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Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners
INTRODUCTION: The purpose of this study was to evaluate the application of the Dmax method on heart rate variability (HRV) to estimate the lactate thresholds (LT), during a maximal incremental running test (MIRT). METHODS: Nineteen male runners performed two MIRTs, with the initial speed at 8 km·h(−...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Hindawi
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6770371/ https://www.ncbi.nlm.nih.gov/pubmed/31641671 http://dx.doi.org/10.1155/2019/2075371 |
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author | Nascimento, Eduardo Marcel Fernandes Antunes, Diego do Nascimento Salvador, Paulo Cesar Borszcz, Fernando Klitzke de Lucas, Ricardo Dantas |
author_facet | Nascimento, Eduardo Marcel Fernandes Antunes, Diego do Nascimento Salvador, Paulo Cesar Borszcz, Fernando Klitzke de Lucas, Ricardo Dantas |
author_sort | Nascimento, Eduardo Marcel Fernandes |
collection | PubMed |
description | INTRODUCTION: The purpose of this study was to evaluate the application of the Dmax method on heart rate variability (HRV) to estimate the lactate thresholds (LT), during a maximal incremental running test (MIRT). METHODS: Nineteen male runners performed two MIRTs, with the initial speed at 8 km·h(−1) and increments of 1 km·h(−1) every 3 minutes, until exhaustion. Measures of HRV and blood lactate concentrations were obtained, and lactate (LT(1) and LT(2)) and HRV (HRVT(DMAX1) and HRVT(DMAX2)) thresholds were identified. ANOVA with Scheffe's post hoc test, effect sizes (d), the bias ± 95% limits of agreement (LoA), standard error of the estimate (SEE), Pearson's (r), and intraclass correlation coefficient (ICC) were calculated to assess validity. RESULTS: No significant differences were observed between HRVT(DMAX1) and LT(1) when expressed for speed (12.1 ± 1.4 km·h(−1) and 11.2 ± 2.1 km·h(−1); p=0.55; d = 0.45; r = 0.46; bias ± LoA = 0.8 ± 3.7 km·h(−1); SEE = 1.2 km·h(−1) (95% CI, 0.9–1.9)). Significant differences were observed between HRVT(DMAX2) and LT(2) when expressed for speed (12.0 ± 1.2 km·h(−1) and 14.1 ± 2.5 km·h(−1); p=0.00; d = 1.21; r = 0.48; bias ± LoA = −1.0 ± 1.8 km·h(−1); SEE = 1.1 km·h(−1) (95% CI, 0.8–1.6)), respectively. Reproducibility values were found for the LT(1) (ICC = 0.90; bias ± LoA = −0.7 ± 2.0 km·h(−1)), LT(2) (ICC = 0.97; bias ± LoA = −0.1 ± 1.1 km·h(−1)), HRVT(DMAX1) (ICC = 0.48; bias ± LoA = −0.2 ± 3.4 km·h(−1)), and HRVT(DMAX2) (ICC = 0.30; bias ± LoA = 0.3 ± 3.5 km·h(−1)). CONCLUSIONS: The Dmax method applied over a HRV dataset allowed the identification of LT(1) that is close to aerobic threshold, during a MIRT. |
format | Online Article Text |
id | pubmed-6770371 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Hindawi |
record_format | MEDLINE/PubMed |
spelling | pubmed-67703712019-10-22 Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners Nascimento, Eduardo Marcel Fernandes Antunes, Diego do Nascimento Salvador, Paulo Cesar Borszcz, Fernando Klitzke de Lucas, Ricardo Dantas J Sports Med (Hindawi Publ Corp) Research Article INTRODUCTION: The purpose of this study was to evaluate the application of the Dmax method on heart rate variability (HRV) to estimate the lactate thresholds (LT), during a maximal incremental running test (MIRT). METHODS: Nineteen male runners performed two MIRTs, with the initial speed at 8 km·h(−1) and increments of 1 km·h(−1) every 3 minutes, until exhaustion. Measures of HRV and blood lactate concentrations were obtained, and lactate (LT(1) and LT(2)) and HRV (HRVT(DMAX1) and HRVT(DMAX2)) thresholds were identified. ANOVA with Scheffe's post hoc test, effect sizes (d), the bias ± 95% limits of agreement (LoA), standard error of the estimate (SEE), Pearson's (r), and intraclass correlation coefficient (ICC) were calculated to assess validity. RESULTS: No significant differences were observed between HRVT(DMAX1) and LT(1) when expressed for speed (12.1 ± 1.4 km·h(−1) and 11.2 ± 2.1 km·h(−1); p=0.55; d = 0.45; r = 0.46; bias ± LoA = 0.8 ± 3.7 km·h(−1); SEE = 1.2 km·h(−1) (95% CI, 0.9–1.9)). Significant differences were observed between HRVT(DMAX2) and LT(2) when expressed for speed (12.0 ± 1.2 km·h(−1) and 14.1 ± 2.5 km·h(−1); p=0.00; d = 1.21; r = 0.48; bias ± LoA = −1.0 ± 1.8 km·h(−1); SEE = 1.1 km·h(−1) (95% CI, 0.8–1.6)), respectively. Reproducibility values were found for the LT(1) (ICC = 0.90; bias ± LoA = −0.7 ± 2.0 km·h(−1)), LT(2) (ICC = 0.97; bias ± LoA = −0.1 ± 1.1 km·h(−1)), HRVT(DMAX1) (ICC = 0.48; bias ± LoA = −0.2 ± 3.4 km·h(−1)), and HRVT(DMAX2) (ICC = 0.30; bias ± LoA = 0.3 ± 3.5 km·h(−1)). CONCLUSIONS: The Dmax method applied over a HRV dataset allowed the identification of LT(1) that is close to aerobic threshold, during a MIRT. Hindawi 2019-09-19 /pmc/articles/PMC6770371/ /pubmed/31641671 http://dx.doi.org/10.1155/2019/2075371 Text en Copyright © 2019 Eduardo Marcel Fernandes Nascimento et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Nascimento, Eduardo Marcel Fernandes Antunes, Diego do Nascimento Salvador, Paulo Cesar Borszcz, Fernando Klitzke de Lucas, Ricardo Dantas Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners |
title | Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners |
title_full | Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners |
title_fullStr | Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners |
title_full_unstemmed | Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners |
title_short | Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners |
title_sort | applicability of dmax method on heart rate variability to estimate the lactate thresholds in male runners |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6770371/ https://www.ncbi.nlm.nih.gov/pubmed/31641671 http://dx.doi.org/10.1155/2019/2075371 |
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