Purpose: The purpose of this study was to compare the effects of high intensity, time-to-exhaustion (TTE) cycling in hot and cold environments on pH, LA, bicarbonate , K+, and core temperature (Tc). Methods: Subjects completed four TTE trials: 1) Hot (35oC) 80% VO2max (H80), 2) Cold (10oC) 80% (C80), 3) Hot 100% (H100), and 4) Cold 100% (C100). Blood samples were taken at baseline, 5-min post, and 3-min post-exercise and analyzed for pH, HCO3-, and K+. Results: TTE was different between all trials except H100 and C100. pH was different at REC for all trials except H100 and C100 while LA was different between trials at REC. Bicarbonate was lowest at EXH in H80 and C80; however, HCO3- was lower for H80 and H100 at REC. Potassium was higher at EXH in the hot environments. Tc was higher at EXH for H80 and C80 compared to H100 and C100. Conclusions: Tc likely played a greater role in fatigue during H80 and C80 trials, while pH and HCO3- may have been more important factors during H100 and C100 trials.
| Identifer | oai:union.ndltd.org:TCU/oai:etd.tcu.edu:etd-06222007-150406 |
| Date | 22 June 2007 |
| Creators | Rogers, Melissa |
| Contributors | Joel B Mitchell |
| Publisher | Texas Christian University |
| Source Sets | Texas Christian University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf, application/msword |
| Source | http://etd.tcu.edu/etdfiles/available/etd-06222007-150406/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to TCU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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