Isokinetic and isometric muscle function of the knee extensors and flexors during simulated soccer activity : effect of exercise and dehydration
Deutscher übersetzter Titel: | Isokinetische und isometrische Muskelfunktion der Knie-Streck- und Beugemuskeln während einer simulierten Fußballaktivität : Wirkung der Übungen und der Dehydration |
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Autor: | Ali, Ajmol; Williams, Clyde |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 31 (2013), 8, S. 907-916, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
DOI: | 10.1080/02640414.2012.753635 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201305003791 |
Quelle: | BISp |
Abstract
This study investigated the influence of dehydration during soccer-type intermittent exercise on isokinetic and isometric muscle function. Eight soccer players performed two 90-min high-intensity intermittent shuttle-running trials without (NF) or with (FL) fluid ingestion (5 ml · kg−1 before and 2 ml · kg−1 every 15 min). Isokinetic and isometric strength and muscular power of knee flexors and knee extensors were measured pre-exercise, at half-time and post-exercise using isokinetic dynamometry. Sprint performance was monitored throughout the simulated-soccer exercise. Isokinetic knee strength was reduced at faster (3.13 rad · s−1; P = 0.009) but not slower (1.05 rad · s−1; P = 0.063) contraction speeds with exercise; however, there was no difference between FL and NF. Peak isometric strength of the knee extensors (P = 0.002) but not the knee flexors (P = 0.065) was significantly reduced with exercise with no difference between FL and NF. Average muscular power was reduced over time at both 1.05 rad · s−1 (P = 0.01) and 3.14 rad · s−1 (P = 0.033) but was not different between FL and NF. Mean 15-m sprint time increased with duration of exercise (P = 0.005) but was not different between FL and NF. In summary, fluid ingestion during 90 min of soccer-type exercise was unable to offset the reduction in isokinetic and isometric strength and muscular power of the knee extensors and flexors. Verf.-Referat