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. 2020 Sep 29;12:60. doi: 10.1186/s13102-020-00208-6

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Development of the transitory force decrease at an increasing number of pulses with high-frequency stimulation. a, a set of sample recordings of single fast resistant contractions evoked by five trains of pulses including one, two, four, six, and 18 short interpulse intervals of 11.1 ms. Low frequency stimulation: 35 Hz; high frequency stimulation: 90 Hz. b, amplitude of the transitory force decrease as a function of the number of short intervals. All data for one set of recordings (obtained at low-frequency stimulations of 35 Hz and 40 Hz for all 8 examined MUs) are connected. The black line illustrates motor unit presented left. The red line presents mean values; * p < 0.01 in relation to one short interpulse interval