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J Magn Reson Imaging. 2011 Nov;34(5):1143-50. doi: 10.1002/jmri.22733.

Measurement of human skeletal muscle oxidative capacity by 31P-MR spectroscopy: a cross-validation with in vitro measurements.

Author information

1
Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.

Abstract

PURPOSE:

To cross-validate skeletal muscle oxidative capacity measured by (31)P-MR spectroscopy with in vitro measurements of oxidative capacity in mitochondria isolated from muscle biopsies of the same muscle group in 18 healthy adults.

MATERIALS AND METHODS:

Oxidative capacity in vivo was determined from PCr recovery kinetics following a 30-s maximal isometric knee extension. State 3 respiration was measured in isolated mitochondria using high-resolution respirometry. A second cohort of 10 individuals underwent two (31)P-MRS testing sessions to assess the test-retest reproducibility of the method.

RESULTS:

Overall, the in vivo and in vitro methods were well-correlated (r = 0.66-0.72) and showed good agreement by Bland Altman plots. Excellent reproducibility was observed for the PCr recovery rate constant (CV = 4.6%; ICC = 0.85) and calculated oxidative capacity (CV = 3.4%; ICC = 0.83).

CONCLUSION:

These results indicate that (31)P-MRS corresponds well with gold-standard in vitro measurements and is highly reproducible.

PMID:
22006551
PMCID:
PMC3201762
DOI:
10.1002/jmri.22733
[Indexed for MEDLINE]
Free PMC Article

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