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| Effect of Water Replenishment and Salt Replenishment Combined with Auxiliary Cooling Measure on Heat Stress Response |
| GU Liqun1, HAN Yuming2, LI Yuan1, LIU Shuyuan3, NING Bo4 |
1. Critical Care Medicine, Beijing Chaoyang Emergency Medical Center, Beijing 100021, China;
2. Emergency Department Ward No. 1, Beijing Chaoyang Integrative Medicine Emergency Medical Center, Beijing 100021, China;
3. Emergency Department, The Sixth Medical Center of PLA General Hospital, Beijing 100148,China;
4. Critical Care Medicine, Air Force Medical Center of PLA, Beijing 100142,China |
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Abstract Objective Training in high temperature environment, participants are prone to excessive heat stress with thermal damage to tissues.One of the main causes for heat stroke is high core temperature resulting of dehydration and hyponatremia during the training.This study was intend to find effective methods to prevent heat stroke during high-temp training by verifying the effect of water replenishment and salt replenishment combined with auxiliary cooling measures on heat stress response.Methods Participants were (62) male soldiers with 1 or 2 years training experience in the army. The training programs were 5 km and 10 km outdoor running. The Environmental heat index was 40~42. Up-front water replenishment and salt replenishment:30 minutes before running, the experimental group was given 500ml of 60mmol/L sodium chloride solution. Every 400 meters during the running, soaked 20 ℃ water with sponge and pour the water on the runners’ heads once meanwhile 20℃ water spraying to cool the whole body for 3 seconds. Physiological strain index (PSI), sweat volume and sodium loss were compared between the 5 km running group (n=20) and the control group (n=21), as well as comparison between the 10km running group (n=10) and the control group (n=11).Results There were significant differences in PSI, sweat volume between the experimental group and the control group. The data was statistically significant (P<0.05). There was a significant difference in PSI between 5km running and 10 km running. The data was statistically significant (P<0.05). The comparisons of the maximum heart rates were not statistically significant (P<0.05).Conclusion Water replenishment and salt replenishment combined with auxiliary cooling measurescan reduce PSI and dehydration, thus preventing heat stroke.
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Received: 07 May 2022
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2022, Vol. 33 
