Effect of time-of-day-specific strength training on maximum strength and EMG activity of the leg extensors in men
Deutscher übersetzter Titel: | Einfluss eines tageszeitabhängigen Krafttrainings auf die Maximalkraft und EMG-Aktivität der Beinstrecker bei Männern |
---|---|
Autor: | Sedliak, Milan; Finni, Taija; Peltonen, Jussi; Häkkinen, Keijo |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 26 (2008), 10, S. 1005-1014, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
DOI: | 10.1080/02640410801930150 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201502001146 |
Quelle: | BISp |
Abstract
In this study, we examined the effects of time-of-day-specific strength training on maximum strength and electromyography (EMG) of the knee extensors in men. After a 10-week preparatory training period (training times 17:00–19:00 h), 27 participants were randomized into a morning (07:00–09:00 h, n = 14) and an evening group (17:00–19.00 h, n = 13). Both groups then underwent 10 weeks of time-of-day-specific training. A matched control group (n = 7) completed all testing but did not train. Unilateral isometric knee extension peak torque (MVC) and one-repetition maximum half-squat were assessed before and after the preparatory training and after the time-of-day-specific training at times that were not training-specific (between 09:00 and 16:00 h). During training-specific hours, peak torque and EMG during MVC and submaximum isometric contraction at 40% MVC were assessed before and after the time-of-day-specific training. The main finding was that a significant diurnal difference (P < 0.01) in peak torque between the 07:00 and 17:00 h tests decreased after time-of-day-specific training in the morning group but not in the evening or control groups. However, the extent of this time-of-day-specific adaptation varied between individuals. Electromyography during MVC did not show any time-of-day-specific adaptation, suggesting that peripheral rather than neural adaptations are the main source of temporal specificity in strength training. Verf.-Referat.