PURPOSE: To examine the effect of aerobic exercise intensity on components of the differentiated perceived exertion model in young women performing weight bearing and non-weight bearing aerobic exercise. METHODS: Subjects were 18-25 yr old women who were recreationally active (N = 19; VO2max = 33.40 ml/kg/min) and trained (N = 22; VO2max = 43.3 ml/kg/min). Subjects underwent two graded exercise tests (GXT) separated by 48 hours. The first GXT used a treadmill and employed a modified Bruce protocol to assess ratings of perceived exertion (RPE) and VO2max. The second GXT used a cycle ergometer with a load incremented protocol to assess RPE and VO2peak. RPE-Overall, -Legs, and Chest, as well as oxygen uptake (VO2) and heart rate were recorded each minute. Individual regression analyses were used to identify RPE-Overall,-Legs, and -Chest at 40, 60, 80% VO2max/peak. Separate two factor (site (3) x intensity (3)) ANOVAs with repeated measures on site and intensity were computed for each training status. Furthermore, RPE responses were also examined with a one factor (site (3)) within subject ANOVA with repeated measure on site at the ventilatory breakpoint. RESULTS: For both the recreationally active and trained groups no significant differences were observed for RPE-Overall, -Legs, and Chest during treadmill exercise. However, for cycling exercise results indicated that RPE-Legs was significantly greater at all exercise intensities than RPE-Overall and RPE-Chest for trained subjects while for recreationally active subjects RPE-Legs was only significantly higher at the highest exercise intensity. Responses at the ventilatory breakpoint during cycle exercise indicated that RPE-Legs was significantly greater than RPE-Chest and RPE-Overall for trained subjects but not for recreationally active subjects. Signal dominance was not observed at an intensity equivalent to the ventilatory breakpoint during treadmill exercise in either of the groups. CONCLUSION: In recreationally active and trained females signal dominance was demonstrated only during cycling exercise, but not during treadmill exercise. Signal integration could not be demonstrated during cycling and treadmill exercise at various intensities.
| Identifer | oai:union.ndltd.org:PITT/oai:PITTETD:etd-12112008-113628 |
| Date | 09 January 2009 |
| Creators | Bolgar, Melinda R. |
| Contributors | Dr. Carol Baker, Dr. Fredric Goss, Dr. Robert Robertson, Dr. Elizabeth Nagle |
| Publisher | University of Pittsburgh |
| Source Sets | University of Pittsburgh |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.pitt.edu/ETD/available/etd-12112008-113628/ |
| 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 Pittsburgh 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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