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      Time course for arm and chest muscle thickness changes following bench press training

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          Abstract

          The purpose of this study was to investigate the time course of hypertrophic adaptations in both the upper arm and trunk muscles following high-intensity bench press training. Seven previously untrained young men (aged 25±3 years) performed free-weight bench press training 3 days (Monday, Wednesday and Friday) per week for 24 weeks. Training intensity and volume were set at 75% of one repetition maximum (1-RM) and 30 repetitions (3 sets of 10 repetitions, with 2–3 min of rest between sets), respectively. Muscle thickness (MTH) was measured using B-mode ultrasound at three sites: the biceps and triceps brachii and the pectoralis major. Measurements were taken a week prior to the start of training, before the training session on every Monday and 3 days after the final training session. Pairwise comparisons from baseline revealed that pectoralis major MTH significantly increased after week-1 ( p=0.002), triceps MTH increased after week-5 ( p=0.001) and 1-RM strength increased after week-3 ( p=0.001) while no changes were observed in the biceps MTH from baseline. Significant muscle hypertrophy was observed earlier in the chest compared to that of the triceps. Our results indicate that the time course of the muscle hypertrophic response differs between the upper arm and chest.

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          Author and article information

          Journal
          1646
          121666
          Interventional Medicine and Applied Science
          IMAS
          Akadémiai Kiadó, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic Publishers B.V.
          2061-1617
          2061-5094
          1 December 2012
          : 4
          : 4
          : 217-220
          Affiliations
          [ 1 ] Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba, Japan
          [ 2 ] Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA
          [ 3 ] Department of Health, Exercise Science and Recreation Management, University of Mississippi, Oxford, MS, USA
          [ 4 ] Department of Health, Exercise Science and Recreation Management, University of Mississippi, 215 Turner Center, Oxford, MS, 38677, USA
          Author notes
          [* ] +1-662-915-5521, +1-662-915-5525, t12abe@ 123456gmail.com
          Article
          7
          10.1556/imas.4.2012.4.7
          3831787
          24265879
          af9aa4c9-5e9b-4afa-83f5-499ea4ac59f6
          Categories
          Original Paper

          Medicine,Immunology,Health & Social care,Microbiology & Virology,Infectious disease & Microbiology
          trunk muscle thickness,muscle hypertrophy,strength training,muscular strength,B-mode ultrasound

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