Article

Prolonged sedentary time is recognized as a distinct health risk, and
mortality risks are expected to be greatest for individuals with low exercise
levels. It is unknown whether participation in exercise-based cardiac
rehabilitation (CR) programs influences sedentary behaviour particularly among
those patients expected to be at greatest mortality risk.
This study examined the
influence of CR participation on sedentary behaviour and identified the
proportion and characteristics (socio-demographic and clinical) of patients who
do not meet exercise recommendations and have prolonged sedentary times. METHODS:
A prospective study was conducted among patients of an exercise-based CR program
and assessments performed at baseline and 3 months. Physical activity and
sedentary behaviour information were collected by self-report, and convergent
validity was examined on an accelerometer-wearing subsample. RESULTS: Of 468 CR
patients approached, 130 participants were recruited with an average sedentary
time of 8hours/day. Sedentary behaviour remained consistent at follow-up
(relative change= -2.4%, P=0.07) notwithstanding a greater proportion meeting
exercise recommendations (relative change= 57.4%). 19.2% of participants were
classified to have prolonged sedentary time and not meet exercise recommendations
at baseline. No significant differences were found between the characteristics of
high-risk individuals and lower risk subgroups. Findings were consistent among
the accelerometer-derived subgroup and the overall sample despite poor to
moderate convergent validity. CONCLUSIONS: These results suggest that the
exercise-focus of CR may not reduce sedentary behaviours. Future studies are
needed to determine whether sedentary behaviour-specific reduction strategies are
more effective than traditional exercise-based strategies and lead to meaningful
improvements in clinical outcomes.
CI - Copyright (c) 2017 Elsevier Masson SAS. All rights reserved.

Langue : ANGLAIS