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Circ Heart Fail. 2019 Dec;12(12):e006427. doi: 10.1161/CIRCHEARTFAILURE.119.006427. Epub 2019 Dec 13.

Effect of Blood Flow Restricted Resistance Exercise and Remote Ischemic Conditioning on Functional Capacity and Myocellular Adaptations in Patients With Heart Failure.

Author information

1
Section for Sports Science, Department of Public Health, Aarhus University, Aarhus, Denmark (T.G., P.S., J.W., C.R.C., K.V.).
2
Department of Cardiology (R.N., K.P., N.R.J., M.R.S., H.E.B.), Aarhus University Hospital, Denmark.
3
Department of Biomedicine (F.V.d.P.), Aarhus University Hospital, Denmark.
4
Department of Cardiothoracic and Vascular Surgery (F.V.d.P.), Aarhus University Hospital, Denmark.
5
Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City (B.F.M.).

Abstract

BACKGROUND:

Patients with congestive heart failure (CHF) have impaired functional capacity and inferior quality of life. The clinical manifestations are associated with structural and functional impairments in skeletal muscle, emphasizing a need for feasible rehabilitation strategies beyond optimal anticongestive medical treatment. We investigated whether low-load blood flow restricted resistance exercise (BFRRE) or remote ischemic conditioning (RIC) could improve functional capacity and quality of life in patients with CHF and stimulate skeletal muscle myofibrillar and mitochondrial adaptations.

METHODS:

We randomized 36 patients with CHF to BFRRE, RIC, or nontreatment control. BFRRE and RIC were performed 3× per week for 6 weeks. Before and after intervention, muscle biopsies, tests of functional capacity, and quality of life assessments were performed. Deuterium oxide was administered throughout the intervention to measure cumulative RNA and subfraction protein synthesis. Changes in muscle fiber morphology and mitochondrial respiratory function were also assessed.

RESULTS:

BFRRE improved 6-minute walk test by 39.0 m (CI, 7.0-71.1, P=0.019) compared with control. BFRRE increased maximum isometric strength by 29.7 Nm (CI, 10.8-48.6, P=0.003) compared with control. BFRRE improved quality of life by 5.4 points (CI, -0.04 to 10.9; P=0.052) compared with control. BFRRE increased mitochondrial function by 19.1 pmol/s per milligram (CI, 7.3-30.8; P=0.002) compared with control. RIC did not produce similar changes.

CONCLUSIONS:

Our results demonstrate that BFRRE, but not RIC, improves functional capacity, quality of life, and muscle mitochondrial function. Our findings have clinical implications for rehabilitation of patients with CHF and provide new insights on the myopathy accompanying CHF.

CLINICAL TRIAL REGISTRATION:

URL: https://www.clinicaltrials.gov. Unique identifier: NCT03380663.

KEYWORDS:

deuterium oxide; exercise; heart failure; mitochondria; quality of life

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