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. 2018 Dec 22;19(1):38. doi: 10.3390/s19010038

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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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Model picture of the instrumentation with the retroreflective markers and inertial measurement units (IMU). The IMUs were inserted into matched rigid boxes for additional analysis not relevant in the present examination. The markers used for the identification of the initial contact (IC) and terminal contact (TC) events are marked. The calcaneus (CA) markers were used to identify IC, the first distal phalanx (DP1) markers were used to identify the TC in the optical system. In the IMU system virtual representations of the CA and first metatarsal (FM) markers were used to identify the events (see Figure 3). Right Anterior Spina Iliaca Superior (RASIS), Left Anterior Spina Iliaca Superior (LASIS), Right Posterior Spina Iliaca Superior (RPSIS) and Left Posterior Spina Iliaca Superior (LPSIS) markers were used to define the pelvic coordinate system. Consider that in the actual study the above mentioned relevant markers were attached directly onto the skin rather than on clothing.