Effects of exercise intensity and occlusion pressure after 12 weeks of resistance training with blood-flow restriction.

Abstract:

PURPOSE:We compared the effects of different protocols of blood-flow restriction training (BFRT) with different occlusion pressures and/or exercise intensities on muscle mass and strength. We also compared BFRT protocols with conventional high-intensity resistance training (RT). METHODS:Twenty-six subjects had each leg allocated to two of five protocols. BFRT protocols were performed at either 20 or 40 % 1-RM with either 40 or 80 % occlusion pressure: BFRT20/40, BFRT20/80, BFRT40/40, and BFRT40/80. Conventional RT was performed at 80 % 1-RM (RT80) without blood-flow restriction. Maximum dynamic strength (1-RM) and quadriceps cross-sectional area (CSA) were assessed at baseline and after 12 weeks. RESULTS:Regarding muscle mass, increasing occlusion pressure was effective only at very low intensity (BFRT20/40 0.78 % vs. BFRT20/80 3.22 %). No additional increase was observed at higher intensities (BFRT40/40 4.45 % vs. BFRT40/80 5.30 %), with no difference between the latter protocols and RT80 (5.90 %). Exercise intensity played a role in CSA when comparing groups with similar occlusion pressure. Muscle strength was similarly increased among BFRT groups (~12.10 %) but to a lesser extent than RT80 (21.60 %). CONCLUSION:In conclusion, BFRT protocols benefit from higher occlusion pressure (80 %) when exercising at very low intensities. Conversely, occlusion pressure seems secondary to exercise intensity in more intense (40 % 1-RM) BFRT protocols. Finally, when considering muscle strength, BFRT protocols seem less effective than high-intensity RT.

journal_name

Eur J Appl Physiol

authors

Lixandrão ME,Ugrinowitsch C,Laurentino G,Libardi CA,Aihara AY,Cardoso FN,Tricoli V,Roschel H

doi

10.1007/s00421-015-3253-2

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

2471-80

issue

12

eissn

1439-6319

issn

1439-6327

pii

10.1007/s00421-015-3253-2

journal_volume

115

pub_type

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