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. 2021 Jun 28;11:13417. doi: 10.1038/s41598-021-92929-y

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© The Author(s) 2021

Open Access This 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/.

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Pre- and post-performance in eccentric torque and work measured with the isokinetic device (left: a,c; right: b,d) and the Nordic hamstring device (left: e,g; right: f,h) and the relation of obtained torque (i,k) and work (j,l) changes over time. Values are mean ± SD. IG, isometric group; NG, Nordic hamstring group; CG, control group; IKD, isokinetic device; NHD₃₀, Nordic hamstring test at a lean forward velocity of ~ 30°·s-1. # for the significant group effect, with post-hoc differences between groups shown by squares (significantly different from IG), triangles (significantly different from NG), and circles (significantly different from CG); † for the significant time effect; ‡ significant interaction effect. Further, each subgroup was analysed independently (paired sample t-test); *, P < .05, **, P < .01, ***, P < .001.