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European Journal of Applied Physiology

Published in:

01-09-2018 | Original Article

Early phase adaptations in muscle strength and hypertrophy as a result of low-intensity blood flow restriction resistance training

Authors: Ethan C. Hill, Terry J. Housh, Joshua L. Keller, Cory M. Smith, Richard J. Schmidt, Glen O. Johnson

Published in: European Journal of Applied Physiology | Issue 9/2018

Abstract

Purpose

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.

Methods

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.

Results

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.

Conclusions

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.

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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: Ethan C. Hill
Terry J. Housh
Joshua L. Keller
Cory M. Smith
Richard J. Schmidt
Glen O. Johnson
Publication date: 01-09-2018
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 9/2018
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-018-3918-8

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Early phase adaptations in muscle strength and hypertrophy as a result of low-intensity blood flow restriction resistance training

Abstract

Purpose

Methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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