Avaliação da concordância dos limiares metabólicos por meio de três métodos diferentes de identificação
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Data
2019-04-26
Autores
Neves, Letícia Nascimento Santos
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Universidade Federal do Espírito Santo
Resumo
Metabolic thresholds are physiological intensity markers, important in the evaluation and
prescription of physical exercises, and can be determined through several variables, among
them lactacidemia, ventilatory parameters and, more recently, heart rate variability (HRV).
Lactacidemia and ventilatory parameters are further consolidated in the literature as
independent markers of metabolic thresholds. However, when it comes to HRV there is still
inconsistency in the results of the studies, mainly with the use of different interpretative
variables. This complicates its practical application, not allowing to conclude that the methods
(lactate threshold 1 and 2, ventilatory threshold 1 and 2, but mainly the heart rate variability
threshold 1 and 2) could be used interchangeably. Thus, this investigation aims to evaluate the
agreement between the three identification methods of metabolic thresholds 1 and 2. The
sample consisted in 34 participants, young adults (± 22 years), university students, male. The
procedures were divided into two visits to the laboratory. Initially, anamnesis data and
anthropometric measures were collected. The cardiopulmonary exercise test (CPx) with ramp
protocol until exhaustion was performed to identify the ventilatory threshold, and to estimate
the speed at which the step test started. After 48h, the second test was performed, the stepwise
progressive test (TPE) composed 3 min stages to identify the metabolic thresholds. Manova
was used to compare means between methods, followed by Sidak post-hoc. Pearson's
correlation was applied to verify association between the methods. The coefficient of variation
(CV) and typical error (TE) were used to verify variability and precision, the intraclass
correlation coefficient (ICC) and Bland Altman to evaluate reliability and agreement. The
results revealed that at threshold 1, although acceptable concordances were found, the
variability values were high and the reliability low. On the other hand, at threshold 2, good
agreement, acceptable variability and high reliability were found. Therefore, based on the
results, three methods can be used interchangeably/independently at threshold 2, however at
threshold 1 showed controversial, but can be used as an auxiliary tool in the identification of
the threshold 1.
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Palavras-chave
Anaerobic Threshold , Lactate Threshold , Heart Rate Variability , Ventilatory Threshold , Performance , Limiar Anaeróbio , Limiar de Lactato , Variabilidade da Frequência Cardíaca , Limiar Ventilatório , Desempenho