The measurement of lactate threshold in resistance exercise: a comparison of methods.

Autor: de Sousa NM; Programa de Pós-Graduação Interunidades Bioengenharia, EESC/FMRP/IQSC, USP, São Carlos, SP, Brasil. nunosfrade@gmail.com, Magosso RF, Pereira GB, Leite RD, Arakelian VM, Montagnolli AN, Perez SA, Baldissera V
Jazyk: angličtina
Zdroj: Clinical physiology and functional imaging [Clin Physiol Funct Imaging] 2011 Sep; Vol. 31 (5), pp. 376-81. Date of Electronic Publication: 2011 Apr 25.
DOI: 10.1111/j.1475-097X.2011.01027.x
Abstrakt: Resistance incremental tests (IT) make it possible to determine critical metabolic and cardiovascular changes, such as the lactate threshold (LT). Different methods are frequently used to improve the exactness of LT identification. The objective of the study was to identify LT by four different methods (visual inspection, log-log, algorithmic adjustment and QLac) during resistance exercise and to evaluate which methods present more precision. Twelve men performed a maximal IT on the leg press at relative intensities of 10%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80% and 90% of 1RM with 1-min stages. During the 2-min interval between stages, capillary blood was collected for blood lactate analysis. LT was detected using each of the four methods. The intensity of LT by visual inspection method was 26·9 (5·2)% of 1RM, adjustment algorithmic method was 27·8 (3·6)% of 1RM, log-log method was 23·3 (3·5)% of 1RM and QLac method was 31·6 (9·8)% of 1RM, with significant difference only between log-log and QLac methods. Bland and Altman analysis shows better concordance for visual inspection versus adjustment algorithmic methods. The visual inspection, algorithmic and log-log methods detected the LT at the same intensity. The mathematical models, specially the algorithmic method, provide more precision.
(© 2011 The Authors. Clinical Physiology and Functional Imaging © 2011 Scandinavian Society of Clinical Physiology and Nuclear Medicine.)
Databáze: MEDLINE
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