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ISSN 1995-9427 (Print)

2014, Number 2

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Invest Medicoquir 2014; 6 (2)

Evaluation of the effect of the mental effort regarding the variability of the heart frequency

Pérez LVM, Almirall HPJ, Pérez BA

Language: Spanish
References: 27
Page: 179-197
PDF size: 558.25 Kb.


ABSTRACT

Introduction: The necessity to find methods for the cardiovascular illnesses prevention motivates this investigation. The paper of the factors psycho social risk in the emergence and evolution of the chronic illnesses, the interest for the relationship between the mental effort and the cardiovascular dysfunctions is considered. Methods: A traverse and analytic experimental quasi of comparison of groups study was carried out; 32 sick and 32 healthy persons, in the Surgical Medical Center of Investigations (2009-2012). Both groups, rhyming couplets in four variables; age, sex, school level and perception of the labor demands; they were subjected to the resolution of an incremental protocol of mental demands and it was evaluated in a continuous way the variability of the heart frequency. The statistical analysis was carried out by means of a group of contained statisticians in the SSPS package version 18, using methods of the descriptive statistic and of inference. They are used not parametric technical when being proven by means of the technical Kolmogorov Smirnov that the variables don't follow a normal distribution. Results: The variability of the heart frequency diminished in the face of the mental effort. Before more demands mental adult it was the decrease of the variability of the heart frequency mainly in the group of the sick persons. The values of the line base on the sick it was also smaller. Evidently the sick persons, independent of the diagnosis and other clinical particularities, they show an unfavorable difference in comparison with the healthy ones in the behavior of the HRV in the line it bases and before tasks of mental effort. The percents of decrease of the HRV in the face of the mental effort in comparison with the values of the line base and it was the following one: in the task 1 (smaller degree of mental effort) the decrease went until of 31 % in healthy and 46% in sick persons, in the task 2; 38 % in healthy and 54 % in sick persons and in the task 3, it diminished 46% for healthy and 62 % in sick persons. The percent of difference of decrease of the HRV between groups in the same task was between a 15 and 16% more for the sick persons. Conclusions: The variability of the heart frequency diminishes in the face of the mental effort with significant difference in favor of the persons without cardiovascular illnesses, which allowed proposing indicators to value the autonomous answer (HVR) in the face of the mental effort in sick and healthy persons.


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