NDLI: An evaluation of upper-body muscle activation during coupled and uncoupled instability resistance training.

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An evaluation of upper-body muscle activation during coupled and uncoupled instability resistance training.

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An evaluation of upper-body muscle activation during coupled and uncoupled instability resistance training.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Campbell, Brian M. Kutz, Matt R. Morgan, Amy L. Fullenkamp, Adam M. Ballenger, Ryan
Description	Author Affiliation: Campbell BM ( Biomechanics/Motor Behavior Laboratory, School of Human Movement, Sport and Leisure Studies, Bowling Green State University, Bowling Green, Ohio.)
Abstract	Recently, there has been a growth in the popularity of resistance exercises performed on unstable surfaces. However, the relationship between unstable surface training and load coupling on muscle activation is unclear. The purpose of this study was to evaluate changes in muscle activation during a barbell (BB) (coupled) and dumbbell (DB) (uncoupled) chest press exercise performed on an unstable surface. The 3 specific chest press conditions included 50% 1 repetition maximum (RM) with BB (50% BB), 50% 1RM with DBs (50% DB), and 25% 1RM with DBs (25% DB). Ten male subjects participated in the study (age, 23.9 ± 2.6 years; body weight, 82.8 ± 10.2 kg). During testing, mean electromyographic activity was assessed for pectoralis major (PM), triceps brachii, anterior deltoid (AD), and rectus abdominis (RA) and was presented as a percent change across the lifting conditions. It was observed that muscle activation increased by 15% in both the PM and RA from the 50% BB condition to the 50% DB condition. Also, the greatest percent difference in muscle activation between the 50 and 25% DB conditions occurred for PM and AD (+54% during 50% DB). These results suggest that demands on the core musculature to provide stability are increased with the use of DBs (uncoupled) as opposed to a BB (coupled). Where instability training provides a sufficient hypertrophy stimulus in prime mover muscle groups, there may be the added benefit of core stability training. Specifically, this type of training may benefit both untrained persons and those engaged in active rehabilitation.
File Format	HTM / HTML
ISSN	10648011
Issue Number	7
Volume Number	28
e-ISSN	15334287
Journal	Journal of Strength and Conditioning Research
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2014-07-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Sport Sciences Muscle Contraction Physiology Muscle, Skeletal Postural Balance Resistance Training Methods Weight Lifting Adult Deltoid Muscle Electromyography Humans Male Pectoralis Muscles Rectus Abdominis Young Adult Journal Article
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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