Title page for ETD etd-09082005-165133


Type of Document Master's Thesis
Author Bunol, Calynn Davis
Author's Email Address cdavis5@lsu.edu
URN etd-09082005-165133
Title Autonomic Nervous System Modulation of the Heart Following a High Carbohydrate Liquid Meal
Degree Master of Science (M.S.)
Department Kinesiology
Advisory Committee
Advisor Name Title
Robert Wood Committee Chair
Arnold Nelson Committee Member
Melinda Solmon Committee Member
Keywords
  • females
  • obese
  • lean
Date of Defense 2005-07-18
Availability unrestricted
Abstract
The involvement of the sympathetic nervous system in the pathology of obesity has long been a debate among researchers. Various methods of capturing the resting sympathetic activity as well as the response of the sympathetic activity elicited by the introduction of a meal or a bout of exercise in both lean and obese individuals have been investigated. This study examined the autonomic modulation of the heart following a high carbohydrate liquid meal in various body types. Twenty-five females with body mass indexes [weight (kg)/height2(m)] ranging from 19.3-39.5 were grouped according to relative basal energy expenditure adjusted for lean body mass (High relative basal energy expenditure - HIGH rBEE and Low relative basal energy expenditure -LOW rBEE). Each female consumed ENSURE with Fiber at a calorie level equal to forty percent of her basal energy expenditure. Heart rate variability was measured for 15min at rest, immediately following the meal, and hourly for 5hrs postprandial. The LOW rBEE group at baseline as well as postprandial tended to demonstrate an elevated sympathetic activity when compared to the HIGH rBEE group (LOW rBEE - resting LF/HF ratio 2.36 2.3, peak increase two hours pp LF/HF ratio 3.09 2.9; HIGH rBEE - resting LF/HF ratio 1.93 1.7, peak increase fifteen minutes pp LF/HF ratio 1.98 0.9). Meal induced thermogenesis, measured as changes in sympathetic activity, was higher in the LOW rBEE group. In conclusion, this study has shown that in the pre and postabsorptive state, individuals with a LOW rBEE tend to be more hyperadrenergic when compared to HIGH rBEE individuals, which may signify an adverse cardiovascular risk. The evidence supports the assertion that when the SNS response to a meal in various body types is being investigated, a duration of greater than 5hrs post prandial is necessary.
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