High-energy phosphate metabolism in the calf muscle of healthy humans during incremental calf exercise with and without moderate cuff stenosis

2007 ◽  
Vol 99 (5) ◽  
pp. 519-531 ◽  
Author(s):  
Andreas Greiner ◽  
Regina Esterhammer ◽  
Dietmar Bammer ◽  
Hubert Messner ◽  
Christian Kremser ◽  
...  
Keyword(s):  
High Energy ◽  
Calf Muscle ◽  
Phosphate Metabolism ◽  
High Energy Phosphate ◽  
Healthy Humans ◽  
Calf Exercise ◽  
High Energy Phosphate Metabolism

Interleaved MRI/MRS study of muscle perfusion, oxygenation and high energy phosphate metabolism in normal subjects and Becker's myopathic patients

1998 ◽  
Vol 95 (2) ◽  
pp. 250-255
Author(s):  
J. F. Toussaint ◽  
C. Brillault-Salvat ◽  
E. Giacomini ◽  
G. Bloch ◽  
D. Duboc ◽  
...  
Keyword(s):  
Normal Subjects ◽  
High Energy ◽  
Phosphate Metabolism ◽  
High Energy Phosphate ◽  
Muscle Perfusion ◽  
High Energy Phosphate Metabolism

Differential energetic response of brain vs. skeletal muscle upon glycemic variations in healthy humans

2008 ◽  
Vol 294 (1) ◽  
pp. R12-R16 ◽  
Author(s):  
Kerstin M. Oltmanns ◽  
Uwe H. Melchert ◽  
Harald G. Scholand-Engler ◽  
Maria C. Howitz ◽  
Bernd Schultes ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Underlying Mechanism ◽  
High Energy ◽  
Resonance Spectroscopy ◽  
Energy Status ◽  
High Energy Phosphate ◽  
Available Energy ◽  
Healthy Humans ◽  
High Energy Phosphate Metabolism ◽  
The Brain

The brain regulates all metabolic processes within the organism, and therefore, its energy supply is preserved even during fasting. However, the underlying mechanism is unknown. Here, it is shown, using 31P-magnetic resonance spectroscopy that during short periods of hypoglycemia and hyperglycemia, the brain can rapidly increase its high-energy phosphate content, whereas there is no change in skeletal muscle. We investigated the key metabolites of high-energy phosphate metabolism as rapidly available energy stores by 31P MRS in brain and skeletal muscle of 17 healthy men. Measurements were performed at baseline and during dextrose or insulin-induced hyperglycemia and hypoglycemia. During hyperglycemia, phosphocreatine (PCr) concentrations increased significantly in the brain ( P = 0.013), while there was a similar trend in the hypopglycemic condition ( P = 0.055). Skeletal muscle content remained constant in both conditions ( P > 0.1). ANOVA analyses comparing changes from baseline to the respective glycemic plateau in brain (up to +15%) vs. muscle (up to −4%) revealed clear divergent effects in both conditions ( P < 0.05). These effects were reflected by PCr/Pi ratio ( P < 0.05). Total ATP concentrations revealed the observed divergency only during hyperglycemia ( P = 0.018). These data suggest that the brain, in contrast to peripheral organs, can activate some specific mechanisms to modulate its energy status during variations in glucose supply. A disturbance of these mechanisms may have far-reaching implications for metabolic dysregulation associated with obesity or diabetes mellitus.

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