróficos (n=39), para a aplicação do IPAQ versão curta e shuttle run test. Resultados: Classificaram-se 261 escolares como eutróficos; 56 como obesos/com sobrepeso; e 17 com desnutrição/desnutrição severa. Não houve diferença significativa no IPAQ versão curta (p<0,840). No shuttle run test, o G2 apresentou VO2máx por estágios (p<0,004) e por metros (p<0,000) significativamente maiores. Conclusões: IPAQ versão curta apresentou limitações para determinar o nível de atividade física dos escolares estudados, comparado ao shuttle run test, e os resultados do shuttle run test podem ser mais precisos se analisados por metro.

Introduction: Childhood obesity, physical inactivity, and low physical fitness give rise early to consequences for cardiovascular and metabolic health. Objectives: To compare physical activity level (IPAQ short version) with cardiorespiratory fitness (shuttle run test) in overweight/obese children. Methods: We carried out a study in order to analyze the prevalence of overweight/obesity in 334 schoolchildren, who were divided into two groups: G1, overweight / obese (n=39), and G2, normal weight (n=39). The IPAQ short version test and the shuttle run test were applied. Results: A total of 261 students were classified as eutrophic, 56 in obese/overweight, and 17 with malnutrition/severe malnutrition. There was no significant difference in IPAQ short version (p< 0.840). In shuttle run test, G2 showed VO2max by stages (p<0.004) and meters (p <0.000) significantly higher. Conclusions: IPAQ short version was not effective for determining physical activity level of the schoolchildren, compared to the shuttle run test, and the results interpretation of shuttle run test may be more accurate if analyzed by meters.