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Physiological tolerance to uncompensated heat stress in soldiers: effects of various types of body cooling systems.

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  • المؤلفون: Jovanović D; Karkalić R; Zeba S; Pavlović M; Radaković SS
  • المصدر:
    Vojnosanitetski pregled [Vojnosanit Pregl] 2014 Mar; Vol. 71 (3), pp. 259-64.
  • نوع النشر :
    Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
  • اللغة:
    English
  • معلومة اضافية
    • المصدر:
      Publisher: Military Medical Academy, INI Country of Publication: Serbia NLM ID: 21530700R Publication Model: Print Cited Medium: Print ISSN: 0042-8450 (Print) Linking ISSN: 00428450 NLM ISO Abbreviation: Vojnosanit Pregl Subsets: MEDLINE
    • بيانات النشر:
      Publication: <2013>- : Belgrade, Serbia : Military Medical Academy, INI
      Original Publication: Beograd : Institut Vojnomedicinski Dokumentaciju
    • الموضوع:
      Military Personnel*; Acclimatization/*physiology ; Heat Stress Disorders/*physiopathology ; Hot Temperature/*adverse effects ; Physical Exertion/*physiology ; Skin Temperature/*physiology; Adult ; Exercise Test ; Heat Stress Disorders/prevention & control ; Humans ; Male ; Protective Clothing
    • نبذة مختصرة :
      Background/aim: In military services, emergency situations when soldiers are exposed to a combination of nuclear, biological and chemical (NBC) contamination combined with heat stress, are frequent and complex. In these specific conditions, usage of personal body cooling systems may be effective in reducing heat stress. The present study was conducted in order to evaluate the efficiency of four various types of contemporary personal body cooling systems based on the "Phase Change Material" (PCM), and its effects on soldiers' subjective comfort and physiological performance during exertional heat stress in hot environments.
      Methods: Ten male soldiers were voluntarily subjected to exertional heat stress tests (EHSTs) consisted of walking on a treadmill (5.5 km/h) in hot conditions (40 degreesC) in climatic chamber, wearing NBC isolating impermeable protective suits. One of the tests was performed without any additional cooling solution (NOCOOL), and four tests were performed while using different types of cooling systems: three in a form of vests and one as underwear. Physiological strain was determined by the mean skin temperature (Tsk), tympanic temperature (Tty), and heart rate values (HR), while sweat rates (SwR) indicated changes in hydration status.
      Results: In all the cases EHST induced physiological response manifested through increasing Tty, HR and SwR. Compared to NOCOOL tests, when using cooling vests, Tty and Tsk were significantly lower (on 35th min, for 0.44 +/- 0.03 and 0.49 +/- 0.05 degrees C, respectively; p < 0.05), as well as the average SwR (0.17 +/- 0.03 L/m2/h). When using underwear, the values of given parameters were not significantly different compared to NOCOOL tests.
      Conclusions: Using a body cooling system based on PCM in the form of vest under NBC protective clothes during physical activity in hot conditions, reduces sweating and alleviates heat stress manifested by increased core and skin temperatures and heart rate values. These effects directly improve heat tolerance, hydration state, decrease in the risk of heat illness, and extends the duration of soldiers' exposure to extreme conditions.
    • الموضوع:
      Date Created: 20140405 Date Completed: 20140429 Latest Revision: 20220409
    • الموضوع:
      20231215
    • الرقم المعرف:
      10.2298/vsp120731045j
    • الرقم المعرف:
      24697012