In this study the effects of age (18-55 years), differing levels of fitness (VO 2max ranging from 35.5 to 68.8ml.kg-1.min-1) and endurance training (10 weeks) on heart rate control were investigated. Fitness level was initially determined by a VO2max stress test, succeeded by cold hand and cold face pressor test of autonomic activity. Following these baseline measurements, the subjects (32 nonsmoking male volunteers) were endurance-trained three to four times a week for a 10-week period. The baseline tests were readministered following the 10-week dynamic exercise training period. These data suggest that a natural consequence of aging is a diminishment of autonomic heart rate control; however, endurance training appears to interrupt the aging influence. Individuals of low fitness level appear to have heart rate control dominated by the sympathetic system, while individuals with high fitness levels have a vagally dominated heart rate control system.
| Identifer | oai:union.ndltd.org:unt.edu/info:ark/67531/metadc504283 |
| Date | 05 1900 |
| Creators | Baun, William Boyd |
| Contributors | Patton, Robert W., Raven, Peter Bernard, 1940- |
| Publisher | North Texas State University |
| Source Sets | University of North Texas |
| Language | English |
| Detected Language | English |
| Type | Thesis or Dissertation |
| Format | vii, 75 leaves: ill., Text |
| Rights | Public, Baun, William Boyd, Copyright, Copyright is held by the author, unless otherwise noted. All rights reserved. |
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