Journal
EUROPEAN RESPIRATORY JOURNAL
Volume 40, Issue 5, Pages 1130-1136Publisher
EUROPEAN RESPIRATORY SOC JOURNALS LTD
DOI: 10.1183/09031936.00193411
Keywords
Exercise; knee extensor; limb; lung; mitochondria; oxygen uptake
Categories
Funding
- National Heart and Lung Foundation
- Norwegian Lung Medicine Society
- Samarbeidsorganet NTNU
- St Olavs Hopsital
- K.G. Jebsen Foundation
- Norwegian Research Council
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Improving reduced skeletal muscle function is important for optimising exercise tolerance and quality of life in chronic obstructive pulmonary disease (COPD) patients. By applying high-intensity training to a small muscle group, we hypothesised a normalisation of muscle function. Seven patients with COPD performed 6 weeks (3 days.week(-1)) of high-intensity interval aerobic knee extensor exercise training. Five age-matched healthy individuals served as a reference group. Muscle oxygen uptake and mitochondrial respiration of the vastus lateralis muscle were measured before and after the 6-week training programme. Initial peak work and maximal mitochondrial respiration were reduced in COPD patients and improved significantly after the training programme. Peak power and maximal mitochondrial respiration in vastus lateralis muscle increased to the level of the control subjects and were mainly mediated via improved complex I respiration. Furthermore, when normalised to citrate synthase activity, no difference in maximal respiration was found either after the intervention or compared to controls, suggesting normal functioning mitochondrial complexes. The present study shows that high-intensity training of a restricted muscle group is highly effective in restoring skeletal muscle function in COPD patients.
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