Graduate Thesis Or Dissertation
 

Work load and S-T segment changes during monitored bicycle ergometer exertion following varied carbohydrate feedings and vitamin B-6 supplementation

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  • The purpose of this study was to monitor coronary responses occurring in the S-T segment of an electrocardiogram before, during and after exercise following a "standard" carbohydrate-loading schedule with varied vitamin B-6 supplementation. The study was conducted using four college-aged males who had been training a minimum of two years prior to the onset of the study with sport cycling as their primary mode of physical conditioning. The study design followed a plan of three one-week courses of fixed dietary intake accompanied by two monitored exercise sessions each week. The intensity of the exercise was determined by target heart rates of sixty, eighty, and ninety percent of age-adjusted values. The duration of the exercise was thirty minutes at 60% MHR, fifteen minutes at 80% MHR, and five minutes at 90% MHR. ECG tracings were taken each minute of the exercise. The first week consisted of a normal balanced diet as suggested by the U.S. RDA standards; the second week consisted of a carbohydrate-loading schedule with normal vitamin B-6 intake (2 mg)--three days of a depletion phase followed by a three day loading phase; and the third week consisted of a carbohydrate-loading schedule with a vitamin B-6 supplement (8 mg). Using student's t test of dependent means, a summary of the results indicate: 1. heart rates remained significantly constant throughout the six exercise testing sessions. 2. the external work output of the body (work loads achieved) significantly increased during the carbohydrate-loading phases and significantly decreased during the carbohydratedepletion phases for the same constant internal work (heart rate). 3. vitamin B-6 did not significantly alter the work loads achieved during exercise in excess of sixty percent maximum heart rate intensities. 4. the S-T segment was significantly abbreviated during the carbohydrate-depletion phases at all target heart rate intensity intervals and significantly abbreviated during the carbohydrate-loading phases at the ninety percent maximum heart rate intensity interval. From these results, it was concluded that, while in fact, the external work output of the body can be increased through a carbohydrate-loading dietary schedule, the cost of the increased work capacity appears to be an abbreviated S-T segment. Since one of the conditions identified in the literature that contributes to an abbreviated S-T segment is coronary insufficiency, continued healthy performance is contraindicated when the intensity of exertion nears maximal values.
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