Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress
Background/Aim. Exertional heat stress is common problem in military services. The aim was to examine changes in serum concentrations of some enzymes in soldiers during exertional heat stress test (EHST) as well as the effects of 10-days passive or active acclimatization in climatic chamber. Methods...
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Ministry of Defence of the Republic of Serbia, University of Defence, Belgrade
2009-01-01
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| Series: | Vojnosanitetski Pregled |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/0042-8450/2009/0042-84500905359R.pdf |
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| author | Radaković Sonja Marić Jelena Šurbatović Maja Vasiljević Nađa Milivojević Mladen |
| author_facet | Radaković Sonja Marić Jelena Šurbatović Maja Vasiljević Nađa Milivojević Mladen |
| author_sort | Radaković Sonja |
| collection | DOAJ |
| description | Background/Aim. Exertional heat stress is common problem in military services. The aim was to examine changes in serum concentrations of some enzymes in soldiers during exertional heat stress test (EHST) as well as the effects of 10-days passive or active acclimatization in climatic chamber. Methods. Forty male soldiers with high aerobic capacity, performed EHST either in cool (20 ºC, 16 ºC Wet bulb globe temperature - WBGT), or hot (40 ºC, 25 ºC WBGT) environment, unacclimatized, or after 10 days of passive or active acclimation. Physiological strain was measured by tympanic temperatures (Tty) and heart rates (HR). Concentrations of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), lactate dehydrogenase (LDH), and creatine-kinase (CK) were measured in blood samples collected before and immediately after EHST. Results. Exertional heat stress test in hot conditions induced physiological heat stress (increase in Tty and HR), with significant increase in concentrations of all enzymes in unacclimatized group: ALT (42.5 ± 4.2 before vs 48.1 ± 3.75 U/L after EHST, p < 0.01), AST (24.9 ± 5.1 vs 33.4 ± 4.48 U/L, p < 0.01), LDH (160.6 ± 20.2 vs 195.7 ± 22.6 U/L, p < 0.001) and CK (215.5 ± 91.2 vs 279.1 ± 117.5 U/L, p < 0.05). In acclimatized soldiers there were no significant changes in concentrations of ALT and AST, while concentration of CK was significantly higher. Concentrations of LDH were significantly higher in all investigated groups, regardless of temperature conditions. Conclusion. In trained soldiers, 10-days passive or active acclimatization in climatic chamber can prevent increase in serum concentrations of ALT and AST, induced by exertional heat stress. Increase of serum concentrations of CK and LDH was induced by physical strain itself, with no additional effect of heat stress. |
| format | Article |
| id | doaj-art-eee79e33713e48d6a3f53d16c6c1bffa |
| institution | DOAJ |
| issn | 0042-8450 |
| language | English |
| publishDate | 2009-01-01 |
| publisher | Ministry of Defence of the Republic of Serbia, University of Defence, Belgrade |
| record_format | Article |
| series | Vojnosanitetski Pregled |
| spelling | doaj-art-eee79e33713e48d6a3f53d16c6c1bffa2025-08-20T03:06:30ZengMinistry of Defence of the Republic of Serbia, University of Defence, BelgradeVojnosanitetski Pregled0042-84502009-01-0166535936410.2298/VSP0905359RInfluence of acclimatization on serum enzyme changes in soldiers during exertional heat stressRadaković SonjaMarić JelenaŠurbatović MajaVasiljević NađaMilivojević MladenBackground/Aim. Exertional heat stress is common problem in military services. The aim was to examine changes in serum concentrations of some enzymes in soldiers during exertional heat stress test (EHST) as well as the effects of 10-days passive or active acclimatization in climatic chamber. Methods. Forty male soldiers with high aerobic capacity, performed EHST either in cool (20 ºC, 16 ºC Wet bulb globe temperature - WBGT), or hot (40 ºC, 25 ºC WBGT) environment, unacclimatized, or after 10 days of passive or active acclimation. Physiological strain was measured by tympanic temperatures (Tty) and heart rates (HR). Concentrations of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), lactate dehydrogenase (LDH), and creatine-kinase (CK) were measured in blood samples collected before and immediately after EHST. Results. Exertional heat stress test in hot conditions induced physiological heat stress (increase in Tty and HR), with significant increase in concentrations of all enzymes in unacclimatized group: ALT (42.5 ± 4.2 before vs 48.1 ± 3.75 U/L after EHST, p < 0.01), AST (24.9 ± 5.1 vs 33.4 ± 4.48 U/L, p < 0.01), LDH (160.6 ± 20.2 vs 195.7 ± 22.6 U/L, p < 0.001) and CK (215.5 ± 91.2 vs 279.1 ± 117.5 U/L, p < 0.05). In acclimatized soldiers there were no significant changes in concentrations of ALT and AST, while concentration of CK was significantly higher. Concentrations of LDH were significantly higher in all investigated groups, regardless of temperature conditions. Conclusion. In trained soldiers, 10-days passive or active acclimatization in climatic chamber can prevent increase in serum concentrations of ALT and AST, induced by exertional heat stress. Increase of serum concentrations of CK and LDH was induced by physical strain itself, with no additional effect of heat stress.http://www.doiserbia.nb.rs/img/doi/0042-8450/2009/0042-84500905359R.pdfacclimatizationmilitary personnelenzymesserumheat stress disordersexertion |
| spellingShingle | Radaković Sonja Marić Jelena Šurbatović Maja Vasiljević Nađa Milivojević Mladen Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress Vojnosanitetski Pregled acclimatization military personnel enzymes serum heat stress disorders exertion |
| title | Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress |
| title_full | Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress |
| title_fullStr | Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress |
| title_full_unstemmed | Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress |
| title_short | Influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress |
| title_sort | influence of acclimatization on serum enzyme changes in soldiers during exertional heat stress |
| topic | acclimatization military personnel enzymes serum heat stress disorders exertion |
| url | http://www.doiserbia.nb.rs/img/doi/0042-8450/2009/0042-84500905359R.pdf |
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