Cardiovascular function is under the influence of autonomic nervous system, both of which can be assessed non-invasively. The purpose of this dissertation was to examine these non-invasive markers of cardiovascular and autonomic function and their relationships with exercise training, glucose ingestion and hydration status. A series of three studies were conducted to gain insight to various influences on cardiovascular and autonomic function.
The first study examined the influence of exercise training of brachial artery flow-mediated dilation (BAFMD) using meta-analytic techniques. Sixty-six studies included in the analysis demonstrated exercise training improves BAFMD compared to controls. Results indicated exercise training significantly alters BAFMD, a well-known factor associated with prevention of cardiovascular diseases. Exercise training interventions including greater intensity and duration may optimize increases in BAFMD.
The second study observed glucose ingestion alters autonomic nervous system function, shifting the sympathetic/parasympathetic balance to higher sympathetic activity. Higher exercise intensity decreased fasting heart rate variability 24-hrs after cessation of exercise whereas lower exercise intensity did not alter heart rate variability. Acute exercise increased heart rate variability after an oral glucose tolerance test, but was not affected by exercise intensity.
The last study determined the effect of chronic dehydration on cardiovascular and sweat responses during exercise in a heated environment. Dehydration altered blood and urine markers of hydration status, but did not change cardiovascular and sweat response to exercise in the heat. . In addition, BAFMD was related to the change in weighted skin temperature and body temperature during exercise in the heat, and increased LF/HF at rest was associated with increased peak heat storage. Together these data suggest resting cardiovascular health may influence the ability to thermoregulate during exercise in the heat.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04042016-085638 |
| Date | 20 April 2016 |
| Creators | Early, Kate Suzanne |
| Contributors | Johannsen, Neil, Nelson, Arnold, Landin, Dennis, Stroope, Samuel |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04042016-085638/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein 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 LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, 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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