Reply to Dumke, C. Comment on “Fan et al. Efficacy of Ingesting an Oral Rehydration Solution after Exercise on Fluid Balance and Endurance Performance. Nutrients 2020, 12, 3826”
1
Human Potential Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore S119228, Singapore
2
Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore S117593, Singapore
3
Global Asia Institute, National University of Singapore, Singapore S119076, Singapore
4
N.1 Institute for Health, National University of Singapore, Singapore S117456, Singapore
5
Institute for Digital Medicine, National University of Singapore, Singapore S117456, Singapore
6
DSO National Laboratories, Defence Medical and Environmental Research Institute, Singapore S117510, Singapore
7
National Institute of Education, Nanyang Technological University, Singapore S637616, Singapore
*
Author to whom correspondence should be addressed.
Nutrients 2021, 13(9), 3215; https://doi.org/10.3390/nu13093215
Submission received: 30 July 2021
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Accepted: 13 September 2021
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Published: 16 September 2021
We would like to thank Dr. Charles Dumke for taking interest in our recent publication [1]. In our study, we aimed to investigate the rehydration efficacy of ingesting an oral rehydration solution during post-exercise recovery followed by a pre-load time trial performance. Dr. Dumke provided comments about the presentation of data, extrapolation of results and external validity.
Firstly, Dr. Dumke mentioned an error in the presentation of fluid retention data in Figure 1b. This was an oversight on our part and we have submitted a correction.
Secondly, it was pointed out that one should not extrapolate the effectiveness of oral rehydration solutions from promoting rehydration after diarrhoea to during exercise in the heat. We agree and no such extrapolation was made in our paper. It is noteworthy that, while Dr. Dumke’s previous study investigated fluid retention during exercise [2], our study was designed to represent individuals who may have to execute two exercise sessions within a day. Therefore, we were interested in fluid retention during a post-exercise recovery phase. That may explain the difference in the fluid retention results between the two studies [1,2].
Lastly, Dr. Dumke questioned the external validity of the current study in the case of workers and athletes on the field. While we argued that our design “mimicked the lifestyle of elite endurance athletes and soldiers where two bouts of exercises can often be completed within a single day” [1], there is validity in that the extra fluid retention is promoted only “in the absence of ingestion of any other nutrition” within 5 h of passive recovery. Nonetheless, our study methodology to deduce hydration efficacy was based on fluid retention following post exercise fluid replenishment is in line with several post exercise rehydration studies [3,4,5]. Therefore, this does not invalidate the experimental demonstration of the effectiveness of the oral rehydration solution.
Author Contributions
Writing—original draft preparation, J.K.W.L.; writing—review and editing, J.K.W.L., P.W.F. and S.F.B. All authors have read and agreed to the published version of the manuscript.
Funding
This research was funded by Ministry of Defence, Singapore, grant number 9009106183.
Conflicts of Interest
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.
References
- Fan, P.W.; Burns, S.F.; Lee, J.K.W. Efficacy of Ingesting an Oral Rehydration Solution after Exercise on Fluid Balance and Endurance Performance. Nutrients 2020, 12, 3826. [Google Scholar] [CrossRef] [PubMed]
- Schleh, M.W.; Dumke, C.L. Comparison of sports drink versus oral rehydration solution during exercise in the heat. Wilderness Environ. Med. 2018, 29, 185–193. [Google Scholar] [CrossRef] [Green Version]
- Shirreffs, S.M.; Watson, P.; Maughan, R.J. Milk as an effective post-exercise rehydration drink. Br. J. Nutr. 2007, 98, 173–180. [Google Scholar] [CrossRef] [Green Version]
- Evans, G.H.; Shirreffs, S.M.; Maughan, R.J. Postexercise rehydration in man: The effects of osmolality and carbohydrate content of ingested drinks. Nutrition 2009, 25, 905–913. [Google Scholar] [CrossRef] [PubMed]
- Merson, S.J.; Maughan, R.J.; Shirreffs, S.M. Rehydration with drinks differing in sodium concentration and recovery from moderate exercise-induced hypohydration in man. Eur. J. Appl. Physiol. 2008, 103, 585–594. [Google Scholar] [CrossRef] [PubMed]
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MDPI and ACS Style
Lee, J.K.W.; Fan, P.W.; Burns, S.F. Reply to Dumke, C. Comment on “Fan et al. Efficacy of Ingesting an Oral Rehydration Solution after Exercise on Fluid Balance and Endurance Performance. Nutrients 2020, 12, 3826”. Nutrients 2021, 13, 3215. https://doi.org/10.3390/nu13093215
AMA Style
Lee JKW, Fan PW, Burns SF. Reply to Dumke, C. Comment on “Fan et al. Efficacy of Ingesting an Oral Rehydration Solution after Exercise on Fluid Balance and Endurance Performance. Nutrients 2020, 12, 3826”. Nutrients. 2021; 13(9):3215. https://doi.org/10.3390/nu13093215
Chicago/Turabian StyleLee, Jason Kai Wei, Priscilla Weiping Fan, and Stephen F. Burns. 2021. "Reply to Dumke, C. Comment on “Fan et al. Efficacy of Ingesting an Oral Rehydration Solution after Exercise on Fluid Balance and Endurance Performance. Nutrients 2020, 12, 3826”" Nutrients 13, no. 9: 3215. https://doi.org/10.3390/nu13093215
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