Abstract--The objective of the present study was to follow the structural modifications of the aortic wall in middle-aged rats submitted to a resistance training protocol for a period of four months. Three groups of 8 animals per group were considered: middle-aged group (MA), old control group (OC) and old trained group (OT). Training consisted in to climb a 1.1-m vertical (80° incline) ladder with weights tied to their tail. Aortic wall structural modifications were studied through light and electron microscopy and morphometry. The mean arterial blood pressure at rest was similar in the three experimental groups (p = .07). At the beginning of the experiment, the OC and OT groups had similar repetition maximums, ranging from 1.6-fold to 1.9-fold the body weight. At the end of the experiment, the repetition maximum of the OT group was 5-fold greater than the body weight (p = .03). The LV weight was 15% larger in the OT group than in the MA group and 12% larger than in the OC group (p = .02). The LV wall thickness of the OT group was significantly larger than that of both, the MA group and the OC group (p = .03). The LV internal diameter in the OT group was significantly smaller than that observed in the MA and OC groups (p = .02). Resistance training diminished the alterations associated with aging improving aortic wall structure by reducing the thickness, normalising the elastic material, the collagen and the smooth muscle cells. Resistance training seems to be a potential treatment for reducing the deleterious effects of aging on the aortic wall.Keywords: aortic structure, anaerobic training, remodeling, stereology Resumo--"O treinamento resistido atenua os efeitos do envelhecimento na aorta de ratos Wistar." Este estudo teve por objetivo avaliar as modificações da parede da aorta de ratos Wistar de meia-idade, submetidos a treinamento resistido por 4 meses. Foram utilizados 3 grupos de animais com oito animais por grupo: meia idade (MI), idoso controle (IC) e idoso treinado (IT). Os ratos subiam uma escada vertical inclinada (80°) com pesos atrelados à cauda. A parede da aorta foi avaliada através de microscopia de luz e eletrônica e morfometria. A pressão arterial média no repouso foi similar nos três grupos experimentais (p = 0,07). No início, os grupos IC e IT tiveram treinamento de repetições máximas semelhantes, variando de 1,6 a 1,9 vezes o valor do peso corporal. No final o treinamento de repetição maxima do grupo IT foi 5 vezes maior que o peso corporal (p = 0,03). O peso do ventrículo esquerdo do grupo IT foi 15% maior do que o do grupo MI e 12% maior do que o do grupo IC (p = 0,02). A espessura da parede do ventrículo no grupo IT foi significantemente maior do que nos grupos MI e IC (p = 0,03). O diâmetro interno da cavidade do ventrículo foi significantemente menor no grupo IT do que nos demais grupos (p = 0,02). O treinamento diminuiu as alterações associadas com o envelhecimento melhorando a estrutura da parede da aorta através da redução da sua espessura, normalização quantitativa do material elá...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.