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Bioenergetics and intermuscular fat in chronic obstructive pulmonary disease‐associated quadriceps weakness
Author(s) -
Shields Gregory Samuel,
Coissi Graziele S.,
JimenezRoyo Pilar,
Gambarota Giulio,
Dimber Rahul,
Hopkinson Nicholas S.,
Matthews Paul M.,
Brown Andrew P.,
Polkey Michael I.
Publication year - 2015
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24289
Subject(s) - biceps , medicine , copd , phosphocreatine , magnetic resonance imaging , cardiology , pulmonary disease , surgery , energy metabolism , radiology
: Chronic obstructive pulmonary disease (COPD) is associated with metabolic abnormalities in muscles of the lower limbs, but it is not known whether these abnormalities are generalized or limited to specific muscle groups, nor is there an easy way of predicting their presence. Methods : Metabolism in the quadriceps and biceps of 14 COPD patients and controls was assessed during sustained contraction using 31‐phosphorus magnetic resonance spectroscopy ( 31 P MRS). T1 MRI was used to measure quadriceps intermuscular adipose tissue (IMAT). Results : COPD patients had prolonged quadriceps phosphocreatine time (patients: 38.8 ± 12.7 s; controls: 25.2 ± 10.6 s; P = 0.006) and a lower pH (patents: 6.88 ± 0.1; controls: 6.99 ± 0.06; P = 0.002). Biceps measures were not significantly different. IMAT was associated with a nadir pH <7.0 (area under the curve = 0.84). Conclusions : Anaerobic metabolism during contraction was characteristic of quadriceps, but not biceps, muscles of patients with COPD and was associated with increased IMAT. Because IMAT can be assessed quickly by conventional MRI, it may be a useful approach for identifying patients with abnormal muscle bioenergetics. Muscle Nerve 51 : 214–221, 2015