Effects of Caloric Restriction and Exercise Training on Skeletal Muscle Histochemistry in Aging Fischer 344 Rats

Author:

Lowenthal David T.1,Kendrick Zebulon V.2,Starnes Joseph W.3,Carmeli Eli4

Affiliation:

1. (GRECC) Geriatric Research, Education and Clinical Center, Department of Veterans Affairs Medical Center, 1601 SW Archer Road, Gainesville, FL, USA

2. Research Laboratory, College of Health Professions, Temple University, Philadelphia, PA, USA

3. Department of Kinesiology and Health Education, Cardiac Metabolism Laboratory, University of Texas, Austin, TX, USA

4. Department of Physical Therapy and Skeletal Muscle Laboratory, Sackler Faculty of Medicine, Stanley Steyer School of Health Professions, Tel Aviv University, Ramat Aviv, Israel

Abstract

The purpose of this study was to determine the effects of calorie restriction and exercise on hindlimb histochemistry and fiber type in Fischer 344 rats as they advanced from adulthood through senescence. At 10 months of age, animals were divided into sedentary fedad libitum, exercise (18 m/min, 8% grade, 20 min/day, 5 days/week) fedad libitum, and calorie restricted by alternate days of feeding. Succinic dehydrogenase, myosin adenosine triphosphatase (mATPase at pH 9.4), nicotine adenonine dinucleotide reductase, and Periodic Acid Shiff histochemical stains were performed on plantaris and soleus muscles. The results indicated that aging resulted in a progressive decline in plantaris Type I muscle fiber in sedentary animals, while exercise resulted in maintenance of these fibers. The percent of plantaris Type II fibers increased between 10 and 24 months of age. Exercise also resulted in a small, but significant, increase in the percentage of plantaris Type IIa fibers at 24 months of age. The soleus fiber distribution for Type I fibers was unaffected by increasing age in all groups of animals. The implications of these results suggest the implementation of exercise as a lifestyle modification as early as possible.

Publisher

Hindawi Limited

Subject

General Environmental Science,General Biochemistry, Genetics and Molecular Biology,General Medicine

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