To examine the effects of walking duration on excess post exercise oxygen consumption (EPOC), recovery substrate availability and fuel utilization, nine overfat (38.5 $\pm$ 2.4%) females completed treadmill walking sessions of 30, 45, 60, 75 and 90 minutes. Oxygen consumption (VO$\sb2$) and respiratory exchange ratio (RER) were continuously monitored by open circuit spirometry for 30 minutes before (rest) and 60 minutes following (recovery) each walking session. Resting and one-hour recovery venous blood was assayed for free fatty acid (FFA) and glycerol concentrations. Repeated measures ANOVAs were utilized for data analysis with Newman-Keuls' post-hoc employed to locate significant differences (p $\leq$ 0.05) between means. / Walking significantly elevated recovery VO$\sb2$ by 9.7%. Despite a non-significant walking duration effect, VO$\sb2$ at one hour of recovery following 30, 45, 60, 75 and 90 minutes of walking was 0.5%, 10.0%, 9.5%, 10.0% and 19.0% higher than pre-exercise rest. EPOC following 30 minutes of walking was significantly shorter in duration (minutes) and smaller in magnitude (net O$\sb2$ consumed) than for all other walking durations. Magnitude of EPOC was also significantly smaller for the 45 than the 90 minute walk. / Recovery concentrations of FFA were significantly elevated above rest following walking durations of 60, 75 and 90 minutes, while differences in rest and recovery glycerol concentrations were not significant. Respiratory exchange ratios at one-hour of recovery following both the 75 and 90 minute walks were significantly lower than respective pre-exercise resting RERs and significantly lower than recovery RERs following 30 and 45 minutes of walking. One-hour post-exercise, utilization of fat was elevated above rest by 5.4% (30 minute walk), 6.4% (45 minute walk), 9.4% (60 minute walk), 15.9% (75 minute walk) and 16.8% (90 minute walk). / A minimum walking duration of 45 minutes is required for sedentary overweight females before significant increases in recovery oxygen consumption and fat utilization occur. Recovery rates of oxygen consumption and fat utilization are further optimized as walking duration is extended to 90 minutes. Recommendations and statements concerning recovery and weight loss benefits of walking should consider these duration effects. / Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page: 1273. / Major Professor: Robert J. Moffatt. / Thesis (Ph.D.)--The Florida State University, 1991.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_76371 |
| Contributors | Chitwood, Linda F., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 246 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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