| Does Baseline HDL-C Influence the Dose and Response Relationship Between Acute Exercise and Post-exercise HDL-C Improvement? | |
Abstract/OtherAbstract
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Does Baseline HDL-C Influence the Dose and Response Relationship Between Acute Exercise and Post-exercise HDL-C Improvement? Purpose: The purpose of this study was to determine if high density lipoprotein cholesterol (HDL-C) status (low vs. normal) affects the magnitude of post-exercise HDL-C changes over a 24 hour period and whether different caloric expenditures (300, 500 and 700 kcals) augment this relationship. Methods: Two groups of healthy untrained male volunteers participated in this study. Subjects were assigned to one of two groups based upon their resting HDL-C level. The LOW HDL-C group consisted of 13 subjects with clinically low HDL-C (< 40mg/dl) and the NORMAL HDL-C group consisted of 14 subjects with normal HDL-C (≥ 45mg/dl). Age, diet, VO2max and anthropometric data were collected prior to initiation of the experimental protocol and were similar for both groups. The characteristics of the LOW group were 21.9 ± 2.0 yrs of age, 1.8 ± 0.1 m tall, weighed 80.9 ± 7.9 kg, and had a BMI of 25.2 ± 2.2 kg/m2, a VO2max of 45.8 ± 5.1 ml/kg/min and a resting HDL-C of 35.7 ± 2.7 mg/dl. Characteristics of the NORMAL group were 23.4 ± 7.1yrs of age, 1.8 ± 0.1 m tall, weighed 78.6 ± 7.6 kg, and had a BMI of 24.3 ± 2.5 kg/m2, a VO2max of 47.5 ± 4.8 ml/kg/min and a resting HDL-C of 53.9 ± 5.8 mg/dl. Subjects randomly completed three nonconsecutive exercise trials (300, 500, and 700 kcals) on a treadmill at 65% of VO2max. Blood samples were collected pre-exercise (PRE), immediately post-exercise (IP), and 24 hours post-exercise (+24). Each sample was analyzed for HDL-C and its subfractions (HDL2-C and HDL3-C) and was corrected for plasma volume shifts. Results: There was no significant main effect of group or condition (kcal expenditure) and no interactions among variables. HDL3-C increased significantly IP regardless of group or caloric expenditure, but was not different from PRE at +24. HDL-C increased (5.6%) significantly IP regardless of group when the 500 and 700 kcal trials were combined, again the effect was transient. Individually, no caloric expenditure produced HDL-C or subfraction changes that were significantly different from one another. Conclusions: Baseline HDL-C status had no significant effect on the magnitude of post-exercise HDLC alterations. Furthermore, post-exercise improvements of HDL-C in untrained men occur via increases in HDL3-C and primarily at caloric expenditures above 300 kcals. |
Authors
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Lawrence, Tait |
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Contributors
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Robert J. Moffatt, Lynn B. Panton, Laurie M. Grubbs |
Publication Detail
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Publisher : FSU Libraries Digital Library Center Type : text Format : application/pdf |
Date Detail
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2009-01-27 |
Subject
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Nutrition, Food, and Exercise Science, Department of |
Coverage
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Relation
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Source
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http://etd.lib.fsu.edu/theses/available/etd-11102008-112345/ |
Copyright Information
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unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Florida State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
Other Details
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Languages : en |
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