Effect of Water Replenishment and Salt Replenishment Combined with Auxiliary Cooling Measure on Heat Stress Response

GU Liqun; HAN Yuming; LI Yuan; LIU Shuyuan; NING Bo

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Medical Journal of the Chinese People Armed Police Forces ›› 2022, Vol. 33 ›› Issue (6) : 533-536.

ORIGINAL ARTICLES

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

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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.

Key words

high temperature / exercise / heat stress response / sodium replenishment / water replenishment / auxiliary cooling body temperature

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GU Liqun, HAN Yuming, LI Yuan, LIU Shuyuan, NING Bo. Effect of Water Replenishment and Salt Replenishment Combined with Auxiliary Cooling Measure on Heat Stress Response[J]. Medical Journal of the Chinese People Armed Police Forces. 2022, 33(6): 533-536

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