Title of article :
Skeletal muscle response to short endurance training in heart transplant recipients
Author/Authors :
ELIANE LAMPERT، نويسنده , , BERTRAND METTAUER، نويسنده , , Hans Hoppeler، نويسنده , , ANNE CHARLOUX، نويسنده , , ARNAUD CHARPENTIER، نويسنده , , JEAN LONSDORFER، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1998
Pages :
7
From page :
420
To page :
426
Abstract :
Objectives. We sought to examine the effects of endurance training on the ultrastructural characteristics of skeletal muscle in heart transplant recipients (HTRs) and age-matched control subjects (C). Background. Deconditioning is one of the factors involved in the peripheral limitation of exercise capacity of HTRs, and training has proven to be beneficial. Methods. Biopsies of the vastus lateralis muscle, analyzed by ultrastructural morphometry, and quadriceps muscle cross-sectional area, assessed by computed tomography (CT), were performed in 12 HTRs and 7 age-matched C before and 6 weeks after an endurance training program. Maximal oxygen uptake (peak V̇O2) was determined by an incremental exercise test. Additionally muscle biopsies were performed before and after 6-week control period in four HTRs to check for spontaneous improvement. Results. Training resulted in similar increases in peak V̇O2 (11% in HTRs, 8.5% in C), ventilatory threshold (23% in HTRs, 32% in C) and total endurance work (54% in HTRs, 31% in C). Volume density of total mitochondri increased significantly (26% in HTRs, 33% in C) with predominant increase of subsarcolemmal mitochondrial volume density (74% in HTRs, 70% in C). The capillary/fiber ratio increased by 19% in C only. In the nontrained group, none of the structural markers was spontaneously modified. Conclusions. Six weeks of endurance training in HTRs and C led to similar improvements of aerobic work capacity. However, the decreased muscular capillary network in HTRs remained unchanged with training. Immunosuppressive therapy might be responsible for the discrepancy between the normal mitochondrial content and the reduced capillary supply of these patients.
Keywords :
vascular endothelial growth factor , VEGF , transforming growth factor-beta , computed tomography , CT , Oxygen uptake , c , TGF-? , V?o2 , age-matched control subjects , HTRs , heart transplant recipients
Journal title :
JACC (Journal of the American College of Cardiology)
Serial Year :
1998
Journal title :
JACC (Journal of the American College of Cardiology)
Record number :
480778
Link To Document :
بازگشت