Document Detail

Evaluation of muscle activity during a standardized shoulder resistance training bout in novice individuals.
MedLine Citation:
PMID:  22067242     Owner:  NLM     Status:  Publisher    
Momentary fatigue is an important variable in resistance training periodization programs. Although several studies have examined neuromuscular activity during single repetitions of resistance training, information is lacking in regard to neuromuscular fatigue indices throughout a full resistance training bout. The purpose of this study was to evaluate muscle activity during a shoulder resistance training bout with 15 repetitions maximum (RM) loadings in novice individuals. 12 healthy sedentary women (age = 27-58 years; weight = 54-85 kg; height = 160-178 cm) were recruited for this study. Normalized electromyographic activity (nEMG) and median power frequency (MPF) of the upper, medial and lower trapezius, the medial deltoid, infraspinatus and serratus anterior was measured during 3 sets of 15 RM during the exercises front raise, reverse flyes, shrugs and lateral raise. For the majority of exercises nEMG activity was high (>60% of MVC). From the first to the last repetition of each set nEMG - averaged for all muscles - increased 10.0+0.4% (P<0.05) and MPF decreased -7.7+0.5 Hz (P<0.05). By contrast, nEMG and MPF was unchanged from first to third set (averaged for all muscles: 38.1+23.6% vs 47.6+28.8% and 88.4+21.3 Hz vs 82.1+18.1 Hz respectively). In conclusion, during a shoulder resistance training bout in novice individuals using 15 RM loading muscle activity of the upper, medial and lower trapezius, the medial deltoid, infraspinatus and serratus anterior increased and median power frequency decreased within each set - indicating momentary neuromuscular fatigue. By contrast, no such change was observed between the three sets. This indicates that momentary neuromuscular fatigue in shoulder resistance training is induced more efficiently within a set than between sets.
Markus Due Jakobsen; Emil Sundstrup; Christoffer H Andersen; Mette K Zebis; Peter Mortensen; Lars L Andersen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-05
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-9     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:  -    
1National Research Centre for the Working Environment, Copenhagen, Denmark; 2Novozymes, Bagsværd, Denmark; 3Institute of Sport Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.
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