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J Nutr Biochem. 2012 Dec;23(12):1740-8. doi: 10.1016/j.jnutbio.2011.05.017. Epub 2012 Jun 18.

The functional effect of soybean extract and isolated isoflavone on myocardial infarction and ventricular dysfunction: the soybean extract on myocardial infarction.

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Experimental Laboratory of the Center for Biological and Health Sciences, Pontifical Catholic University of Parana (PUCPR), Brazil.



Myocardial infarction is a public health problem. Functional food is an alternative treatment for cardiovascular diseases.


The objective was to analyze the functional and anatomopathological post-myocardial-infarction effects of soybean extract (SE) and isoflavone (IF).


Myocardial infarction was induced in adult Wistar rats. After 5 days, an echocardiogram was performed to determine heart rate (HR), ejection fraction (EF), systolic volume (LVESV) and diastolic volume (LVEDV). Animals with ventricular dysfunction (EF<45%) were selected for study. The animals were divided into three groups: control (n=14), SE (n=15) and IF (n=12). The IF group received 120 mg/kg/day isolated IF, and the SE group received 12.52 g/day. After 30 days, a new echocardiogram was performed. A histological exam was carried out to determine the collagen. Activity of biochemical markers [arginase, lactate dehydrogenase (LDH) and malate dehydrogenase] was measured.


The animals of the control, IF and SE groups showed a reduction in EF after the infarction (P=.432, P=.017 and P=.320, respectively). An increase of LVESV and LVEDV was observed in all groups (P=.009, P=.001 and P=.140; and P=.003, P=.008 and P=.205, respectively). A reduction of HR was found in the SE group (P=.020). There was a greater activity of LDH in the SE group. A smaller quantity of mature collagen was found in the region proximal to the myocardial infarction in the SE group.


A protective effect in the SE group was observed 30 days after the myocardial infarction.

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