Sarcopenia is a common condition that is associated mainly with hormonal factors, nutritional status, physical activity, leading to a lower quality of life. Thus, this study aimed to evaluate the effects of diets with vegetable or animal proteins (AP) associated with resistance training on the structure of the soleus muscle in aged Wistar rats. The histochemical technique was used for the typing of muscle fibers, the cross-sectional area of myocytes, and volume densities of myocytes and interstitium. Picrosirius stain was used to quantify the collagen density. Diet intake, mainly animal protein, associated with resistance training leaded to muscle remodeling, and increased deposit of collagen fibers. We observed hypertrophy in animal groups that consumed animal protein diet, even the sedentary group, although more evident in those trained.

肌肉减少症是一种常见状况，主要与荷尔蒙因素，营养状况，体育活动有关，从而导致生活质量降低。因此，本研究旨在评估饮食中与抗性训练相关的植物或动物蛋白（AP）饮食对老年Wistar大鼠比目鱼肌结构的影响。组织化学技术用于肌肉纤维的分型，心肌细胞的横截面积，以及心肌细胞和间质的体积密度。Picrosirius染色用于定量胶原蛋白密度。饮食摄入，主要是动物蛋白，与抵抗训练有关，导致肌肉重塑，并增加胶原纤维的沉积。我们在食用动物蛋白饮食的动物组（甚至久坐的组）中观察到肥大，尽管在受过训练的动物中更为明显。