Document Type
Article
Subject Area(s)
Public Health
Abstract
Purpose: This study was designed to validate the Actical activity monitor in middle-aged and older adults of varying body composition to develop accelerometer thresholds to distinguish between light and moderate intensity physical activity (PA).
Methods: Nonobese 45 to 64 yr (N = 29), obese 45 to 64 yr (N = 21), and ≥65 yr (N = 23; varying body composition) participants completed laboratory-based sitting, household, and locomotive activities while wearing an Actical monitor and a portable metabolic measurement system. Non-linear regression analysis was used to identify activity count (AC) cut-points to differentiate between light intensity (<3 METs) and moderate intensity (≥3 METs) PA.
Results: Using group-specific algorithms, AC cut points for 3 METs were 1634, 1107, and 431 for the obese 45 to 64 yr group, nonobese 45 to 64 yr group, and ≥65 yr group, respectively. However, sensitivity and specificity analysis revealed that an AC cut-point of 1065 yielded similar accuracy for detecting an activity as less than or greater than 3 METs, regardless of age and body composition.
Conclusion: For the Actical activity monitor, an AC cut-point of 1065 can be used to determine light and moderate intensity PA in people ≥45 years of age.
Publication Info
Published in Journal of Physical Activity and Health, Volume 8, Issue 3, 2011, pages 372-381.
Hooker, S. P., Feeney, A., Hutto, B., Pfeiffer, K. A., McIver, K., Heil, D. P., ... Blair, S. N. (2011). Validation of the actical activity monitor in middle-aged and older adults. Journal of Physical Activity and Health, 8(3), 372-381.
© Journal of Physical Activity and Health, 2011, Human Kinetics
Rights
Hooker, S. P., Feeney, A., Hutto, B., Pfeiffer, K. A., McIver, K., Heil, D. P., ... Blair, S. N. (2011). Validation of the actical activity monitor in middle-aged and older adults. Journal of Physical Activity and Health, 8(3), 372-381.
© Journal of Physical Activity and Health, 2011, Human Kinetics