Abstract
The aim of the study was to examine changes in objective and self-reported physical activity (PA) among women aged 60 years and older. The study included 200 women aged over 60 years, divided into three groups according to age (60–65 years, 66–70 years, > 70 years). The subjective assessment was provided with the International Physical Activity Questionnaire (IPAQ) – short version with self-reported PA assessment, and objective data was provided by an Actigraph GT3-BT worn for seven days. Significant differences in moderate and high intensity PA, moderate-to-vigorous PA and steps per day were found between the oldest and youngest groups; as well as in low, moderate, moderate-to-vigorous PA and steps per day between groups middle and oldest. In all three age groups, 1) significant differences were observed between subjective and objective measurements of physical activity and 2) no correlation was found between assessment measures. It was found that only direct PA measurement declined with age in women over 60 years old, and that sedentary behavior is underestimated, and moderate and vigorous PA overestimated, with the self-reported IPAQ.
Highlights
Measuring the physical activity (PA) of older adults is a challenge for researchers (Sun et al, 2013)
Group one, differed significantly from group three in terms of moderate and vigorous intensity PA, Moderate-to-vigorous physical activity (MVPA), and steps per day measured by the accelerometer
Groups two and three differed significantly with regard low and moderate intensity PA, MVPA and steps per day measured by the accelerometer
Summary
Measuring the physical activity (PA) of older adults is a challenge for researchers (Sun et al, 2013). Self-reported measurement offers information about how the older adult personally assesses activity intensity, whereas objective tools provide externally-quantified information, such as energy expenditure, recorded steps and activity duration. Both forms of assessment offer distinct advantages and disadvantages. A direct measurement option, are becoming increasingly popular in studies with older adults experience execution issues (Bento et al, 2012; Davis & Fox, 2007; de Bruin et al, 2008; Garatachea et al, 2010; Murphy, 2009; Taraldsen et al, 2012) Such concerns include the variety of monitoring devices, the lack of standard protocols, and the considerable variability in the parameters obtained from the devices. A secondary aim was to evaluate the relationship between direct and indirect measurement of PA across the three age groups
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