Step length and individual anaerobic threshold assessment in swimming
Deutscher übersetzter Titel: | Stufenlänge und individuelle Bestimmung der anaeroben Schwelle im Schwimmen |
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Autor: | Fernandes, Ricardo J.; Sousa, M.; Machado, L.; Vilas-Boas, J.P. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 32 (2011), 12, S. 940-946, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-0031-1283189 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201203001316 |
Quelle: | BISp |
Abstract
Anaerobic threshold is widely used for diagnosis of swimming aerobic endurance but the precise incremental protocols step duration for its assessment is controversial. A physiological and biomechanical comparison between intermittent incremental protocols with different step lengths and a maximal lactate steady state (MLSS) test was conducted. 17 swimmers performed 7×200, 300 and 400 m (30 s and 24 h rest between steps and protocols) in front crawl until exhaustion and an MLSS test. The blood lactate concentration values ([La-]) at individual anaerobic threshold were 2.1±0.1, 2.2±0.2 and 1.8±0.1 mmol.l − 1 in the 200, 300 and 400 m protocols (with significant differences between 300 and 400 m tests), and 2.9±1.2 mmol.l − 1 at MLSS (higher than the incremental protocols); all these values are much lower than the traditional 4 mmol.l − 1 value. The velocities at individual anaerobic threshold obtained in incremental protocols were similar (and highly related) to the MLSS, being considerably lower than the velocity at 4 mmol.l − 1. Stroke rate increased and stroke length decreased throughout the different incremental protocols. It was concluded that it is valid to use intermittent incremental protocols of 200 and 300 m lengths to assess the swimming velocity corresponding to individual anaerobic threshold, the progressive protocols tend to underestimate the [La-] at anaerobic threshold assessed by the MLSS test, and swimmers increase velocity through stroke rate increases. Verf.-Referat