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Effects of body position and loading modality on muscle activity and strength in shoulder presses.
MedLine Citation:
PMID:  23096062     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT: Little is known about the effect of performing upper-body resistance exercises with dumbbells versus barbells and standing versus seated. Therefore, this study sought to compare electromyogram activity (EMG) and one-repetition maximum (1-RM) in barbell and dumbbell shoulder presses performed seated and standing. 15 healthy men volunteered for 1-RM and EMG testing with a load corresponding to 80% of the 1-RM. EMG was measured in the anterior, medial and posterior deltoids, and biceps and triceps brachii. The following EMG differences or trends were observed: For deltoid anterior: ∼11% lower for seated barbell versus dumbbell (P=0.038), ∼15% lower in standing barbell versus dumbbell (P<0.001), ∼8% lower for seated versus standing dumbbells (P=0.070); For medial deltoid, ∼7% lower for standing barbell versus dumbbells (P=0.050), ∼7% lower for seated versus standing barbell (P=0.062), 15% lower for seated versus standing dumbbell (P=0.008); For posterior deltoid: ∼25% lower for seated versus standing barbell (P<0.001), ∼24% lower for seated versus standing dumbbells (P=0.002); For biceps, ∼33% greater for seated barbell versus dumbbells (P=0.002), 16% greater for standing barbell versus dumbbell (P=0.074), ∼23% lower for seated versus standing dumbbells (P<0.001); For triceps, ∼39% greater for standing barbell versus dumbbells (P<0.001), ∼20% lower for seated versus standing barbell (P=0.094). 1-RM strength for standing dumbbells was ∼7% lower than standing barbell (P=0.002) and ∼10% lower than seated dumbbells (P<0.001). In conclusion, the exercise with the greatest stability requirement (standing and dumbbells) demonstrated the highest neuromuscular activity of the deltoid muscles, although this was the exercise with the lowest 1-RM strength.
Authors:
Atle Hole Saeterbakken; Marius Steiro Fimland
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-23
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Faculty of Teacher Education and Sport, Sogn og Fjordane University College, Norway. 2Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway. 3Hysnes Rehabilitation Center, St. Olavs University Hospital, Trondheim, Norway.
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