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Interrelation of 31 P‐MRS metabolism measurements in resting and exercised quadriceps muscle of overweight‐to‐obese sedentary individuals
Author(s) -
Valkovič Ladislav,
Ukropcová Barbara,
Chmelík Marek,
Baláž Miroslav,
Bogner Wolfgang,
Schmid Albrecht Ingo,
Frollo Ivan,
Zemková Erika,
Klimeš Iwar,
Ukropec Jozef,
Trattnig Siegfried,
Krššák Martin
Publication year - 2013
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.3008
Subject(s) - phosphocreatine , skeletal muscle , population , medicine , endocrinology , metabolism , chemistry , energy metabolism , nuclear magnetic resonance , physics , environmental health
Phosphorus magnetic resonance spectroscopy ( 31 P‐MRS) enables the non‐invasive evaluation of muscle metabolism. Resting Pi‐to‐ATP flux can be assessed through magnetization transfer (MT) techniques, and maximal oxidative flux ( Q max ) can be calculated by monitoring of phosphocreatine (PCr) recovery after exercise. In this study, the muscle metabolism parameters of 13 overweight‐to‐obese sedentary individuals were measured with both MT and dynamic PCr recovery measurements, and the interrelation between these measurements was investigated. In the dynamic experiments, knee extensions were performed at a workload of 30% of maximal voluntary capacity, and the consecutive PCr recovery was measured in a quadriceps muscle with a time resolution of 2 s with non‐localized 31 P‐MRS at 3 T. Resting skeletal muscle metabolism was assessed through MT measurements of the same muscle group at 7 T. Significant linear correlations between the Q max and the MT parameters k ATP ( r = 0.77, P = 0.002) and F ATP ( r = 0.62, P = 0.023) were found in the study population. This would imply that the MT technique can possibly be used as an alternative method to assess muscle metabolism when necessary (e.g. in individuals after stroke or in uncooperative patients). Copyright © 2013 John Wiley & Sons, Ltd.