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Blunted muscle angiogenic training-response in COPD patients versus sedentary controls

Abstract : The impaired skeletal muscle of chronic obstructive pulmonary disease (COPD) patients reduces exercise capacity. Similar to the oxidative muscle fibres, the angio-adaptation of muscle to training may be blunted in these patients, as in other chronic conditions. We therefore compared muscle functional responses and angio-adaptations after training in COPD patients and sedentary healthy subjects (SHS). 24 COPD patients (forced expiratory volume in 1 s 45.6 ± 17.5% predicted) and 23 SHS (<150 min · week(-1) of moderate-to-vigorous exercise) completed a 6-week rehabilitation programme based on individualised moderate-intensity endurance training. Histomorphological muscle analysis and measurements of pro-angiogenic vascular endothelial growth factor (VEGF)-A and anti-angiogenic thrombospondin (TSP)-1 were conducted before and after training. COPD patients and SHS showed improved symptom-limited oxygen consumption and muscle endurance, although improvements were lower in COPD patients (+0.96 ± 2.4 versus +2.9 ± 2.6 mL · kg(-1) · min(-1), p<0.05, and +65% versus +108%, p = 0.06, respectively). The capillary-to-fibre (C/F) ratio increased less in COPD patients than SHS (+16 ± 10% versus +37 ± 20%, p<0.05) and no fibre type switch occurred in COPD patients. The VEGF-A/TSP-1 ratio increased in COPD patients and SHS (+65% versus +35%, p<0.05). Changes in C/F and symptom-limited oxygen consumption were correlated (r = 0.51, p<0.05). In addition to a lack of fibre switch, COPD patients displayed a blunted angiogenic response to training.
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Submitted on : Wednesday, August 15, 2018 - 2:49:52 PM
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Fares Gouzi, Christian Prefaut, Aldjia Abdellaoui, Emilie Roudier, Philippe de Rigal, et al.. Blunted muscle angiogenic training-response in COPD patients versus sedentary controls. European Respiratory Journal, European Respiratory Society, 2013, 41 (4), pp.806-814. ⟨10.1183/09031936.00053512⟩. ⟨hal-01624893⟩

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