Breathing pattern and thoracoabdominal motion during exercise in chronic obstructive pulmonary disease
Braz. j. med. biol. res
;
41(11): 945-950, Nov. 2008. graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-500358
ABSTRACT
Subjects with chronic obstructive pulmonary disease (COPD) present breathing pattern and thoracoabdominal motion abnormalities that may contribute to exercise limitation. Twenty-two men with stable COPD (FEV1 = 42.6 ± 13.5 percent predicted; age 68 ± 8 years; mean ± SD) on usual medication and with at least 5 years of diagnosis were evaluated at rest and during an incremental cycle exercise test (10 watts/2 min). Changes in respiratory frequency, tidal volume, rib cage and abdominal motion contribution to tidal volume and the phase angle that measures the asynchrony were analyzed by inductive respiratory plethysmography at rest and during three levels of exercise (30-50, 70-80, and 100 percent maximal work load). Repeated measures ANOVA followed by pre-planned contrasts and Bonferroni corrections were used for analyses. As expected, the greater the exercise intensity the higher the tidal volume and respiratory frequency. Abdominal motion contributed to the tidal volume increase (rest 49.82 ± 11.19 percent vs exercise 64.15 ± 9.7 percent, 63.41 ± 10 percent, and 65.56 ± 10.2 percent, respectively, P < 0.001) as well as the asynchrony [phase angle 11.95 ± 7.24° at rest vs 22.2 ± 15° (P = 0.002), 22.6 ± 9° (P < 0.001), and 22.7 ± 8° (P < 0.001), respectively, at the three levels of exercise]. In conclusion, the increase in ventilation during exercise in COPD patients was associated with the major motion of the abdominal compartment and with an increase in the asynchrony independent of exercise intensity. It suggests that cycling exercise is an effective way of enhancing ventilation in COPD patients.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Diafragma
/
Mecânica Respiratória
/
Doença Pulmonar Obstrutiva Crônica
/
Parede Abdominal
/
Parede Torácica
Limite:
Idoso
/
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2008
Tipo de documento:
Artigo
/
Documento de projeto
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Federal de Minas Gerais/BR
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