Tether-power at maximal lactate steady-state and endurance indexes of swimming performance

Pessôa Filho, Dalton Müller; Greco, Camila Coelho; Denadai, Benedito Sérgio

doi:10.1590/1517-86922014200500714

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Revista Brasileira de Medicina do Esporte

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Fisiologia Do ExercÍcio • Rev Bras Med Esporte 20 (5) • Sep-Oct 2014 • https://doi.org/10.1590/1517-86922014200500714 copy

Tether-power at maximal lactate steady-state and endurance indexes of swimming performance

Authorship SCIMAGO INSTITUTIONS RANKINGS

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 (P_TethMLSS) with its respective parameter in free swimming (velocity at MLSS, v_MLSS) 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) CP_Teth (estimated from non-linear asymptote for load and time-limited plotting, Critical_Load), (b) P_TethMLSS and v_MLSS (3 or 4 trials ranging from 95 to 105% of Critical_Load and 85 to 95% of 400-m crawl performance, respectively), (c) an incremental protocol (79-100% of v_400m, with step increments of 3%) to assess velocity at inflexion point (vIP) and, (d) swimming performance of 400 (v_400m), 800 (v_800m) and 1500 (v_1500m) 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 P_TethMLSS (89.2 ± 15.1 W) presented similar potential to explain the variance of performance in v_400m (1.29 ± 0.11 m.s^-1, R² = 0.700), v_800m (1.23 ± 0.12 m.s^-1, R² = 0.770) and v_1500m (1.21 ± 0.12 m.s^-1, R² = 0.698), as well as v_MLSS (1.17 ± 0.11 m.s^-1) and vIP (1.19 ± 0.11 m.s^-1). Blood lactate levels at P_TethMLSS, v_MLSS and 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.

physical fitness; physical endurance; performance tests; lactic,acid; swimming

Modelo		Esforços
MFEL: crawlatado		1^o	2^o	3^o
	*% Carga Crítica_Atada	92,4 ± 3,9	95,4 ± 4,6	98,5 ± 5,2
	*Lactato_final(mmol.L^-1)	3,3 ± 0,6	4,5 ± 1,5	5,4 ± 1,8
	*∆Lactato (mmol.L^-1)	0,2 ± 0,2	0,6 ± 0,6	1,1 ± 0,5
	P_AtadaMFEL(W)	89,2 ± 15,1
	Carga_AtadaMFEL(N)	51,7 ± 5,6
	% Carga Crítica_Atada	96,2 ± 6,2
	Lactato_MFEL(mmol.L^-1)	3,8 ± 0,6
*MFEL: crawldesimpedido*
	%v₄₀₀	86,9 ± 2,2	90,3 ± 1,8	92,8 ± 1,8
	Lactato_final(mmol.L^-1)	2,1 ± 0,8	3,3 ± 1,1	5,1 ± 1,1
	∆Lactato (mmol.L^-1)	0,2 ± 0,2	0,5 ± 0,3	1,3 ± 0 ,6
	v_MFEL(m.s^-1)	1,17 ± 0,11
	%v₄₀₀	90,7 ± 2,2
	Lactato_MFEL(mmol.L^-1)	3,6 ± 1,0

	v₄₀₀(m.s^-1)	v₈₀₀(m.s^-1)	v₁₅₀₀(m.s^-1)	vPI (m.s^-1)	v_MFEL(m.s^-1)
P_AtadaMFEL(W.kg^-1)	0,832**	0,873**	0,833**	0,892**	0,756**
v_MFEL(m.s^-1)	0,963**	0.964**	0,964**	0,892**	-----
vPI (m.s^-1)	0,963**	0,974**	0,956**	-----	-----

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[1] Correspondência: Benedito Sérgio Denadai Laboratório de Avaliação da Performance Huamana, Instituto de Biociência, UNESP. Av 24A, 1515, Bela Vista, Rio Claro, SP, 13.506-900 bdenadai@rc.unespbr