The purpose of this investigation was to assess the physiologic, biochemical and performance changes that occurred during a 35-day period as a result of three weeks ingestion of a low carbohydrate-ketogenic diet by trained females. Seven trained females (19-28 years) volunteered for participation in this study. The experimental period was divided into five seven-day phases. Sequentially, mean percent carbohydrate intake for the five dietary phases was: 45.9, 12.5, 12.9, 12.7 48.9. / Data were collected at seven-day intervals. Measures included 24-hour urine samples, exercise and rest expired air and blood samples, and exercise heart rates. Performance was assessed by an interval bicycle ergometer ride at 85% VO(,2) max. Body composition was assessed at days 1, 30 and 37. Leg power was assessed at days 6, 13, 20, 27 and 30. / Significant results at p < 0.05 associated with the low carbohydrate phases of the diet included: increased urinary ketones, urine volume, HDL-cholesterol, resting and exercise FFA concentrations, exercise heart rates and ratings of perceived exertion; decreased body weight and fat, exercise time and respiratory exchange ratios, resting and exercise blood lactate concentrations. There were no significant changes in total serum cholesterol concentration, oxygen consumption at rest or during exercise, the sum of three skinfolds, leg power, resting respiratory exchange ratio, resting serum glucose concentration, hematocrit at rest or during exercise, or percent decrease in plasma volume among the five dietary phases. Urinary calcium excretion was significantly related to dietary protein intake. Urinary 3-methylhistidine excretion was significantly related to dietary muscle protein intake prior to urine collection. / It was concluded that ingestion of a low carbohydrate-ketogenic diet does induce some metabolic alterations that affect performance. Trained individuals, when ingesting a diet deficient in carbohydrate, cannot perform endurance exercise at the same level as when they are ingesting a diet containing greater than 40% of the calories as carbohydrate. This inability to perform endurance exercise was associated with increased fat mobilization and utilization during exercise at 85% VO(,2) max. / Source: Dissertation Abstracts International, Volume: 44-11, Section: A, page: 3318. / Thesis (Ph.D.)--The Florida State University, 1983.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75203 |
| Contributors | COONEY, MARGARET MARY., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 176 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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