Article

The ActivPAL device is a well-established physical activity monitor for
assessment of physical activity. AIM: To investigate test-retest reliability of
step counts and establish minimal detectable changes (MDC) in step count to
account for intra device error over time in various physical activities. METHODS:
Healthy participants (n=24, age range, 19-28 years) performed activities on two
occasions, 1 week apart, in a laboratory setting; self-paced floor walking,
treadmill walking at three different speeds (3.2 km/h, 4.5 km/h and 4.5 km/h with
incline), treadmill jogging (8.0 km/h), stair walking and cycling on an exercise
bike at three speeds (45 rpm, 60 rpm and 75 rpm). Relative reliability was
calculated using intraclass correlation coefficient (ICC) and Spearman
correlation. Absolute reliability was assessed using standard error of
measurement (SEM) and coefficient of repeatability (CR). RESULTS: The ActivPAL
showed high to very high relative reliability for treadmill walking at all speeds
and stair walking, while self-paced normal floor walking showed moderate
reliability. The absolute reliability was the best for treadmill walking
activities, slightly increased for self-paced walking, followed by stair walking
and jogging. The use of activity monitors during cycling has been questioned and
our results confirm a low absolute and relative reliability. MDC values varied
according to the type of activity e.g. treadmill walking 4.5 km/h (10 steps),
walking on the floor (45 steps). Data loss in this study (10-13%) was higher than
previously reported. CONCLUSIONS: The ActivPAL is reliable for treadmill walking,
jogging and self-paced walking. MCD varies according to the activity and should
be considered when establishing true change over time.
CI - Crown Copyright (c) 2010. Published by Elsevier B.V. All rights reserved.

Langue : ANGLAIS