Low-load blood flow restriction elicits greater concentric strength than non-blood flow restriction resistance training but similar isometric strength and muscle ... View Full Text


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Article Info

DATE

2019-12-17

AUTHORS

Ethan C. Hill, Terry J. Housh, Joshua L. Keller, Cory M. Smith, John V. Anders, Richard J. Schmidt, Glen O. Johnson, Joel T. Cramer

ABSTRACT

PurposeLow-load venous blood flow restriction resistance training (RT + BFR) has been demonstrated to increase muscle strength to a greater degree than low-load non-BFR resistance training (RT) during isotonic training, but no previous investigations have examined RT + BFR versus RT during isokinetic training. The purpose of the present study was to examine the effects of 4 weeks of isokinetic low-load RT + BFR versus low-load RT on indices of muscle strength, muscle size, and neural adaptations.MethodsThirty women (mean ± SD; 22 ± 2 years) participated in this investigation and were randomly assigned to 4 weeks of either RT + BFR (n = 10), RT (n = 10), or control (n = 10) group. Resistance training consisted of 75 reciprocal forearm flexion–extension isokinetic muscle actions of the forearm flexors performed at a velocity of 120°s−1.ResultsConcentric peak torque increased to a greater extent for RT + BFR after 4 weeks (36.9%) compared to RT (25.8%), but there were similar increases in isometric torque (23.3–42.1%). For both RT + BFR and RT, there were similar increases in muscle cross-sectional area and muscle thickness of the biceps brachii after 2 weeks (11.3–14.3% and 12.4–12.9%, respectively) and 4 weeks (18.7–21.9% and 19.0–20.0%, respectively). There were similar increases in mechanomyographic amplitude, mechanomyographic mean power frequency, and electromyographic mean power frequency, but no changes in electromyographic amplitude for all conditions (including control).ConclusionsThese findings indicated that low-load RT + BFR elicited greater increases in concentric strength than low-load RT, but elicited comparable increases in isometric strength and muscle size. There were also no differences in any of the EMG and MMG responses among conditions. More... »

PAGES

425-441

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00421-019-04287-3

    DOI

    http://dx.doi.org/10.1007/s00421-019-04287-3

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/31848703


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    29 schema:description PurposeLow-load venous blood flow restriction resistance training (RT + BFR) has been demonstrated to increase muscle strength to a greater degree than low-load non-BFR resistance training (RT) during isotonic training, but no previous investigations have examined RT + BFR versus RT during isokinetic training. The purpose of the present study was to examine the effects of 4 weeks of isokinetic low-load RT + BFR versus low-load RT on indices of muscle strength, muscle size, and neural adaptations.MethodsThirty women (mean ± SD; 22 ± 2 years) participated in this investigation and were randomly assigned to 4 weeks of either RT + BFR (n = 10), RT (n = 10), or control (n = 10) group. Resistance training consisted of 75 reciprocal forearm flexion–extension isokinetic muscle actions of the forearm flexors performed at a velocity of 120°s−1.ResultsConcentric peak torque increased to a greater extent for RT + BFR after 4 weeks (36.9%) compared to RT (25.8%), but there were similar increases in isometric torque (23.3–42.1%). For both RT + BFR and RT, there were similar increases in muscle cross-sectional area and muscle thickness of the biceps brachii after 2 weeks (11.3–14.3% and 12.4–12.9%, respectively) and 4 weeks (18.7–21.9% and 19.0–20.0%, respectively). There were similar increases in mechanomyographic amplitude, mechanomyographic mean power frequency, and electromyographic mean power frequency, but no changes in electromyographic amplitude for all conditions (including control).ConclusionsThese findings indicated that low-load RT + BFR elicited greater increases in concentric strength than low-load RT, but elicited comparable increases in isometric strength and muscle size. There were also no differences in any of the EMG and MMG responses among conditions.
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    36 BFR resistance training
    37 ConclusionsThese findings
    38 EMG
    39 MMG responses
    40 MethodsThirty women
    41 action
    42 adaptation
    43 amplitude
    44 area
    45 biceps brachii
    46 blood flow restriction resistance training
    47 brachii
    48 changes
    49 comparable increase
    50 concentric strength
    51 conditions
    52 control group
    53 cross-sectional area
    54 degree
    55 differences
    56 effect
    57 electromyographic amplitude
    58 electromyographic mean power frequency
    59 extent
    60 findings
    61 flexors
    62 forearm flexors
    63 frequency
    64 greater degree
    65 greater extent
    66 greater increase
    67 group
    68 increase
    69 index
    70 investigation
    71 isokinetic muscle actions
    72 isokinetic training
    73 isometric strength
    74 isometric torque
    75 isotonic training
    76 low-load resistance training
    77 mean power frequency
    78 mechanomyographic amplitude
    79 muscle actions
    80 muscle cross-sectional area
    81 muscle size
    82 muscle strength
    83 muscle thickness
    84 neural adaptation
    85 peak torque
    86 power frequency
    87 present study
    88 previous investigations
    89 purpose
    90 resistance training
    91 response
    92 similar increase
    93 size
    94 strength
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    102 schema:name Low-load blood flow restriction elicits greater concentric strength than non-blood flow restriction resistance training but similar isometric strength and muscle size
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