Journals of Gerontology Series A: Biological Sciences and Medical Sciences Large Type Edition
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The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 61:781-794 (2006)
© 2006 The Gerontological Society of America

Calorie Restriction in Mice: Effects on Body Composition, Daily Activity, Metabolic Rate, Mitochondrial Reactive Oxygen Species Production, and Membrane Fatty Acid Composition

Sally C. Faulks, Nigel Turner, Paul L. Else and A. J. Hulbert

1 Metabolic Research Centre, and 2 School of Biological Sciences, 3 Department of Biomedical Sciences, University of Wollongong, New South Wales, Australia.

Address correspondence to A. J. Hulbert, PhD, DSc, School of Biological Sciences, University of Wollongong, Wollongong, NSW 2522, Australia. E-mail: hulbert{at}uow.edu.au

Different levels of calorie restriction (CR) (125, 85, 50, or 40 kcal/wk for 1, 3, and 6 months) were examined in mice by using the paradigm of Weindruch and colleagues. Lean and total body mass increased on 125 and 85 kcal/wk, but there was negligible growth on low-energy intake. There was no CR-induced reduction in either daily activity or mass-specific metabolic rate. There was no CR-effect on in vitro reactive oxygen species production by liver or muscle mitochondria at 3 months, but after 6 months the effect was significantly reduced in liver mitochondria from 40 kcal/wk mice compared to 125 kcal/wk mice. Changes in the fatty acid composition of phospholipids from liver, kidneys, heart, brain, and skeletal muscle were observed following 1 month of CR.




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