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Serum S-100ß response to exercise-heat strain before and after acclimation.

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Title: Serum S-100ß response to exercise-heat strain before and after acclimation.
Authors: Cheuvront SN (AUTHOR), Chinevere TD (AUTHOR), Ely BR (AUTHOR), Kenefick RW (AUTHOR), Goodman DA (AUTHOR), McClung JP (AUTHOR), Sawka MN (AUTHOR)
Source: Medicine & Science in Sports & Exercise. Aug2008, Vol. 40 Issue 8, p1477-1482. 6p.
Abstract: Exercise alone or in combination with environmental heat stress can elevate blood S-100beta protein concentrations. However, the explanatory power of exercise with marked environmental heat stress on the appearance of S-100beta is questionable. It is possible that the process of heat acclimation might afford additional insight. PURPOSE:: Determine the S-100beta response to moderate-intensity exercise with heat strain before and after heat acclimation. METHODS:: Nine healthy male volunteers completed 10 consecutive days of heat acclimation consisting of up to 100 min of treadmill walking (1.56 m.s, 4% grade) in the heat (45 degrees C, 20% relative humidity). Changes in HR, rectal temperature (Tre), and sweat rate (SR) were examined to determine successful acclimation. Area under the curve (AUC) for Tre greater than 38.5 degrees C was calculated to assess cumulative hyperthermia. Blood samples were taken before and after exercise on days 1 and 10 and were analyzed for serum osmolality and S-100beta concentration. RESULTS:: All subjects displayed physiological adaptations to heat acclimation including a significant (P < 0.05) reduction in final HR (161 to 145 bpm) and Tre (39.0 to 38.4 degrees C), as well as a modest ( 10%) increase in SR (1.10 to 1.20 L.h; P = 0.09). No differences were observed in pre- to postexercise serum S-100beta concentrations on day 1 or 10, and no differences were observed in S-100beta values between days 1 and 10. No significant correlations were found between S-100beta values and any variable of interest. CONCLUSIONS:: S-100beta concentrations do not necessarily increase in response to exercise-heat strain, and no effect of heat acclimation on S-100beta could be observed despite other quantifiable physiological adaptations. [ABSTRACT FROM AUTHOR]
Copyright of Medicine & Science in Sports & Exercise is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Serum S-100&#223; response to exercise-heat strain before and after acclimation.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Medicine+%26+Science+in+Sports+%26+Exercise%22&quot;&gt;Medicine &amp; Science in Sports &amp; Exercise&lt;/searchLink&gt;. Aug2008, Vol. 40 Issue 8, p1477-1482. 6p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Exercise alone or in combination with environmental heat stress can elevate blood S-100beta protein concentrations. However, the explanatory power of exercise with marked environmental heat stress on the appearance of S-100beta is questionable. It is possible that the process of heat acclimation might afford additional insight. PURPOSE:: Determine the S-100beta response to moderate-intensity exercise with heat strain before and after heat acclimation. METHODS:: Nine healthy male volunteers completed 10 consecutive days of heat acclimation consisting of up to 100 min of treadmill walking (1.56 m.s, 4% grade) in the heat (45 degrees C, 20% relative humidity). Changes in HR, rectal temperature (Tre), and sweat rate (SR) were examined to determine successful acclimation. Area under the curve (AUC) for Tre greater than 38.5 degrees C was calculated to assess cumulative hyperthermia. Blood samples were taken before and after exercise on days 1 and 10 and were analyzed for serum osmolality and S-100beta concentration. RESULTS:: All subjects displayed physiological adaptations to heat acclimation including a significant (P &lt; 0.05) reduction in final HR (161 to 145 bpm) and Tre (39.0 to 38.4 degrees C), as well as a modest ( 10%) increase in SR (1.10 to 1.20 L.h; P = 0.09). No differences were observed in pre- to postexercise serum S-100beta concentrations on day 1 or 10, and no differences were observed in S-100beta values between days 1 and 10. No significant correlations were found between S-100beta values and any variable of interest. CONCLUSIONS:: S-100beta concentrations do not necessarily increase in response to exercise-heat strain, and no effect of heat acclimation on S-100beta could be observed despite other quantifiable physiological adaptations. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Medicine &amp; Science in Sports &amp; Exercise is the property of Lippincott Williams &amp; Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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              Text: Aug2008
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