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Title: Determination of anaerobic threshold through heart rate and near infrared spectroscopy in elderly healthy men
Authors: Reis, Michel Silva
Berton, Danilo Cortozi [UNIFESP]
Arena, Ross
Catai, Aparecida Maria
Neder, Jose Alberto [UNIFESP]
Borghi-Silva, Audrey
Universidade Federal do Rio de Janeiro School of Medicine Physical Therapy Department
Universidade Federal de São Paulo (UNIFESP)
University of Illinois College of Applied Health Sciences Physical Therapy Department
Universidade Federal de Sao Carlos Physical Therapy Department Nucleus of Research in Physical Exercise
Keywords: physical therapy
anaerobic threshold
cardiopulmonary test
heteroscedastic model
Issue Date: 1-Oct-2013
Publisher: Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia
Citation: Brazilian Journal of Physical Therapy. Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia , v. 17, n. 5, p. 506-515, 2013.
Abstract: 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.
ISSN: 1413-3555
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