31P MRS studies of exercising human muscle at high temporal resolution.
Methods for measuring mitochondrial activity from 31P magnetic resonance spectroscopy data collected during and after exercise were compared in controls, weight lifters, and peripheral vascular occlusive disease (PVOD) patients. There were trends toward increasing mitochondrial activity during exercise in order from PVOD patients, moderately active controls, highly active controls, to weight lifters. Results from PVOD patients show divergence of some measures due to 1) the non-exponential nature of phosphocreatine recovery, and 2) potential breakdown of [ADP] control of the mitochondria due to lack of oxygen (for Qmax calculation). These results demonstrate the utility of obtaining and directly analyzing high time resolution data rather than assuming monoexponential behavior of metabolite recovery.
Boska
M D
MD
Department of Neurology, Henry Ford Hospital, Detroit, Michigan, USA.
Nelson
J A
JA
Sripathi
N
N
Pipinos
I I
II
Shepard
A D
AD
Welch
K M
KM
D000244:Adenosine Diphosphate / Q000096:biosynthesis; D000255:Adenosine Triphosphate / Q000096:biosynthesis; D016022:Case-Control Studies; D004734:Energy Metabolism; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008931:Mitochondria, Muscle / Q000378:metabolism; D018482:Muscle, Skeletal / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D016491:Peripheral Vascular Diseases / Q000378:metabolism; D010725:Phosphocreatine / Q000096:biosynthesis; D014891:Weight Lifting
D010725:Phosphocreatine; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate