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. 2019 Jul 23;10:910. doi: 10.3389/fphys.2019.00910

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Copyright © 2019 Schaefer and Bittmann.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic diagram of the pneumatic measuring system “SeBit knee.” The push rod of the cylinder (∅ 12.57 cm²) is equipped with a man machine interface. The cylinder is connected with a compressor (Jun-Air, Agre Kompressor Hobby Star 200, max. 8 bar), which can be controlled by a control unit. The input-box including an A/D-converter (14-bit) transmits the signal of the pressure sensor to the measuring notebook containing the software NI DIAdem 10.2. The value of pressure serves as biofeedback to adjust the pre-pressure during the measuring of explosive Adaptive Force (xpAF) (Hoff et al., 2015; Schaefer et al., 2017).