Blood Flow Restriction Combined with Electrical Stimulation Attenuates Thigh Muscle Disuse Atrophy
| Autor: | Robert King, Jamie F. Burr, Joshua T. Slysz, Geoffrey A. Power, Christopher Pignanelli, Matthew Boston |
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| Rok vydání: | 2020 |
| Předmět: |
Male
Electrical muscle stimulation medicine.medical_treatment Physical Therapy Sports Therapy and Rehabilitation Stimulation Muscle mass Blood flow restriction Quadriceps Muscle Immobilization Young Adult 03 medical and health sciences Absorptiometry Photon 0302 clinical medicine Occlusion Humans Medicine Orthopedics and Sports Medicine Muscle Strength Ultrasonography business.industry Thigh muscle 030229 sport sciences Tourniquets Electric Stimulation Muscular Disorders Atrophic Thigh Regional Blood Flow Anesthesia Lean body mass Female business Disuse atrophy |
| Zdroj: | Medicine & Science in Sports & Exercise. 53:1033-1040 |
| ISSN: | 1530-0315 0195-9131 |
| Popis: | This study aimed 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.Thirty healthy participants (22 ± 3 yr; 23 ± 3 kg·m-2) were randomly assigned to 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 d, with no treatment (CON), or while treated with either BFR or BFR + EMS (twice daily, 5 d·wk-1). BFR treatment involved arterial three cycles of 5-min occlusion using suprasystolic pressure, each separated by 5 min of reperfusion. EMS (6 s on, 15 s off; 200 μs; 60 Hz; 15% maximal voluntary contraction [MVC]) was applied continuously throughout the three BFR cycles. Quadriceps muscle mass (whole-thigh lean mass via dual-energy x-ray absorptiometry and vastus lateralis [VL] muscle thickness via ultrasound) and strength (via knee extension MVC) were assessed before and after the 14-d unloading period.After limb unloading, whole-thigh lean mass decreased in the control group (-4% ± 1%, P0.001) 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 (P0.005) in the control group (-18% ± 15%), BFR group (-10% ± 13%), and BFR + EMS group (-18% ± 15%), with no difference between groups (P0.5).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. |
| Databáze: | OpenAIRE |
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