EFFECT OF EXOGENOUS ICE SLURRY ON PHYSIOLOGICAL STRAIN INDEX DURING EXERCISE IN THE HEAT.
F. von Sydow, T.J. Hampton, J.S. Cuddy, B.C. Ruby, FACSM, and C.L. Dumke, FACSM.
The University of Montana, Missoula, MT
Ice slurry solution (IS) ingested during exercise in the heat may alleviate physiological strain index (PSI) by lessening the rise of core temperature (Tc), and heart rate (HR.) PURPOSE: To investigate IS influence on PSI during submaximal running in the heat. METHODS: Six recreationally trained subjects (60+3 ml*kg-1*min-1) participated in two running trials on an outdoor track (30+1.5˚C, 25%RH). The two trials were run at the same absolute intensity (187.6 m*min-1), and given either an ambient carbohydrate drink (25˚C) or IS (-1˚C) in random order. Subsequently, three recreationally aerobic trained subjects (59+3 ml*kg-1* min-1) participated in two running trials inside a climate chamber (34˚C, 40%RH). Subjects acclimatized in the chamber for 15 minutes then ran for 1hr with increasing speed every 20 minutes followed by an incremental time trial (TT) test to exhaustion. RESULTS: Using 2x3 ANOVA, outside runners had a significantly lower PSI (5.4+1.6 vs. 7.1+1.3; P=0.01), however HR (P=0.63), Tc (P=0.56), Tsk (P=0.55), and sweat rate (P=0.06) did not reach significance (P>0.05). Chamber runners had a significantly increased TT performance when given IS compared to ambient drink (8.2+2.1 min vs 6.4+1.8 min; P=0.01). Although chamber runners did not achieve significantly lower PSI (P=0.35), HR (P=0.51), Tc (P=0.51), Tsk (P=0.43), sweat rate (P=0.21) or RPE (P=0.58) when given IS. Nevertheless, CONCLUSIONS: These findings indicate that IS may have a significant impact on PSI. The IS also significantly increased TT performance. These data show the potential for increased running performance when IS is given during moderate exercise in the heat.
| Identifer | oai:union.ndltd.org:MONTANA/oai:etd.lib.umt.edu:etd-06102014-084258 |
| Date | 20 June 2014 |
| Creators | von Sydow, Felipe |
| Contributors | Stephen Lodmell, Charles Palmer, Brent Ruby, Charles Dumke |
| Publisher | The University of Montana |
| Source Sets | University of Montana Missoula |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.umt.edu/theses/available/etd-06102014-084258/ |
| 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 University of Montana 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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