Abstract:
PURPOSE:To investigate the effects of blood flow restriction (BFR) combined with electrical muscle stimulation (EMS) on skeletal muscle mass and strength during a period of limb disuse. METHODS:Thirty healthy participants (22 ± 3 years; 23 ± 3 kg·m) were randomly assigned to either: control (CON; n=10), BFR alone (BFR; n=10), or BFR combined with EMS (BFR+EMS; n=10). All participants completed unloading of a single-leg for 14-days, with no treatment (CON), or while treated with either BFR, or BFR+EMS (twice daily, 5 day/week). BFR treatment involved arterial 3 cycles of 5 min occlusion using suprasystolic pressure, each separated by 5-min of reperfusion. EMS (6s on, 15s off; 200 μs; 60Hz; 15 % MVC) was applied continuously throughout the 3 BFR cycles. Quadriceps muscle mass (whole thigh lean mass via DEXA and Vastus Lateralis (VL) muscle thickness via ultrasound) and strength (via knee-extension maximal voluntary contraction (MVC)) were assessed before and after the 14-day unloading period. RESULTS:Following limb unloading, whole thigh lean mass decreased in the control (-4 ± 1%; p < 0.001) and BFR group (-3 ± 2%; p = 0.001), but not in the BFR+EMS group (-0.3 ± 3%; p = 0.8). VL muscle thickness decreased in the control group (-4 ± 4%; p = 0.005), and was trending toward a decrease in the BFR group (-8 ± 11%; p = 0.07) and increase in the BFR+EMS group (+5 ± 10%; p = 0.07). Knee-extension MVC decreased over time (p < 0.005) in the control (-18 ± 15%), BFR group (-10 ± 13%), and BFR+EMS (-18 ± 15%) group, with no difference between groups (p > 0.5). CONCLUSION:Unlike BFR performed in isolation, BFR+EMS represents an effective interventional strategy to attenuate the loss of muscle mass during limb disuse, but it does not demonstrate preservation of strength.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Slysz JT,Boston M,King R,Pignanelli C,Power GA,Burr JFdoi
10.1249/MSS.0000000000002544subject
Has Abstractpub_date
2020-10-22 00:00:00eissn
0195-9131issn
1530-0315pub_type
杂志文章abstract:PURPOSE:This article reports on the findings and recommendations of the "Physiology of Sedentary Behavior and Its Relationship to Health Outcomes" group, a part of a larger workshop entitled Sedentary Behavior: Identifying Research Priorities sponsored by the National Heart, Lung, and Blood Institute and by the Nationa...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000518
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abstract::It has been suggested that television watching and physical activity are related to obesity. This association, however, has been investigated mainly in children. This study provided the opportunity to examine the relationship between television watching, physical activity, and body mass index in adult Pima Indians, a ...
journal_title:Medicine and science in sports and exercise
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abstract::Throughout a beat swinging motion prior to a kip the gymnast changes the relative orientation of his legs and head-torso with respect to his arms. It was observed that if these changes occurred in a correct order he could rapidly increase his swing with his limited strength. If changes in orientation of the body parts...
journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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pub_type: 杂志文章,随机对照试验
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journal_title:Medicine and science in sports and exercise
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更新日期:1980-01-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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更新日期:1993-12-01 00:00:00
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更新日期:2016-03-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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doi:
更新日期:1993-02-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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