Funded in part by Otsuka Pharmaceutical Factory, Otsuka Pharmaceutical, Otsuka Pharmaceutical Factory, Inc.
Water intake after dehydration makes muscles more susceptible to cramp but electrolytes reverse that effect
Lau WY, Kato H, Nosaka K
BMJ open sport & exercise medicine · 19 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Industry funded
- Company
- Otsuka Pharmaceutical Factory
- Company
- Otsuka Pharmaceutical
- Company
- Otsuka Pharmaceutical Factory, Inc.
Based on 3 listed funder(s).
Publication
- Published
- 2019-03-01 · BMJ Open Sport Exerc Med · vol. 5 · issue 1 · p. e000478
- Publisher
- BMJ
- Cited
- 30 citations · more than 86% of similar papers · 2.0× the field average
- References
- 21 works
- Access
- Open access (journal) · CC-BY-NC
- Research areas
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Body Composition Measurement Techniques
- Keywords
- Dehydration, Water intake, Medicine, Physical medicine and rehabilitation, Food science, Psychology, Chemistry, Internal medicine, Biochemistry
3 authors
From AU, JP
- Wing Yin LauEdith Cowan University
- Haruyasu KatoRikkyo University
- Kazunori Nosaka · correspondingEdith Cowan University
Abstract
Objective
No previous study has compared water and oral rehydration solution (ORS) intake after dehydration induced by exercise in the heat for the effect on muscle cramps. The present study tested the hypothesis that water ingestion after dehydration would increase muscle cramp susceptibility, but this would be prevented by ORS ingestion.
Methods
Ten men performed two bouts of downhill running (DHR; -5%) in the heat (35°C-36 °C) until their body mass was reduced by 2%. Ten minutes after DHR, either spring water or electrolyte water similar to ORS (OS-1®) was ingested in a counter-balanced order on two different days separated by a week. Muscle cramp susceptibility was assessed by a threshold frequency (TF) of electrical train stimulation to induce cramp before, immediately after (0), and 30 and 60 min after the ingestion. Blood samples were taken before, immediately and 80 min after DHR to measure serum electrolyte concentrations.
Results
Muscle cramp susceptibility assessed by TF did not change from baseline to immediately after DHR for both conditions (water: 24.6 ± 2.1 Hz, OS-1®: 24.7 ± 1.4 Hz). TF decreased after water intake by 4.3 Hz (30 min) and 5.1 Hz (60 min post-ingestion), but increased after OS-1® intake by 3.7 and 5.4 Hz, respectively. Serum sodium and chloride concentrations decreased after water intake but maintained after OS-1® intake.
Conclusion
These results suggest that water intake after dehydration makes muscles more susceptible to electrical simulation-induced muscle cramp, probably due to dilution of electrolytes, and when OS-1® is consumed, the susceptibility to muscle cramp decreases.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY-NC).
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