Dynamic hyperinflation and exercise limitations in obese asthmatic women

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art_FERREIRA_Dynamic_hyperinflation_and_exercise_limitations_in_obese_asthmatic_2017.PDF (970.45 KB)
Citações na Scopus
16
Tipo de produção
article
Data de publicação
2017
DOI
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
AMER PHYSIOLOGICAL SOC
Autores
PORRAS, Desiderio Cano
Citação
JOURNAL OF APPLIED PHYSIOLOGY, v.123, n.3, p.585-593, 2017
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Obese individuals and patients with asthma can develop dynamic hyperinflation (DH) during exercise; however, no previous study has investigated DH as a factor associated with reduced exercise capacity in obese asthmatic women. The aim of the present study was to examine the occurrence of DH and exercise limitations in obese asthmatics. Obese grade II [obese group (Ob-G); BMI 35-39.9 kg/m(2); n = 36] and nonobese [nonobese group (NOb-G); BMI 18.5-29.9 kg/m(2); n = 18] asthmatic patients performed a cardiopulmonary test to quantify peak (V) over dot(O2) and a sub-maximal exercise test to assess DH. Anthropometric measurements, quadriceps endurance, and lung function were also evaluated. A forward stepwise regression was used to evaluate the association between exercise tolerance (wattage) and limiting exercise factors. Fifty-four patients completed the protocol. The Ob-G (n = 36) presented higher peak (V) over dot(O2) values but lower power-to-weight ratio values than the NOb-G (P < 0.05). DH was more common in the Ob-G (72.2%) than in the NOb-G (38.9%, P < 0.05). The Ob-G had a greater reduction in the inspiratory capacity (-18 vs. -4.6%, P < 0.05). Exercise tolerance was associated with quadriceps endurance (r = 0.65; p < 0.001), oxygen pulse (r = 0.52; p = 0.001), and DH (r = -0.46, P = 0.005). The multiple regression analysis showed that the exercise tolerance could be predicted from a linear association only for muscular endurance (r = 0.82 and r(2) = 0.67). This study shows that dynamic hyperinflation is a common condition in obese asthmatics; they have reduced fitness for activities of daily living compared to nonobese asthmatics. However, peripheral limitation was the main factor associated with reduced capacity of exercise in these patients. NEW & NOTEWORTHY This is the first study to investigate the occurrence of dynamic hyperinflation (DH) in obese asthmatics. Our results demonstrate that obese asthmatics present a higher frequency and intensity of DH than nonobese asthmatics. We also show that physical deconditioning in this population is linearly associated with cardiac (O-2 pulse), respiratory (DH), and peripheral muscle (resistance) limitation. However, multiple linear regression demonstrated that peripheral muscle limitation may explain the exercise limitation in this population.
Palavras-chave
asthma, dynamic hyperinflation, exercise test, obesity
URI
https://observatorio.fm.usp.br/handle/OPI/21791
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Artigos e Materiais de Revistas Científicas - FM/MCM
Artigos e Materiais de Revistas Científicas - FM/MFT
Artigos e Materiais de Revistas Científicas - HC/ICESP
Artigos e Materiais de Revistas Científicas - HC/ICHC
Artigos e Materiais de Revistas Científicas - HC/InCor
Artigos e Materiais de Revistas Científicas - LIM/09
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