Response to: gender differences on neuromuscular strategy during drop jump: a comment on Helm et al. (2019) by Di Gimini
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Response to: gender differences on neuromuscular strategy during drop jump: a comment on Helm et al. (2019) by Di Giminiani et al. M. Helm1 · K. Freyler1 · J. Waldvogel1 · A. Gollhofer1 · R. Ritzmann1,2 Received: 31 July 2020 / Accepted: 4 August 2020 © The Author(s) 2020
Dear Editor, We are very grateful to receive the comment from Di Giminiani et al. (2020). Based on the previously described gender differences, they suggest that we should clarify if sex specificity exists in kinetic, kinematic and motor control strategies in the stretch–shortening cycle (SSC) in our study. Although sex specificity was not the major hypothesis-driven interest of our study, we found the recommendation relevant for our research. Therefore, we decided to recalculate the statistics according to the author’s suggestions to verify or neglect gender differences. Thereby, we have included gender as a between-subject factor to the two-factor repeated measures analysis of variance (rmANOVA) [anticipation (2) × drop height (3)], because gender does not match the requirements of an ANCOVA (covariate: metric scale level). This extended statistical analyses show no statistically significant effect of gender, neither the interaction gender * drop height nor the interaction gender * anticipation regarding the performance parameters, the kinematics, the kinetics and the Communicated by Westerterp/Westerblad. Response to a comment on: Helm M, Freyler K, Waldvogel J, Gollhofer A, Ritzmann R (2019). The relationship between leg stiffness, forces and neural control of the leg musculature during the stretch-shortening cycle is dependent on the anticipation of drop height. Eur J Appl Physiol 119:1981–1999. https://doi. org/10.1007/s00421-019-04186-7. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00421-020-04460-z) contains supplementary material, which is available to authorized users. * K. Freyler [email protected]‑freiburg.de 1
Institute of Sport and Sport Science, University of Freiburg, Schwarzwaldstraße 175, 79117 Freiburg, Germany
Rennbahnklinik, Muttenz, Switzerland
2
EMG activity in seven of the eight measured muscles. The only exception is the EMG activity of the VM during the SLR phase (see Supplementary Tables 1–3). Hence, all the other muscles and phases as well as the mechanical parameters are unaffected by gender during the SSC. The SSC is characterized by a stretching of a pre-activated muscle–tendon unit, immediately followed by a contraction of the muscle (Komi 1984). Regarding the role of different leg muscles during the SSC, the VM muscle serves as a knee extensor. However, it has been documented that the most relevant muscles within the SSC are in particular the triceps surae muscles serving as plantarflexors, which, together with the Achilles tendon, are the primary players allowing to efficiently store and release elastic energy (Komi and Gollhofer 1997; Arampatzis et al. 2001). Based on this, and including that the task instruction was to keep a st
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