The contribution of protein as a substrate source during exercise has recently been suggested to be 5-20% instead of 1-2%. Isolated studies have observed female and male responses but never simultaneously in the study. It was the purpose of this study to observe protein utilization in women and men during the same experimental stress. Five trained women and men, who were matched by their aerobic capacity (42-50 ml/kg/min) underwent a discontinuous VO(,2)max test to determine 70% and 60% VO(,2)max values. The subjects returned to the lab for a resting, baseline session and two exercise series consisting of a one-hour (1 h) 70% VO(,2)max muscle glycogen depletion ride and a 1h 60% VO(,2)max data collection ride. Subjects alternated between a carbohydrate loaded diet (CHO-l) and a carbohydrate depleted diet (CHO-d). Urine samples were collected pre-post exercise. Serum samples were obtained pre-, mid-, and post-exercise. Sweat was collected in a gauze pad on the upper arm, chest, and abdomen during three 15-minute intervals. Urea nitrogen in the urine, serum, and sweat was used as an indicator of protein utilization and 3-methylhistidine as an indicator of skeletal muscle degradation. There were no significant gender differences with respect to urea nitrogen and 3-methylhistidine. The CHO-d diet significantly increased the concentration of urea nitrogen in the serum (p < .05) and the urea nitrogen excretion rate in the sweat and the urine (p < .05) in comparison with CHO-l and baseline. Three-methylhistidine excretion in the urine was not significantly altered by the diets. The established range of protein contribution in this study was between .80-1.36%. The results of this study indicate that women and men respond similarly with respect to protein contribution to energy production when introduced to the same relative exercise stress. / Source: Dissertation Abstracts International, Volume: 45-04, Section: B, page: 1123. / Thesis (Ph.D.)--The Florida State University, 1984.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75322 |
| Contributors | KONOPKA, BARBARA JEAN., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 106 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
Page generated in 0.002 seconds