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Int J Sports Med 2016; 37(02): 112-118
DOI: 10.1055/s-0035-1555776
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Anaerobic Threshold by Mathematical Model in Healthy and Post-Myocardial Infarction Men

L. D. Novais
1   Department of Physical Therapy, Cardiovascular Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos – UFSCar, Sao Carlos, Sao Paulo, Brazil
2   Department of Physical Therapy, Federal University of Triangulo Mineiro, Uberaba, Minas Gerais, Brazil
,
E. Silva
1   Department of Physical Therapy, Cardiovascular Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos – UFSCar, Sao Carlos, Sao Paulo, Brazil
,
R. P. Simões
1   Department of Physical Therapy, Cardiovascular Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos – UFSCar, Sao Carlos, Sao Paulo, Brazil
,
D. I. Sakabe
1   Department of Physical Therapy, Cardiovascular Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos – UFSCar, Sao Carlos, Sao Paulo, Brazil
3   Department of Physical Therapy, Integrated College Einstein of Limeira, Limeira, Sao Paulo, Brazil
,
L. E. B. Martins
4   Laboratory of Exercise Physiology, Faculty of Physical Education, Estadual University of Campinas, Campinas, Sao Paulo, Brazil
,
L. Oliveira
1   Department of Physical Therapy, Cardiovascular Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos – UFSCar, Sao Carlos, Sao Paulo, Brazil
,
C. A. R. Diniz
5   Department of Statistics, Federal University of Sao Carlos, Sao Carlos, Sao Paulo, Brazil
,
L. Gallo Jr
6   Department of Clinical Medicine, Laboratory of Exercise Physiology, Division of Cardiology, Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Brazil
,
A. M. Catai
1   Department of Physical Therapy, Cardiovascular Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos – UFSCar, Sao Carlos, Sao Paulo, Brazil
› Author Affiliations
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Publication History



accepted after revision 27 May 2015

Publication Date:
28 October 2015 (online)

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Abstract

The aim of this study was to determine the anaerobic threshold (AT) in a population of healthy and post-myocardial infarction men by applying Hinkley’s mathematical method and comparing its performance to the ventilatory visual method. This mathematical model, in lieu of observer-dependent visual determination, can produce more reliable results due to the uniformity of the procedure. 17 middle-aged men (55±3 years) were studied in 2 groups: 9 healthy men (54±2 years); and 8 men with previous myocardial infarction (57±3 years). All subjects underwent an incremental ramp exercise test until physical exhaustion. Breath-by-breath ventilatory variables, heart rate (HR), and vastus lateralis surface electromyography (sEMG) signal were collected throughout the test. Carbon dioxide output (V˙CO2), HR, and sEMG were studied, and the AT determination methods were compared using correlation coefficients and Bland-Altman plots. Parametric statistical tests were applied with significance level set at 5%. No significant differences were found in the HR, sEMG, and ventilatory variables at AT between the different methods, such as the intensity of effort relative to AT. Moreover, important concordance and significant correlations were observed between the methods. We concluded that the mathematical model was suitable for detecting the AT in both healthy and myocardial infarction subjects.

Key words

exercise - oxygen uptake - surface electromyography - coronary artery disease
 

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