| The sticking region in three chest-press exercises with increasing degrees of freedom. | |
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MedLine Citation:
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PMID: 22158100 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The purpose was to investigate the effect of three chest-press exercises with different degrees of freedom upon the sticking region and muscle activity in maximal attempts. It was hypothesized that, with increasing degrees of freedom the sticking region (the weakest region during the lift) would be longer since the muscles need to use a part of their ability to control this increasing degrees of freedom during the exercise. Furthermore, the prime movers would have the same muscle activity, but the biceps muscle activity would increase when the degrees of freedom increases due to the enhanced control of the upwards movement. Eleven male subjects (age 22.6 ± 1.7 yrs, body mass 78.6 ± 8.0 kg, stature 1.80 ± 0.07 m) with at least one year of bench press training experience participated in this study. Every subject was tested in 1-RM in the three chest-press exercises. During the attempts kinematics and muscle activity were recorded and analyzed in four different regions (downwards, pre-, sticking and post-sticking). The participants achieved the highest 1-RM strength using the free barbell (106.4±15.5 kg), followed by the Smith machine (103.6±14.8 kg) and dumbbells (89.5±13.7 kg). Furthermore, muscle activity differences (EMG) between the three different exercises and the muscle activation between the four different regions were found. The length of the different lifting regions together with muscle activity was different between the exercises. However, the differences found did not follow the line of increasing degrees of freedom that would result in a longer sticking region. Therefore it is possible to choose to train a particular chest press exercise with the purpose of training a particular muscle more than the others. |
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Authors:
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Roland van den Tillaar; Atle Sætersbakken |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-08 |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: - ISSN: 1533-4287 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 Department of Teacher Education of Nord Trøndelag University College, Norway; 2 Research Centre for Sport, Health and Human Development, Villa Real, Portugal; 3 Department of Teacher Education and Sport of Sogn and Fjrodane University College, Norway. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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