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Protocol for Objective Measurement of Infants' Physical Activity using Accelerometry.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Ricardo, Luiza Isnardi Cardoso 
DA Silva, Inácio Crochemore Mohnsam 
Martins, Rafaela Costa 
Wendt, Andrea 
Gonçalves, Helen 

Abstract

PURPOSE: This study aimed to evaluate methods for infants' physical activity measurement based on accelerometry, including the minimum number of measurement days and placement of a wrist or ankle device. We also evaluated the acceptability of the device among infants and mothers. METHODS: A cross-sectional mixed-methods study was conducted on a convenience sample of 90 infants. Physical activity was measured using the Actigraph GT3X+ accelerometer placed on the wrist and/or ankle for 7 consecutive days (worn for 24 h), and a qualitative interview was performed to verify acceptability. The intraclass correlation coefficient (ICC) method and the Bland and Altman's dispersion diagram were used to verify the minimum number of measurement days. All analyses were stratified by walking status. RESULTS: The mean (SD) age was 12.9 (1.70) months; the mean acceleration varied between 25.8 mg (95% confidence interval (CI), 14.3-52.7) and 27.3 mg (95% CI, 17.9-44.5) using the wrist placement, and between 24.9 mg (95% CI, 10.6-48.4) and 26.2 mg (95% CI, 11.7-65.6) using the ankle placement. The ICC results showed a lower acceleration variability between days among infants incapable of walking; they achieved an ICC of 0.80 with 1 d of measurement in both placements. Among those capable of walking, the minimum number of days to achieve an ICC of 0.80 was 2 d measured at the wrist (0.85; 95% CI, 0.71-0.93) and 3 d measured at the ankle (0.92; 95% CI, 0.84-0.96). The qualitative results pointed to the wrist placement as the preferred placement among the overall sample. CONCLUSIONS: Two and three measurement days with the accelerometer placed on the wrist and ankle, respectively, seemed to adequately represent a week of measurement. The accelerometer placed on the wrist had better acceptance by the infants and mothers.

Description

Keywords

Acceleration, Actigraphy, Ankle, Cross-Sectional Studies, Exercise, Female, Humans, Infant, Male, Walking, Wrist

Journal Title

Med Sci Sports Exerc

Conference Name

Journal ISSN

0195-9131
1530-0315

Volume Title

50

Publisher

Ovid Technologies (Wolters Kluwer Health)