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Brazilian Journal of Physical Therapy

Print version ISSN 1413-3555

Abstract

REIS, Michel S. et al. Determination of anaerobic threshold through heart rate and near infrared spectroscopy in elderly healthy men. Braz. J. Phys. Ther. [online]. 2013, vol.17, n.5, pp.506-515. ISSN 1413-3555.  http://dx.doi.org/10.1590/S1413-35552012005000115.

BACKGROUND:

Aging leads to low functional capacity and this can be reversed by safe and adequate exercise prescription.

OBJECTIVE:

The aim of this study was to identify the anaerobic threshold (AT) obtained from the V-slope method as well as visual inspection of oxyhemoglobin ( O2Hb) and deoxyhemoglobin (HHb) curves and compare findings with the heteroscedastic (HS) method applied to carbon dioxide production ( CO2), heart rate (HR), and HHb data in healthy elderly men. A secondary aim was to assess the degree of agreement between methods for AT determination.

METHOD:

Fourteen healthy men (61.4±6.3 years) underwent cardiopulmonary exercise testing (CPX) on a cycle ergometer until physical exhaustion. Biological signals collected during CPX included: ventilatory and metabolic variables; spectroscopy quasi-infrared rays - NIRS; and HR through a cardio-frequency meter.

RESULTS:

We observed temporal equivalence and similar values of power (W), absolute oxygen consumption (O2 - mL/min), relative O2 ( mL.Kg - 1.min -1), and HR at AT by the detection methods performed. In addition, by the Bland-Altman plot, HR confirmed good agreement between the methods with biases between -1.3 and 3.5 beats per minute.

CONCLUSIONS:

(i) all detection methods were sensitive in identifying AT, including the HS applied to HR and (ii) the methods showed a good correlation in the identification of AT. Thus, these results support HR as valid and readily available parameter in determining AT in healthy elderly men.

Keywords : physical therapy; anaerobic threshold; NIRS; cardiopulmonary test; heteroscedastic model.

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