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• W2883702941 abstract "Dear Editor-in-Chief, We read with interest the recent work of Broxterman et al. (1). Their findings shed light on the role of group III/IV muscle afferents in skeletal muscle bioenergetics and ATP synthesis, in particular the magnitude and rate of metabolic perturbation, which is apparently due to the increased ATP cost of muscle actions. They offered speculation regarding the effect of group III/IV muscle afferents on motor unit recruitment strategies and asserted that this may explain their findings. Further, they also argue that their results provide evidence that afferent feedback modulates perception of effort during exercise and evidence against the corollary discharge model. However, we would like to offer an alternative interpretation. First, group III/IV muscle afferents are also involved in nociception and thus may be involved in perception of discomfort/pain during exercise (2). This is important as the RPE results reported may result from the effect of intrathecal fentanyl on pain perception. Broxterman et al. used Borg’s CR-10 scale but provided no information on how it was administered or explained to the participants. Indeed, based on their previous work, RPE may have been defined as “limb discomfort” (3). In tasks such as the one they used (low load isometric knee extension to momentary failure), which resembles resistance training–type modalities, most people have difficulty in differentiating their perceptions of effort from their perceptions of discomfort/pain unless the scale is clearly explained. Our group’s work predominantly involves resistance training, and we have discussed this at length in previous publications (4–6). Yet, even some studies that have not explicitly differentiated effort and discomfort report similar or higher perceived effort when using pharmacological blockades (7). We speculate that Broxterman et al. are correct in their suggestion that group III/IV afferents may play an indirect role in skeletal muscle metabolism because of their effects on motor unit recruitment strategies. However, we also think that an argument can be made whereby both corollary discharge and afferent feedback are involved in perception of effort through both direct and indirect mechanisms. Henneman’s Size Principle would predict that at momentary task failure at the same relative task demands, a similar proportion of the motor unit pool should have been recruited to meet those demands. If afferent feedback is affecting motor unit firing rates, then a greater number of motor units will need to be recruited to maintain the required force for the task. This necessitates an increased central motor command, particularly as further motor units are likely to be higher threshold because of orderly recruitment. As such, we speculate that had they used appropriate tools to differentiate effort and discomfort, the authors would have seen maximal, or near maximal, perceptions of effort in both conditions yet lower perceptions of discomfort in the intrathecal fentanyl condition. A task failure effort would likely be maximal in both conditions because of central motor command (corollary discharge), although motor unit recruitment strategies may differ between conditions because of the effects of group III/IV afferents, and discomfort/pain may differ due to the role they also play in nociceptive feedback. James Steele James Fisher School of Sport, Health, and Social Sciences Southampton Solent University Southampton, UNITED KINGDOM" @default.
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• W2883702941 date "2018-08-01" @default.
• W2883702941 modified "2023-09-23" @default.
• W2883702941 title "Effort, Discomfort, Group III/IV Afferents, Bioenergetics, and Motor Unit Recruitment" @default.
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• W2883702941 doi "https://doi.org/10.1249/mss.0000000000001605" @default.
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