The effect of repeated episodes of dietary restriction and refeeding on systolic blood pressure and food intake in exercise-trained normotensive rats

Gary D. Miller, Alison G. Dimond, Judith S. Stern

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

To explore the effects of weight cycling and exercise on blood pressure and macronutrient intake in Sprague-Dawley rats. Research Methods and Procedures: Female Sprague-Dawley rats (n = 62; 5 months old) were assigned to an ad libitum (Con) or weight-cycled (Cyc) group. They were either sedentary (Con-Sed and Cyc-Sed) or exercise-trained (Con-Ex and Cyc-Ex) on a motorized treadmill (20 m/minute; 60 minutes/day; 6 days/week). The Cyc groups underwent 2 cycles of 3 weeks of 60% food restriction followed by 5 weeks of ad libitum refeeding using a macronutrient self-selection diet. Body mass and food intake were analyzed weekly. Systolic blood pressure (SBP) was measured at baseline and during the first and fifth weeks of each refeeding. Results: For both cycling periods, SBP was elevated in Cyc vs. Con groups at Week 1 of refeeding, but was similar among groups by Week 5 of refeeding. Both Con groups had greater total energy intake than the Cyc groups for both cycling periods (Cycle 1: 2882.2 ± 75.1, Con-Sed; 2916.1 ± 67.1, Con-Ex; 2692.2 ± 58.7, Cyc-Sed; and 2780.5 ± 52.4 kcal, Cyc-Ex) (Cycle 2: 2815.8 ± 75.1, Con-Sed; 2938.8 ± 49.4, Con-Ex; 2577.1 ± 60.5, Cyc-Sed; and 2643.5 ± 65.9 kcal, Cyc-Ex). Relative fat intake (percentage of total kcal/week) was significantly less for Con-Ex and Cyc-Ex than Con-Sed and Cyc-Sed throughout both refeeding periods. Discussion: Weight cycling failed to produce significant sustained effects on SBP, body mass, or food intake. Exercise training, irrespective of diet, lowered dietary fat intake.

Original languageEnglish (US)
Pages (from-to)324-336
Number of pages13
JournalObesity Research
Volume8
Issue number4
StatePublished - Jul 2000

Fingerprint

dietary restriction
refeeding
systolic blood pressure
food intake
exercise
Eating
Blood Pressure
weight cycling
rats
fat intake
Weights and Measures
Sprague Dawley Rats
exercise equipment
research methods
Diet
food choices
blood pressure
energy intake
Dietary Fats
Energy Intake

Keywords

  • Food intake
  • Macronutrient self-selection
  • Rats
  • Weight cycling

ASJC Scopus subject areas

  • Food Science
  • Endocrinology
  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism
  • Public Health, Environmental and Occupational Health

Cite this

The effect of repeated episodes of dietary restriction and refeeding on systolic blood pressure and food intake in exercise-trained normotensive rats. / Miller, Gary D.; Dimond, Alison G.; Stern, Judith S.

In: Obesity Research, Vol. 8, No. 4, 07.2000, p. 324-336.

Research output: Contribution to journalArticle

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abstract = "To explore the effects of weight cycling and exercise on blood pressure and macronutrient intake in Sprague-Dawley rats. Research Methods and Procedures: Female Sprague-Dawley rats (n = 62; 5 months old) were assigned to an ad libitum (Con) or weight-cycled (Cyc) group. They were either sedentary (Con-Sed and Cyc-Sed) or exercise-trained (Con-Ex and Cyc-Ex) on a motorized treadmill (20 m/minute; 60 minutes/day; 6 days/week). The Cyc groups underwent 2 cycles of 3 weeks of 60{\%} food restriction followed by 5 weeks of ad libitum refeeding using a macronutrient self-selection diet. Body mass and food intake were analyzed weekly. Systolic blood pressure (SBP) was measured at baseline and during the first and fifth weeks of each refeeding. Results: For both cycling periods, SBP was elevated in Cyc vs. Con groups at Week 1 of refeeding, but was similar among groups by Week 5 of refeeding. Both Con groups had greater total energy intake than the Cyc groups for both cycling periods (Cycle 1: 2882.2 ± 75.1, Con-Sed; 2916.1 ± 67.1, Con-Ex; 2692.2 ± 58.7, Cyc-Sed; and 2780.5 ± 52.4 kcal, Cyc-Ex) (Cycle 2: 2815.8 ± 75.1, Con-Sed; 2938.8 ± 49.4, Con-Ex; 2577.1 ± 60.5, Cyc-Sed; and 2643.5 ± 65.9 kcal, Cyc-Ex). Relative fat intake (percentage of total kcal/week) was significantly less for Con-Ex and Cyc-Ex than Con-Sed and Cyc-Sed throughout both refeeding periods. Discussion: Weight cycling failed to produce significant sustained effects on SBP, body mass, or food intake. Exercise training, irrespective of diet, lowered dietary fat intake.",
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