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Oxidative Medicine and Cellular Longevity
Volume 2016 (2016), Article ID 9251064, 10 pages
http://dx.doi.org/10.1155/2016/9251064
Research Article

Morphological and Biochemical Effects on the Skeletal Muscle of Ovariectomized Old Female Rats Submitted to the Intake of Diets with Vegetable or Animal Protein and Resistance Training

1Laboratory of Morphological and Immunohistochemical Studies, Universidade São Judas Tadeu, Brazil
2Postgraduate Program (Stricto Sensu), Ph.D. Course in Physical Education, Universidade São Judas Tadeu, Brazil
3Biological Sciences Department, Federal University of São Paulo, Diadema, SP, Brazil
4Laboratory of Clinical Analysis, ABC Medical School, Santo André, SP, Brazil

Received 12 October 2015; Revised 5 December 2015; Accepted 7 December 2015

Academic Editor: Valentina Pallottini

Copyright © 2016 Glaucia Figueiredo Braggion et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Introduction. Sarcopenia is a process characterized by reduction in protein mass and muscle strength with increasing age, especially in the postmenopausal period, resulting in functional limitations and with great impact on the physical autonomy of the elderly. Objective. To evaluate the effects of diets with vegetable proteins (VP) or animal proteins (AP) associated with resistance training (RT) on the structural and biochemical parameters of the medial gastrocnemius muscle in Wistar rats with sarcopenia. Methods. An experimental model with ovariectomized rats was used to induce sarcopenia and resistance training. The histochemical technique was used for the typing of muscle fibers, the cross-sectional area of myocytes, and volume densities of myocytes and interstitium; the technique of Picrosirius stain was used to highlight the collagen fibers. Results. The VP diet was not able to minimize the effects of sarcopenia in the medial gastrocnemius of sedentary animals and when associated with RT, it promoted maintenance of the CSA, attenuating the atrophy of type IIB fibers in the medial gastrocnemius. The AP diet in sedentary animals protected the type I fibers. When combined with RT, the AP promoted muscle remodeling, with reduction in volume density of type I and IIA fibers, and increase of IIB fibers, together with an increase in collagen volume density. Conclusion. The data suggest a tendency to better results of hypertrophy in animal groups that consumed the AP diet, even the sedentary animals, although more evident in those trained.