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Sarcoplasmic reticulum ATPase activity in type I and II skeletal muscle fibres of chronic heart failure patients.

Abstract：

BACKGROUND:Reduced exercise tolerance and muscle weakness are present in patients with CHF. Altered metabolism, histology and function in skeletal muscle of patients with CHF have been reported. The sarcoplasmic reticulum (SR) has control of Ca(++) release and uptake required for contraction and relaxation, respectively, and uses a considerable amount of energy. Little is known about SR alterations in CHF. We determined sarcoplasmic reticulum adenosine triphosphatase (SR ATPase) activity in different types of skeletal muscle fibres of CHF patients. METHODS:SR ATPase activity, succinate dehydrogenase (SDH) activity and myofibrillar adenosine triphosphatase (M ATPase) activity in single fibres of the vastus lateralis muscle in 16 CHF patients and 5 controls was determined using quantitative enzyme histochemistry. RESULTS:SR ATPase activity of type II skeletal muscle fibers was significantly higher compared to type I fibres. SR ATPase activity in type II skeletal muscle fibres of CHF patients was higher than in control subjects. CONCLUSION:Increased skeletal muscle SR ATPase activity contributes to reduced exercise tolerance in CHF patients.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Bekedam MA,van Beek-Harmsen BJ,van Mechelen W,Boonstra A,Visser FC,van der Laarse WJ

doi

10.1016/j.ijcard.2007.12.025

subject

Has Abstract

pub_date

2009-04-03 00:00:00

pages

185-90

issue

2

eissn

0167-5273

issn

1874-1754

pii

S0167-5273(08)00007-7

journal_volume

133

pub_type

杂志文章

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