potência atada na máxima fase estável de lactato e índices do desempenho aeróbio de nado

Abstract

Introduction: The validity of tethered-swimming to assess swimmer endurance capacity was analyzed in the present research. Objective: The aim of this study was to analyse the relationship between the mechanical power at maximal lactate steady state (PTethMLSS) with its respective parameter in free swimming (velocity at MLSS, vMLSS) and with others indices of aerobic evaluation and endurance performance in free crawl swimming. Methods: Ten male swimmers (16.6 ± 1.4 years old) were submitted to the following measurements: (a) CPTeth(estimated from non-linear asymptote for load and time-limited plotting, CriticalLoad), (b) PTethMLSSand vMLSS(3 or 4 trials ranging from 95 to 105% of CriticalLoad and 85 to 95% of 400-m crawl performance, respectively), (c) an incremental protocol (79-100% of v400m, with step increments of 3%) to assess velocity at inflexion point (vIP) and, (d) swimming performance of 400 (v400m), 800 (v800m) and 1500 (v1500m) meters. Pearson and variance coefficients were used to analyze the relationships between aerobic parameters and performance indexes. Bland-Altman test was used to analyze the agreement between blood lactate values. Significance was set at p ≤ 0.05 for all analysis. Results: Values of PTethMLSS(89.2 ± 15.1 W) presented similar potential to explain the variance of performance in v400m(1.29 ± 0.11 m.s-1, R2= 0.700), v800m(1.23 ± 0.12 m.s-1, R2= 0.770) and v1500m(1.21 ± 0.12 m.s-1, R2= 0.698), as well as vMLSS(1.17 ± 0.11 m.s-1) and vIP (1.19 ± 0.11 m.s-1). Blood lactate levels at PTethMLSS, vMLSSand vIP were not different and were distributed within the concordance limits. Conclusion: We concluded that MFEL in tethered-swimming is a valid and promising protocol for aerobic evaluation of swimmers.