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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tsekouras, Yiannis E. Kavouras, Stavros A. Bellou, Elena Magkos, Faidon Maraki, Maria Sidossis, Labros S. Galani, Maria Siopi, Aikaterina Panagiotakos, Demosthenes B. |
| Description | Country affiliation: Greece Author Affiliation: Bellou E ( Laboratory of Nutrition and Clinical Dietetics, Department of Nutrition and Dietetics, Harokopio University, Athens, Greece.) |
| Abstract | PURPOSE: The mechanisms by which exercise reduces fasting plasma triglyceride (TG) concentrations in women and the effect of negative energy balance independent of muscular contraction are not known.The aim of this study was to evaluate the effects of equivalent energy deficits induced by exercise or calorie restriction on basal VLDL-TG metabolism in women. METHODS: Eleven healthy women (age = 23.5 ± 2.7 yr, body mass index = 21.6 ± 1.4 kg·m-2; mean ± SD) underwent a stable isotopically labeled tracer infusion study to determine basal VLDL-TG kinetics after performing, in random order, three experimental trials on the previous day: (i) a single exercise bout (brisk walking at 60% of peak oxygen consumption for 123 ± 18 min, with a net energy expenditure of 2.06 ± 0.39 MJ, â ¼500 kcal), (ii) dietary energy restriction of 2.10 ± 0.41 MJ, and (iii) a control day of isocaloric feeding and rest (zero energy balance). RESULTS: Fasting plasma VLDL-TG concentration was approximately 30% lower after the exercise trial compared with the control trial (P < 0.001), whereas no significant change was detected after the calorie restriction trial (P = 0.297 vs control). Relative to the control condition, exercise increased the plasma clearance rate of VLDL-TG by 22% (P = 0.001) and reduced hepatic VLDL-TG secretion rate by approximately 17% (P = 0.042), whereas hypocaloric diet had no effect on VLDL-TG kinetics (P > 0.2). CONCLUSION: (i) Exercise-induced hypotriglyceridemia in women manifests through a different mechanism (increased clearance and decreased secretion of VLDL-TG) than that previously described in men (increased clearance of VLDL-TG only), and (ii) exercise affects TG homeostasis by eliciting changes in VLDL-TG kinetics that cannot be reproduced by an equivalent diet-induced energy deficit, indicating that these changes are independent of the exercise-induced negative energy balance but instead are specific to muscular contraction. |
| ISSN | 01959131 |
| e-ISSN | 15300315 |
| DOI | 10.1249/MSS.0b013e318278183e |
| Journal | Medicine & Science in Sports & Exercise |
| Issue Number | 3 |
| Volume Number | 45 |
| Language | English |
| Publisher | Lippincott Williams & Wilkins (on behalf of the American College of Sports Medicine) |
| Publisher Date | 2013-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Caloric Restriction Physiology Lipoproteins, Vldl Blood Triglycerides Blood Glucose Metabolism Energy Metabolism Fatty Acids Insulin Statistics, Nonparametric Randomized Controlled Trial Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Sports Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science |
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