Table 3.
Physical activity and sedentary behavior estimates using data from vertical axis only and from vector magnitude assessment, Women's Health Study, 2011-2013
| Assessment method: | Sedentary a (min/d) | Light-intensity b (min/day) | MVPA c (min/day) | |||
|---|---|---|---|---|---|---|
| Vertical axis | Vector magnitude | Vertical axis | Vector magnitude | Vertical axis | Vector magnitude | |
| Detailed-log | 598.7 (537.3, 656.9) | 518.5. (453.4, 585.3) | 277.2 (227.6, 330.7) | 343.8 (283.9, 404.0) | 8.9 (2.7, 21.1) | 19.7 (8.0, 37.7) |
| Limited-log + Troiano [5] | 530.1 (480.1, 578.6) | 474.6 (417.0, 529.6) | 290.4 (242.2, 342.7) | 358.7 (300.2, 418.4) | 9.6 (3.0, 22.3) | 20.7 (8.7, 38.7) |
| Limited log + Choi [11, 19] | 581.6 (521.1, 639.8) | 506.0 (439.2, 570.9) | 287.9 (238.7, 340.7) | 357.4 (297.4, 417.6) | 9.4 (3.0, 22.1) | 20.6 (8.7, 38.6) |
Note: All differences between vertical axis and vector magnitude (VM) were statistically significant P < 0.001. Includes all participants with at least 1 valid day (≥10 h wear-time) for particular assessment method.
aSedentary time is defined as time during which the accelerometer registers vertical cpm <100 [21] and VM cpm <200 [18].
bLight-intensity physical activity time is defined as time during which the accelerometer registers vertical cpm between 100 and 1951 [12] and VM cpm between 150 and 2690 [22].
cMVPA time is defined as time during which the accelerometer registers vertical cpm > = 1952 [12] and VM cpm > = 2691 [22].