PURPOSE: The primary purposes of this investigation were to examine the validity of the Physical Activity Index (PAI) as, (a) a measure of total activity load (intensity of exercise x volume of exercise) and (b) as an estimate of total kilocalorie (kcal) expenditure during submaximal treadmill walking. A secondary purpose was to compare estimated kcal expenditure determined by the PAI prediction model to the estimated kcal expenditure determined by the SenseWear Pro Armband. METHODS: Thirty-two recreationally active females (20.36 ± 1.27 years) participated in this study. Subjects participated in three counterbalanced submaximal walking bouts: low intensity (4.02 km⋅hr⁻¹, 0% grade), moderate intensity (5.63 km⋅hr⁻¹, 2.5% grade), and high intensity (7.24 km⋅hr⁻¹, 5% grade). Each bout was separated by five min of rest. During each of the three exercise bouts, oxygen consumption (VO₂), rating of perceived exertion (RPE), pedometer step count, and kcal expenditure were measured. The PAI was calculated as the product of RPE and pedometer step count for each of the three, 10 minute bouts of treadmill walking. RESULTS: Concurrent validation of the PAI was established using VO₂ and heart rate (HR) as the criterion variables. Multiple regression analyses revealed a strong, positive relation between PAI score and VO₂ (r = 0.92) and HR (r = 0.84). Data were then used to develop a statistical model to estimate kcal expenditure using the PAI score as the predictor variable. Walking kcal expenditure predicted by Model III was highly correlated with measured kcal expenditure (r = 0.85). Similarly, kcal expenditure estimated by the SenseWear Pro Armband™ evidenced a strong, positive correlation with measured kcal expenditure (r = 0.83) when calculated across the three walking intensities. CONCLUSION: The development of a PAI using RPE and pedometer step count to estimate kcal expenditure may have significant public health implications. The PAI was found to be more accurate then the Armband method of estimating kcal expenditure and is a simple, unobtrusive and inexpensive tool which may be used to assess kcal expenditure in public health, clinical, and/or rehabilitation settings.
| Identifer | oai:union.ndltd.org:PITT/oai:PITTETD:etd-07312007-125029 |
| Date | 27 September 2007 |
| Creators | Weary-Smith, Kimberly Anne |
| Contributors | Elizabeth F. Nagle, Fredric L. Goss, Robert J. Robertson, Kevin H. Kim, Deborah J. Aaron |
| 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-07312007-125029/ |
| 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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