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Vol. 21. Issue 4.
Pages 244-250 (01 July 2017)
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Vol. 21. Issue 4.
Pages 244-250 (01 July 2017)
Original research
DOI: 10.1016/j.bjpt.2017.05.001
Resistance training improves aortic structure in Wistar rats
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Romeu R. Souza
Corresponding author
souzarrd@uol.com.br

Corresponding author at: Rua Afonso de Freitas 451 apt. 122 – Paraiso, São Paulo, SP, Brazil.
, Elias de França, Diana Madureira, Carla C.R. Pontes, Jeferson O. Santana, Erico C. Caperuto
Setor de Pós-Graduação em Educação Física, Universidade São Judas Tadeu (USJT), São Paulo, SP, Brazil
Highlights

  • There is aortic adaptation to resistance training in an experimental animal model.

  • Resistance training promoted left ventricle concentric hypertrophy and improved aortic wall structure by increasing the density of elastic fibers and collagen fibers and increasing the thickness of collagen fibrils.

  • Resistance training rats displayed aortic remodeling.

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Table 1. Effects of resistance training on cardiac growth and stereological parameters of the aorta of rats after 3-month of training.
Abstract
Background

Little information is available on the effects of resistance training on the aortic wall.

Objective

This study aimed to quantify the effects of a resistance-training program on blood pressure and aortic wall structural components.

Methods

Rats (aged three months) were randomized into sedentary group (control group, CG; n=10) or trained group (TG; n=10). The TG rats performed resistance training by climbing a 1.1-m vertical ladder (80° incline) five times a week for 12 weeks, and the CG remained sedentary. The rats were sacrificed and 5mm of the ascending aorta was submitted to histological sections, which were stained with hematoxylin–eosin, Picrosirius red, and Verhoeff's elastin, and used for morphometric studies. Left ventricle (LV) hypertrophy was determined by measuring LV wall thickness and LV internal diameter.

Results

The rats had similar repetition maximum before the resistance training. At the end of the resistance training period, the repetition maximum of the TG was 3.04-fold greater than the body weight. In the twelfth month, the left ventricular weight was 15.3% larger in the TG than in the CG, and the left ventricular internal diameter was reduced by 10% in the TG. Rats exposed to resistance training had a significant increase in aortic wall thickness, in both elastic lamina and collagen fibers, and in the thickness of collagen fibrils.

Conclusion

Resistance training induces the development of concentric cardiac hypertrophy and improves the aortic wall components by producing a morphological expression pattern distinct from aortic pathological adaptation.

Keywords:
Anaerobic training
Great vessels
Morphometry
Movement

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