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. 2021 Nov 29;12:756805. doi: 10.3389/fphys.2021.756805

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Copyright © 2021 Walsh, McAndrew, Henness, Shemmell, Cuicuri and Stapley.

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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(A) The original Monark 837E recumbent ergometer. (B) The modified semi-recumbent ECC cycle ergometer with the replacement chassis was installed on to the original frame. Start and stop buttons, locking system, HMI display screen, and pedal direction are all shown. (C) The mechanical contents housed in the new chassis (motion controllers, left and right servo drives). The insert shows the independent closed loop system, tension idlers, electric motor, and belt drive attached to the crank pulley (left side only, replicated on right side – not shown).