Effect of Oral Rehydration Solution on Fatigue during Outdoor Work in a Hot Environment: A Randomized Crossover Study

Abstract

Effect of Oral Rehydration Solution on Fatigue during Outdoor Work in a HotThe effects of an oral rehydration solution (ORS) on fatigue were studied in workers engaged in manual work during the summer. Methods: One hundred and fifty-three workers engaged in loading cargo onto aircraft at Tokyo International Airport who consented to participate in the study were the subjects. The study was carried out on two summer days with fine weather during the daytime shift. The subjects were randomly divided into two groups: with one group restricted to ORS intake and the other group having free-choice of their favorite drink (FAD) in a randomized crossover study. The subjects were asked about the amount of beverage that they consumed and the type of FAD that they chose on the days of the survey. The effects of the ORS and the FAD were compared using a visual analogue scale (VAS) to determine the degree of fatigue experienced immediately after completing work. Results: The average wet bulb globe temperature (WBGT) on the survey days was 30°C. The beverage intake during work was 1,000 ml for most participants and the most commonly chosen types of FAD were tea and coffee. The fatigue VAS was significantly lower on the ORS intake days than on the FAD intake days (50.0 ± 18.3 vs. 53.9 ± 16.3). Conclusions: The results of this study suggest that the intake of ORS during outdoor work in a hot environment would be effective for preventing industrial accidents and heat stroke. It is important to select an appropriate drink to ensure adequate intake of water and electrolytes. (J Occup Health 2010; 52: 209-215)

Renoprotective effect of oral rehydration solution III in exertional heatstroke rats

“…Hypohydration not only increased physiologic strain, decreased exercise, but also caused heat acclimation [19]. The possible kidney protective mechanisms of ORS III were in the following ways: firstly, in clinical practice, oral rehydration therapy had proved to be effective [13]. Intake of ORS III was a good way to replace the fluid-losing during exercise, and sufficient water could improve kidney perfusion, which reduced the ischemic damage in kidney.…”

“…ORS III promotes water absorption via the sodium-dependent glucose co-transporter 1 (SGLT1) in villous cells of the small intestine [12]. The molar ratio of sodium to glucose in ORS III is 1:2, which is ideal for the intestinal absorption of electrolytes and water [13].…”

Yogurt Drink Effectively Rehydrates Athletes After a Strenuous Exercise Session

“…Tea has been shown not to be more effective than plain water in rehydration and restoring uid balance after exercise [15][16][17][18]. There is insuf cient evidence supporting a superior rehydrating potential of coffee compared with other drinks [19]. Moreover, the current evidence does not suggest superior rehydration potential of juice in comparison with plain water [20,21].…”

Oral Salt and Water versus Intravenous Saline for the Prevention of Acute Kidney Injury following Contrast-Enhanced Computed Tomography: Study Protocol for a Pilot Randomized Trial

“…Oral salt and water solutions are well tolerated and effective in prevention and treatment of dehydration [20][21][22][23]. Mechanistic studies have also established that oral sodium and water loading results in rapid (within 20 minutes) changes in physiology with a significant increase in cardiac output and subsequent diuresis [24][25][26].…”