Measuring Postural Changes and Sedentary Behaviour in Patients After Knee Replacement
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Date
2014-08-06
Authors
Pollard, Gail
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Abstract
SUMMARY: Negative health consequences are associated with prolonged sedentary
behaviour. Patients who require total knee replacements tend to be obese and sedentary and
often do not increase activity levels post-operatively despite reductions in pain.
Objectives: The purpose of this study was to determine the accuracy of ActiGraph and
activPAL activity monitors in categorizing posture (e.g. sitting versus standing) in total knee
replacement patients. Secondarily we were interested in examining data collected over 7 days
as patients went about their normal routines.
Methods: Forty patients (50-80 years of age) wore an ActiGraph GT3X+ monitor on their waist
and an activPAL monitor on their thigh during their 5-8 week post-operative visit with the
surgeon. The patients were directly observed during this visit and all activity and postural
changes were recorded for comparison with the activity monitor data. To further characterize the
participants, height, weight, knee range of motion and 10m walk speed were also measured.
Participants who were interested were then asked to wear an activity monitor over the next 7
days while they went about their normal routine.
Results/conclusions: The activPAL had significantly better accuracy in detecting sedentary
and upright postures (paired t-tests p<0.05). There was a significant difference in sedentary
predictive values (p<0.05) with the activPAL having a better predictive value. No significant
difference was found between monitors for upright predictive values. Ten participants spent an
average of 73.36% (+/- 10.77%) of monitor wear time in sedentary behaviours. This is more
than research has shown in healthy populations.
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Keywords
postural changes, sedentary behaviour, knee replacement