Blood Flow Restriction Combined with Electrical Stimulation Attenuates Thigh Muscle Disuse Atrophy.

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 Exerc

authors

Slysz JT,Boston M,King R,Pignanelli C,Power GA,Burr JF

doi

10.1249/MSS.0000000000002544

subject

Has Abstract

pub_date

2020-10-22 00:00:00

eissn

0195-9131

issn

1530-0315

pub_type

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