Data/hora: 04/06/2024 18:06:40

Provedor de dados: | 56
País: | Brazil
Título: | Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women
Autores: | Higa,M.N.; Silva,E.; Neves,V.F.C.; Catai,A.M.; Gallo Jr.,L.; Silva de Sá,M.F.
Data: | 2007-04-01
Ano: | 2007
Palavras-chave: | Anaerobic threshold; Incremental test; Graphic visual method; Mathematical model; Hinkley's algorithm.
Resumo: | Several methods are used to estimate anaerobic threshold (AT) during exercise. The aim of the present study was to compare AT obtained by a graphic visual method for the estimate of ventilatory and metabolic variables (gold standard), to a bi-segmental linear regression mathematical model of Hinkley's algorithm applied to heart rate (HR) and carbon dioxide output (VCO2) data. Thirteen young (24 ± 2.63 years old) and 16 postmenopausal (57 ± 4.79 years old) healthy and sedentary women were submitted to a continuous ergospirometric incremental test on an electromagnetic braking cycloergometer with 10 to 20 W/min increases until physical exhaustion. The ventilatory variables were recorded breath-to-breath and HR was obtained beat-to-beat over real time. Data were analyzed by the nonparametric Friedman test and Spearman correlation test with the level of significance set at 5%. Power output (W), HR (bpm), oxygen uptake (VO2; mL kg-1 min-1), VO2 (mL/min), VCO2 (mL/min), and minute ventilation (VE; L/min) data observed at the AT level were similar for both methods and groups studied (P &gt; 0.05). The VO2 (mL kg-1 min-1) data showed significant correlation (P &lt; 0.05) between the gold standard method and the mathematical model when applied to HR (r s = 0.75) and VCO2 (r s = 0.78) data for the subjects as a whole (N = 29). The proposed mathematical method for the detection of changes in response patterns of VCO2 and HR was adequate and promising for AT detection in young and middle-aged women, representing a semi-automatic, non-invasive and objective AT measurement.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000400008
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X2007000400008
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.40 n.4 2007
Fonte: | info:eu-repo/semantics/openAccess