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- Title
Early phase adaptations in muscle strength and hypertrophy as a result of low-intensity blood flow restriction resistance training.
- Authors
Hill, Ethan C.; Housh, Terry J.; Keller, Joshua L.; Smith, Cory M.; Schmidt, Richard J.; Johnson, Glen O.
- Abstract
<bold>Purpose: </bold>Low-intensity venous blood flow restriction (vBFR) resistance training has been shown to promote increases in muscle strength and size. Eccentric-only muscle actions are typically a more potent stimulus to increase muscle strength and size than concentric-only muscle actions performed at the same relative intensities. Therefore, the purpose of this investigation was to examine the time-course of changes in muscle strength, hypertrophy, and neuromuscular adaptations following 4 weeks of unilateral forearm flexion low-intensity eccentric vBFR (Ecc-vBFR) vs. low-intensity concentric vBFR (Con-vBFR) resistance training performed at the same relative intensity.<bold>Methods: </bold>Thirty-six women were randomly assigned to either Ecc-vBFR (n = 12), Con-vBFR (n = 12) or control (no intervention, n = 12) group. Ecc-vBFR trained at 30% of eccentric peak torque and Con-vBFR trained at 30% of concentric peak torque. All training and testing procedures were performed at an isokinetic velocity of 120° s-¹.<bold>Results: </bold>Muscle strength increased similarly from 0 to 2 and 4 weeks of training as a result of Ecc-vBFR (13.9 and 35.0%) and Con-vBFR (13.4 and 31.2%), but there were no changes in muscle strength for the control group. Muscle thickness increased similarly from 0 to 2 and 4 weeks of training as a result of Ecc-vBFR (11.4 and 12.8%) and Con-vBFR (9.1 and 9.9%), but there were no changes for the control group. In addition, there were no changes in any of the neuromuscular responses.<bold>Conclusions: </bold>The Ecc-vBFR and Con-vBFR low-intensity training induced comparable increases in muscle strength and size. The increases in muscle strength, however, were not associated with neuromuscular adaptations.
- Subjects
RESISTANCE training; VENOUS pressure; BLOOD flow; PHYSICAL training &; conditioning; MUSCLE strength; HYPERTROPHY
- Publication
European Journal of Applied Physiology, 2018, Vol 118, Issue 9, p1831
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-018-3918-8