Determination of anaerobic threshold through heart rate and near infrared spectroscopy in elderly healthy men

Brazilian Journal of Physical Therapy

Michel S. Reis¹  Danilo C. Berton¹  Ross Arena¹  Aparecida M. Catai¹  Jose A. Neder¹  Audrey Borghi-silva¹ 

关键词: physical therapy;    anaerobic threshold;    NIRS;    cardiopulmonary test;    heteroscedastic model;   

DOI  :  10.1590/S1413-35552012005000115

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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