Effect of different types of conditioning contraction on upper body postactivation potentiation

Esformes, Joseph, Keenan, Matthew, Moody, Jeremy and Bampouras, Theodoros (2011) Effect of different types of conditioning contraction on upper body postactivation potentiation. Journal of Strength and Conditioning Research, 25 (1). pp. 143-148. Full text not available from this repository.

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Abstract

Muscle contractions preceding an activity can result in increased force generation (postactivation potentiation [PAP]). Although the type of muscular contractions could affect subsequent strength and power performance, little information exists on their effects. The purpose of this study was to examine PAP effects produced by isometric (ISO), concentric (CON), eccentric (ECC), or concentric-eccentric (DYN) conditioning contractions on upper body force and power performance. Ten male, competitive rugby players (mean ± SD: age 20.4 ± 0.8 years, height 177.0 ± 8.1 cm, body mass 90.2 ± 13.8 kg) performed a ballistic bench press throw (BBPT) followed by a 10-minute rest and one of the conditioning contractions. After a 12-minute rest, the subjects performed another BBPT (postBBPT). The conditioning contractions, applied on separate days and in counterbalanced randomized order, were a 7-second isometric barbell bench press for ISO and 1 set of 3 bench press repetitions at 3 repetition maximum for CON, ECC, and DYN (each repetition lasting 2 seconds for CON and ECC, overall execution time <7 seconds for DYN). Peak power (P^sub peak^), peak force (F^sub peak^), maximum distance (D^sub max^) and rate of force development (RFD) were measured using a linear position transducer. Electromyography (EMG) of the pectoralis major and triceps brachii was also recorded. The ISO produced significantly higher P^sub peak^ (587 ± 116 and 605 ± 126 W for preand post-BBPT, respectively; p < 0.05). No significant differences in P^sub peak^ were revealed for CON, ECC, and DYN (p > 0.05), and no significant differences existed in F^sub peak^, D^sub max^, and RFD for ISO, CON, ECC, and DYN (p > 0.05). Finally, EMG was not significantly different between pre- and postBBPT for any of the conditioning contractions (p > 0.05). Isometric contractions appear to be the only conditioning contractions increasing upper body power output after long resting periods.

Item Type: Article
Journal or Publication Title: Journal of Strength and Conditioning Research
Publisher: Lippincott, Williams and Wilkins
ISSN: 1064-8011
Departments: Faculty of Health and Science > Medical and Sports Sciences > Sports and Physical Activity
Depositing User: Insight Administrator
Date Deposited: 06 Feb 2012 15:31
Last Modified: 26 Aug 2016 16:09
URI: http://insight.cumbria.ac.uk/id/eprint/1217

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