| Journal: | Brazilian journal of medical and biological research |
| Database: | PERIÓDICA |
| System number: | 000349884 |
| ISSN: | 0100-879X |
| Authors: | Higa, M.N1 Silva, E2 Neves, V.F.C2 Catai, A.M2 Gallo-Junior, L1 Silva de Sa, M.F1 |
| Institutions: | 1Universidade de Sao Paulo, Faculdade de Medicina de Ribeirao Preto, Ribeirao Preto, Sao Paulo. Brasil 2Universidade Federal de Sao Carlos, Nucleo de Pesquisa em Exercicio Fisico, Sao Carlos, Sao Paulo. Brasil |
| Year: | 2007 |
| Season: | Abr |
| Volumen: | 40 |
| Number: | 4 |
| Pages: | 501-508 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | 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 > 0.05). The VO2 (mL kg-1 min-1) data showed significant correlation (P < 0.05) between the gold standard method and the mathematical model when applied to HR (rs = 0.75) and VCO2 (rs = 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 |
| Disciplines: | Medicina |
| Keyword: | Fisiología humana, Ejercicio físico, Umbral anaeróbico, Mujeres, Modelos matemáticos, Algoritmo de Hinkley |
| Keyword: | Medicine, Human physiology, Physical exercise, Anaerobic threshold, Women, Mathematical models, Hinkley algorithm |
| Full text: | Texto completo (Ver HTML) |
