Article

Chronic obstructive pulmonary disease (COPD) affects respiratory
functioning and psychosocial factors. However, little is known about perceived
ability of people with COPD to engage in a regular exercise program. This study
assessed respiratory parameters, exercise capacity, psychosocial factors and
their relations in people with COPD. METHODS: This cross-sectional study involved
patients with COPD recruited from a Nigerian university teaching hospital.
Respiratory parameters including forced expiratory volume in 1sec (FEV1) and
forced vital capacity (FVC) were assessed by using a spirometer and FEV1/FVC
ratio was calculated. Participants were sitting upright in a comfortable chair
and wearing a nose clip for measurements. The procedure was performed in
accordance with the American Thoracic Society criteria. Exercise capacity was
assessed by the 6-min walk test (6MWT). Gait speed was assessed by the distance
covered in 6min. Perceived exercise self-efficacy (PESE) and rating of perceived
exertion (RPE) were assessed by exercise self-efficacy and Borg scales,
respectively. Data were analysed using descriptive and inferential statistics.
Alpha level was set at P<0.05. RESULTS: The mean age of the 125 participants was
62.0+/-7.1years (60% male). The mean values for FEV1, FVC and FEV1/FVC were
1.8+/-0.6L, 2.4+/-0.5L and 58.0+/-8.8%, respectively, and the mean 6MWT and PESE
values were 291.1+/-41.6m 63.1+/-11.2%. Exercise capacity was correlated with
mean values for the respiratory parameters FEV1 (r=0.29; P=0.035), FVC (r=0.32;
P=0.045) and FEV1/FVC ratio (r=0.37; P=0.007), and both exercise capacity and
PESE were correlated with gait speed (r=0.96, P=0.001 and r=0.57; P=0.042) and
RPE (r=0.42, P=0.050 and r=-0.44; P=0.032), but PESE was not correlated with
respiratory parameter values (P>0.05). CONCLUSION:
Participants with COPD
demonstrated reduced respiratory parameter values and low exercise capacity but
moderate PESE. We found significant correlations between exercise capacity and
respiratory parameter values, but PESE was correlated with only gait speed and
RPE. The study has implications for respiratory health promotion and exercise
adherence.
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Langue : ANGLAIS