Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women
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...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Divulgação Científica
2007-04-01
|
| Series: | Brazilian Journal of Medical and Biological Research |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000400008 |
| _version_ | 1811274296358600704 |
|---|---|
| author | M.N. Higa E. Silva V.F.C. Neves A.M. Catai L. Gallo Jr. M.F. Silva de Sá |
| author_facet | M.N. Higa E. Silva V.F.C. Neves A.M. Catai L. Gallo Jr. M.F. Silva de Sá |
| author_sort | M.N. Higa |
| collection | DOAJ |
| description | 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 (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. |
| first_indexed | 2024-04-12T23:15:09Z |
| format | Article |
| id | doaj.art-9d81b4d829e44a8da167f66840583d7b |
| institution | Directory Open Access Journal |
| issn | 0100-879X 1414-431X |
| language | English |
| last_indexed | 2024-04-12T23:15:09Z |
| publishDate | 2007-04-01 |
| publisher | Associação Brasileira de Divulgação Científica |
| record_format | Article |
| series | Brazilian Journal of Medical and Biological Research |
| spelling | doaj.art-9d81b4d829e44a8da167f66840583d7b2022-12-22T03:12:41ZengAssociação Brasileira de Divulgação CientíficaBrazilian Journal of Medical and Biological Research0100-879X1414-431X2007-04-01404501508Comparison of anaerobic threshold determined by visual and mathematical methods in healthy womenM.N. HigaE. SilvaV.F.C. NevesA.M. CataiL. Gallo Jr.M.F. Silva de SáSeveral 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 (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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000400008Anaerobic thresholdIncremental testGraphic visual methodMathematical modelHinkley's algorithm |
| spellingShingle | M.N. Higa E. Silva V.F.C. Neves A.M. Catai L. Gallo Jr. M.F. Silva de Sá Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women Brazilian Journal of Medical and Biological Research Anaerobic threshold Incremental test Graphic visual method Mathematical model Hinkley's algorithm |
| title | Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women |
| title_full | Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women |
| title_fullStr | Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women |
| title_full_unstemmed | Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women |
| title_short | Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women |
| title_sort | comparison of anaerobic threshold determined by visual and mathematical methods in healthy women |
| topic | Anaerobic threshold Incremental test Graphic visual method Mathematical model Hinkley's algorithm |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000400008 |
| work_keys_str_mv | AT mnhiga comparisonofanaerobicthresholddeterminedbyvisualandmathematicalmethodsinhealthywomen AT esilva comparisonofanaerobicthresholddeterminedbyvisualandmathematicalmethodsinhealthywomen AT vfcneves comparisonofanaerobicthresholddeterminedbyvisualandmathematicalmethodsinhealthywomen AT amcatai comparisonofanaerobicthresholddeterminedbyvisualandmathematicalmethodsinhealthywomen AT lgallojr comparisonofanaerobicthresholddeterminedbyvisualandmathematicalmethodsinhealthywomen AT mfsilvadesa comparisonofanaerobicthresholddeterminedbyvisualandmathematicalmethodsinhealthywomen |