Effects of Blood Flow Restricted Low-Intensity Concentric or Eccentric Training on Muscle Size and Strength

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dc.contributor.authorTomohiro Yasudaen_US
dc.contributor.authorJeremy P. Loennekeen_US
dc.contributor.authorRobert S. Thiebauden_US
dc.contributor.authorTakashi Abeen_US
dc.date.accessioned2015-01-23T17:17:43Z
dc.date.accessioned2016-03-30T15:36:20Z
dc.date.available2015-01-23T17:17:43Z
dc.date.available2016-03-30T15:36:20Z
dc.date.issued2012-12-31en_US
dc.descriptionThe authors thank the students who participated in this study. We also thank Toshiaki Nakajima, MD, PhD, Ken Masamune, PhD, Hiroki Kamiuchi, The University of Tokyo, for helpful discussion and technical support.en_US
dc.descriptionConceived and designed the experiments: TY TA. Performed the experiments: TY. Analyzed the data: TY JPL TA. Wrote the paper: TY JPL RST TA.en_US
dc.description.abstractWe investigated the acute and chronic effects of low-intensity concentric or eccentric resistance training with blood flow restriction (BFR) on muscle size and strength. Ten young men performed 30% of concentric one repetition maximal dumbbell curl exercise (four sets, total 75 reps) 3 days/week for 6 weeks. One arm was randomly chosen for concentric BFR (CON-BFR) exercise only and the other arm performed eccentric BFR (ECC-BFR) exercise only at the same exercise load. During the exercise session, iEMG for biceps brachii muscles increased progressively during CON-BFR, which was greater (p<0.05) than that of the ECC-BFR. Immediately after the exercise, muscle thickness (MTH) of the elbow flexors acutely increased (p<0.01) with both CON-BFR and ECC-BFR, but was greater with CON-BFR (11.7%) (p<0.01) than ECC-BFR (3.9%) at 10-cm above the elbow joint. Following 6-weeks of training, MRI-measured muscle cross-sectional area (CSA) at 10-cm position and mid-upper arm (12.0% and 10.6%, respectively) as well as muscle volume (12.5%) of the elbow flexors were increased (p<0.01) with CON-BFR. Increases in muscle CSA and volume were lower in ECC-BFR (5.1%, 0.8% and 2.9%, respectively) than in the CON-BFR and only muscle CSA at 10-cm position increased significantly (p<0.05) after the training. Maximal voluntary isometric strength of elbow flexors was increased (p<0.05) in CON-BFR (8.6%), but not in ECC (3.8%). These results suggest that CON-BFR training leads to pronounced acute changes in muscle size, an index of muscle cell swelling, the response to which may be an important factor for promoting muscle hypertrophy with BFR resistance training.en_US
dc.description.peerreviewYesen_US
dc.description.peerreviewnoteshttp://www.plosone.org/static/editorial#peeren_US
dc.identifier.citationYasuda T, Loenneke JP, Thiebaud RS, Abe T (2012) Effects of Blood Flow Restricted Low-Intensity Concentric or Eccentric Training on Muscle Size and Strength. PLoS ONE 7(12): e52843. doi:10.1371/journal.pone.0052843en_US
dc.identifier.doi10.1371/journal.pone.0052843en_US
dc.identifier.urihttp://hdl.handle.net/11244/14087
dc.language.isoen_USen_US
dc.publisherPLos Oneen_US
dc.relation.ispartofseriesPLoS ONE 7(12):e52843en_US
dc.relation.urihttp://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0052843en_US
dc.rightsAttribution 3.0 United Statesen_US
dc.rights.requestablefalseen_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/en_US
dc.subjectPLOSen_US
dc.subjectPublic Library of Scienceen_US
dc.subjectOpen Accessen_US
dc.subjectOpen-Accessen_US
dc.subjectScienceen_US
dc.subjectMedicineen_US
dc.subjectBiologyen_US
dc.subjectResearchen_US
dc.subjectPeer-reviewen_US
dc.subjectInclusiveen_US
dc.subjectInterdisciplinaryen_US
dc.subjectAnte-disciplinaryen_US
dc.subjectPhysicsen_US
dc.subjectChemistryen_US
dc.subjectEngineeringen_US
dc.titleEffects of Blood Flow Restricted Low-Intensity Concentric or Eccentric Training on Muscle Size and Strengthen_US
dc.typeResearch Articleen_US

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