Katy Mitchell1, Louise Sewell1, Sally Singh1 and Sally Singh2
for Exercise and Rehabilitation Science, University Hospitals of
Leicester NHS Trust, Leicester, United Kingdom, 2Faculty of Health and Life
Sciences, Coventry University, Coventry, United Kingdom
In order to target treatment
effectively, it would be interesting to learn who is most or least
likely to improve their physical activity (PA) in response to an
intervention aimed at improving PA.
A sample of 39 people with
n=24; mean (SD) age 66(8) years; FEV1 1.45(0.62)
litres; BMI 27.60(5.56)] underwent a six-week home-based
self-management programme (SPACE FOR COPD) which aimed to improve PA. A
range of measures were taken at baseline and 6 weeks, including age, FEV1,
BMI, the Incremental Shuttle Walk Test(ISWT), Endurance Shuttle Walk
Test (ESWT), Bristol COPD Knowledge Questionnaire (BCKQ), Hospital
Anxiety and Depression Scale(HADS), the Pulmonary Rehabilitation Index
of Self-Efficacy (PRAISE), the Chronic Respiratory Questionnaire(CRQ)
and Medical Research Council (MRC) dyspnoea grade. The SenseWear
Armband (SAB) was worn for 7 days at both time points and time in
moderate-vigorous activity (MVPA) in bouts of at least 10 minutes was
the primary measure collected.
Time in MVPA in 10 minute
increased from median (IQR) 45(10-155) minutes at baseline to
96(28-246) minutes at 6 weeks. Backward stepwise linear regression was
performed, entering baseline and change from baseline-6weeks on all
measures, to predict change in time spent in MPVA accumulated in bouts.
Only baseline MRC dyspnoea grade was significant, and accounted for 10%
of the variance.
It was not possible to use
change parameters to adequately predict response in PA levels after a
PA intervention. It is likely that PA is influenced by a wider range of
factors, including environmental and social, that cannot be accounted
for in this kind of modelling.