Article

Limited data support the strong association between rates of accelerometer
activity counts and energy expenditure during dynamic activity in persons with
multiple sclerosis (MS). This study examined the association between rates of
activity counts and energy expenditure during walking by using two models of
accelerometers and generated cut-points representing moderate-to-vigorous
physical activity (MVPA) in persons with MS. Participants were 43 persons with MS
and 43 controls who undertook 5 min of seated rest and up to five 6 min periods
of walking at five different speeds on a treadmill. While walking, participants
wore two models of accelerometers and a mouthpiece in-line with an open-circuit
spirometry system for measuring energy expenditure
(rate of oxygen consumption).
Strong linear associations were found between accelerometer activity counts and
energy expenditure, and the magnitude did not differ between MS and controls for
both accelerometer models. The mean slopes of the linear relationships were
steeper in persons with MS than controls and resulted in distinct cut-points for
MVPA based on accelerometer counts for persons with MS and controls. The strong
linear relationship between activity counts and energy expenditure and cut-points
for quantifying time spent in MVPA should allow for better understanding of
physical activity and examination of its predictors and consequences when using
accelerometers in MS.

Langue : ANGLAIS