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. 2018 Apr 1;18(4):1055. doi: 10.3390/s18041055

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Lower (left) and upper (right) body sensors selected for OPPORTUNITY dataset experiment. For the lower body sensors, we chose three triaxial accelerometers (marked in blue) located at the right hip (HIP), right knee (RKN^), and right knee (RKN_), and three inertial measurement units (marked in red) located at the right (R-SHOE) and left shoe (L-SHOE) for the experiments. For the upper body sensors, we chose six triaxial accelerometers located at the right upper arm (RUA^), right upper arm (RUA_), left upper arm (LUA^), left upper arm (LUA_), left wrist (LWR), and left hand (LH), and four inertial measurement units located at the right upper arm (RUA), right lower arm (RLA), left upper arm (LUA), and left lower arm (LLA).