Abstract
BackgroundFew studies to date have directly compared the Actigraphs GT1M and the GT3X, it would be of tremendous value to know if these accelerometers give similar information about intensities of PA. Knowing if output is similar would have implications for cross-examination of studies. The purpose of the study was to assess the validity of the GT1M and the GT3X Actigraph accelerometers for the assessment of physical activity against oxygen consumption in laboratory conditions.MethodsForty-two college-aged participants aged 18-25 years wore the GT1M and the GT3X on their right hip during treadmill exercise at three different speeds, slow walking 4.8 km.h-1, fast walking 6.4 km.h-1, and running 9.7 km.h-1). Oxygen consumption was measured minute-by minute using a metabolic system. Bland-Altman plots were used to assess agreement between activity counts from the GT3X and GT1M, and correlations were assessed the ability of the accelerometers to assess physical activity.ResultsBias for 4.8 km.h-1 was 2814.4 cpm (limits 1211.3 to 4417.4), for 6.4 km.h-1 was 3713.6 cpm (limits 1573.2 to 5854.0), and for 9.7 km.h-1 was−3811.2 cpm (limits 842.1 to 6780.3). Correlations between counts per minute for the GT1M and the GT3X were significantly correlated with VO2 (r = 0.881, p < 0.001; r = 0.810, p < 0.001 respectively).ConclusionThe present study showed that both the GT1M and the GT3X accurately measure physical activity when compared to oxygen consumption.
Highlights
Few studies to date have directly compared the Actigraphs GT1M and the GT3X, it would be of tremendous value to know if these accelerometers give similar information about intensities of physical activity (PA)
Correlations between counts per minute for the GT1M and the GT3X were strongly positively and statistically significantly correlated (r = 0.937, p < 0.001). Both the GT1M and the GT3X accelerometers count/minute were significantly positively correlated with VO2 (r 0.881, p < 0.001; r = 0.810, p < 0.001 respectively)
While results from other studies showed that triaxial accelrometers measured physical activity and energy expenditure in adults and children more accurately than uniaxial accelerometers [42,43], our results show that the additional information obtained from 3 dimensional movements is not more efficient or more accurate than the uniaxial accelerometer when compared to oxygen consumption
Summary
Few studies to date have directly compared the Actigraphs GT1M and the GT3X, it would be of tremendous value to know if these accelerometers give similar information about intensities of PA. The purpose of the study was to assess the validity of the GT1M and the GT3X Actigraph accelerometers for the assessment of physical activity against oxygen consumption in laboratory conditions. The increase in accelerometry use may be a result for the need of accurate and objective techniques. One of the most widely used accelerometers in PA research is the Actigraph’s Uniaxial GT1M (Actigraph, Pensacola, FL) and more recently the company released the triaxial GT3X (Actigraph, Pensacola, FL) [3]. These accelerometers are based on differential capacitance sensor
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