Objective: To examine the concurrent validity of the Technogym Active Key accelerometer against objective and subjective Physical Activity (PA) measures.
Design: Randomized, cross-sectional design with two phases. The laboratory phase compared the Active Key with the ActiGraph GT1M and the Yamax SW200 Digiwalker pedometer during treadmill graded walking increasing speed each minute. The free-living phase compared the Active Key with the ActiGraph, Digiwalker, Bouchard Activity Recall (BAR), and Global PA Questionnaire (GPAQ) for seven continuous days. Data were analyzed using Spearman rank-order correlation coefficients for all comparisons.
Setting: Laboratory and free-living phases.
Participants: Sixteen participants randomly stratified from 41 eligible respondents by sex (n=8 male; n=8 female) and PA levels (n=4 low), (n=8 middle), and (n=4 high active).
Main outcome measurements: N/A.
Results: There was a strong association between the Active Key and the ActiGraph accelerometer during controlled graded treadmill walking (r = 0.91, p < 0.01) and in free-living settings (r = 0.73 to 0.76 for light to vigorous PA, respectively, p < 0.01). No associations were observed between the Active Key and the BAR and GPAQ. (p > 0.05).
Conclusions: The Active Key has a high concurrent validity with the ActiGraph accelerometer to detect PA in both controlled laboratory and free living settings.
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