Accelerometers used:
(1) 3dNX (triaxial)
(2) CSA model 7164 (MTI accelerometer, uniaxial)
(3) Actigraph GT1M (uniaxial)
(4) ActiHeart (uniaxial)
Parameters:
(1) heart rate in beats per minute
(2) output from the accelerometer in counts per minute (CPM)
Equations for walking while wearing the 3dNX on the left hip:
oxygen uptake in mL per kg per minute =
= (0.244 * (heart rate)) - 5.614
oxygen uptake in mL per kg per minute =
= (0.02315 * (CPM)) + 5.258
oxygen uptake in mL per kg per minute =
= (0.02027 * (CPM)) + (0.07105 * (heart rate)) + 0.161
Equations for running while wearing the 3dNX on the left hip:
oxygen uptake in mL per kg per minute =
= (0.321 * (heart rate)) - 6.387
oxygen uptake in mL per kg per minute =
= (0.02573 * (CPM)) - 1.014
oxygen uptake in mL per kg per minute =
= (0.01942 * (CPM)) + (0.123 * (heart rate)) - 9.371
The equations for the other 3 accelerometers for use while walking are given in Table 3, page 196.
