Affordable Access

deepdyve-link deepdyve-link
Publisher Website

Muscular outputs during dynamic bench press under stable versus unstable conditions.

Authors
Type
Published Article
Journal
Journal of strength and conditioning research / National Strength & Conditioning Association
Publication Date
Volume
22
Issue
5
Pages
1584–1588
Identifiers
DOI: 10.1519/JSC.0b013e31817b03a1
PMID: 18714228
Source
Medline
License
Unknown

Abstract

Previous studies have suggested that resistance training exercise under unstable conditions decreases the isometric force output, yet little is known about its influence on muscular outputs during dynamic movement. The objective of this study was to investigate the effect of an unstable condition on power, force, and velocity outputs during the bench press. Twenty male collegiate athletes (mean age, 21.3 +/- 1.5 years; mean height, 167.7 +/- 7.7 cm; mean weight, 75.9 +/- 17.5 kg) participated in this study. Each subject attempted 3 sets of single bench presses with 50% of 1 repetition maximum (1RM) under a stable condition with a flat bench and an unstable condition with a Swiss ball. Acceleration data were obtained with an accelerometer attached to the center of a barbell shaft, and peak outputs of power, force, and velocity were computed. Although significant loss of the peak outputs was found under the unstable condition (p < 0.017), their reduction rates remained relatively low, approximately 6% for force and 10% for power and velocity outputs, compared with previous findings. Such small reduction rates of muscular outputs may not compromise the training effect. Prospective studies are necessary to confirm whether the resistance training under an unstable condition permits the improvement of dynamic performance and trunk stability.

Statistics

Seen <100 times