Authors' Response

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Authors' Response:
The authors thank Ishøi et al. (3) for their interest in our article (4) and discussing their concerns about the main conclusion and some methodological aspects.
We agree that data synthesis based on counting significant and nonsignificant p values has major limitations as discussed elsewhere (1,2). For this reason, we initially aimed to perform a meta-analysis. However, 4 of 12 studies with mostly nonsignificant findings (and therefore a potential trivial true effect) did not provide enough information for a meta-analysis. The calculated effect could therefore overestimate the true effect, especially when considering publication bias. In their response, Ishøi et al. (3) performed a meta-analysis on a subset of the studies in our review while also separately analyzing different rates of force development (RFD) metrics. Although this analysis provides valuable information on the effect of training on different RFD metrics, this way of synthesizing data likely overestimates the true effect. In addition, they (1) did not distinguish in the training effects between untrained, recreationally active, or well-trained individuals, whereas such a distinction provides valuable information for practitioners working with better-trained individuals.
We acknowledge that different RFD metrics describe different physiological mechanisms, and a separate analysis per metric would indeed have provided a more detailed insight into the effects of resistance training on the underlying mechanisms. However, our perspective is that the overall effect of resistance training on RFD may be most interesting for practitioners because it is unknown that how a specific metric such as peak RFD relates to sports performance.
Finally, the authors understood from our conclusion that resistance training is ineffective at improving RFD and suggested that the conclusion be revised to “resistance training may in fact improve RFD during unloaded dynamic movements, at least for some RFD metrics.” Although the information about the effects of training on RFD metrics is a valuable addition, we would like to emphasize that our original conclusion indicated that resistance training may improve RFD during unloaded dynamic isoinertial multijoint movements. We did, however, suggest that the effect is limited, and the analysis of Ishøi et al. (3) supported this suggestion for some RFD metrics.
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