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EFFECT OF FASTED OR CARBOHYDRATE INGESTION ON MOOD STATE POST RUN MEANSURED BY PANAS-GEN SURVEY AND CONTINUOUS GLUCOSE MONITORING

Abstract

McKenzie L. Hargrove, Suzanne L. McDonough. Mississippi College, Clinton, MS.

BACKGROUND: As technology advances, simpler means of regulating and tracking measures of health have become more readily available. One such means is continuous glucose monitoring. Continuous glucose monitoring (CGM) devices are becoming more popular as a simple method of tracking blood sugar in people with diabetes. However, the utility of these devices may extend further than just diabetes regulation. CGM devices are simple to use and provide very little discomfort to the individual utilizing them, which makes them an ideal way for athletes to measure their blood glucose levels during training. The purpose of this study is to report the relationship between blood glucose levels and feelings of well-being after a continuous 90-minute run. METHODS: A sample of 5 recreationally fit men (age 45.2±6.5) wore the Libre™ Continuous Glucose Monitor (CGM) and ran 9-12 miles at a tempo pace supervised by a researcher on 4 separate days. On two of the days, subjects were instructed to arrive in a fasted state and on the other two days they were asked to eat a high CHO snack an hour before the run. On each day, subjects completed the PANAS-GEN survey before and after the run in order to assess feelings of well-being. RESULTS: There were no significant differences between pre- and post-blood glucose levels (89.3 mg/dL vs 96.7mg/dL, p =.40) in the fasted state. There were significant differences between the pre-and post-blood glucose levels (88.4 mg/dL vs 106.3 mg/dL, p =.00) in the high CHO fed state. As a whole, there was an inverse relationship (p = .01, r = .531) between post-run blood glucose levels and negative affect scores: however, this relationship did not appear when groups were separated into fasting vs. non-fasting. CONCLUSIONS: The post-blood glucose levels in both the fasted and non-fasted state remained within a clinically normal range, suggesting that the subjects were fat-adapted and metabolically efficient. While positive affect did not increase post-run, negative affect did decrease. Because this decreased negative affect correlated with increased blood-glucose levels post-run, this suggests that long aerobic runs might decrease negative feelings in metabolically efficient runners. These findings warrant further investigation with a larger sample size.

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