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. 2009 Apr 1;4(4):e4850. doi: 10.1371/journal.pone.0004850

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Data are from the lateral rectus (LR) of the second monkey (m3). A: Heartbeat noise templates at different muscle lengths. B: Magnitude of the heartbeat noise (average over the time interval indicated by the red bar in A) as a function of muscle length. A least-squares cubic fit to the data is shown in blue. C: Respiration noise templates at different muscle lengths. D: Magnitude of the respiration noise (average in the time interval indicated by the red bar in C) as a function of muscle length. A least-squares cubic fit to the data is shown in blue. E: Red: Part of the relaxation response measured in the same muscle after a quick step. Blue: Same as red trace, but after template-based removal of the heartbeat noise (shifted down by 1 gf for clarity). Green: same as blue trace, but after template-based removal of the respiration noise (shifted down by 2 gf for clarity). The green trace is the denoised data used in all subsequent analyses.