心不全患者の筋萎縮予防に有酸素運動が有効

メディカルトリビューンの2012年7月5日号の5ページに「心不全患者の筋萎縮予防に有酸素運動が有効」という記事が掲載されています。以下の論文を紹介していて、心臓リハは有用としています。

Gielen S, Sandri M, Kozarez I, Kratzsch J, Teupser D, Thiery J, Erbs S, Mangner N, Lenk K, Hambrecht R, Schuler G, Adams V.　Exercise Training Attenuates MuRF-1 Expression in the Skeletal Muscle of Patients With Chronic Heart Failure Independent of Age: The Randomized Leipzig Exercise Intervention in Chronic Heart Failure and Aging Catabolism Study.　Circulation. 2012 Jun 5;125(22):2716-27.

サルコペニアや悪液質に対して、レジスタンストレーニングだけでなく有酸素運動も有用という報告があります。今回は、心臓悪液質に対する有酸素運動の有用性を示しているものを考えます。

Abstract

BACKGROUND:

Muscle wasting occurs in both chronic heart failure (CHF) and normal aging and contributes to exercise intolerance and increased morbidity/mortality. However, the molecular mechanisms of muscle atrophy in CHF and their interaction with aging are still largely unknown. We therefore measured the activation of the ubiquitin-proteasome system and the lysosomal pathway of intracellular proteolysis in muscle biopsies of CHF patients and healthy controls in two age strata and assessed the age-dependent effects of a 4-week endurance training program on the catabolic-anabolic balance.

METHODS AND RESULTS:

Sixty CHF patients (30 patients aged ≤55 years, mean age 46±5 years; 30 patients aged ≥65 years, mean age 72±5 years) and 60 healthy controls (30 subjects aged ≤55 years, mean age 50±5 years; 30 subjects aged ≥65 years, mean age 72±4 years) were randomized to 4 weeks of supervised endurance training or to a control group. Before and after the intervention, vastus lateralis muscle biopsies were obtained. The expressions of cathepsin-L and the muscle-specific E3 ligases MuRF-1 and MAFbx were measured by real-time polymerase chain reaction and confirmed by Western blot. At baseline, MuRF-1 expression was significantly higher in CHF patients versus healthy controls (mRNA: 624±59 versus 401±25 relative units; P=0.007). After 4 weeks of exercise training, MuRF-1 mRNA expression was reduced by -32.8% (P=0.02) in CHF patients aged ≤55 years and by -37.0% (P<0.05) in CHF patients aged ≥65 years.

CONCLUSIONS:

MuRF-1, a component of the ubiquitin-proteasome system involved in muscle proteolysis, is increased in the skeletal muscle of patients with heart failure. Exercise training results in reduced MuRF-1 levels, suggesting that it blocks ubiquitin-proteasome system activation and does so in both younger and older CHF patients.