In:
Journal of Applied Physiology, American Physiological Society, Vol. 63, No. 4 ( 1987-10-01), p. 1428-1433
Abstract:
Theoretical consideration and experimental findings of 31P nuclear magnetic resonance spectroscopy (NMR) studies of exercising human muscle suggest that a graded, steady-state work protocol is highly suitable for performance evaluation in health and disease. We describe a similar rat model for repeated 31P-NMR studies that follows many of the 31P-NMR features observed in normal human controls. Calf muscles of rats anesthetized with chloral hydrate were indirectly stimulated at four frequencies (0.25, 0.5, 1.0, and 2.0 Hz). It was found that 1) several steady states can be briefly maintained in this model; 2) work-induced phosphocreatine (PCr) fall and inorganic phosphate (Pi) rise is stoichiometric; 3) a linear relationship between stimulation rate and Pi/PCr was obtained, with a slope of 2.01 +/- 0.4 (+/- 2SD, n = 15); 4) no significant drop in ATP was observed, allowing the estimation of phosphorylation potential (PP) changes during this range of muscle work (PP at rest was 61,603 +/- 25,100 M-1 and fell to 6,700 +/- 900 M-1 at the end of exercise); and 5) poststimulation recovery was rapid, with a rate of 2.27 +/- 0.5 PCr/Pi U/min. This simple model can be used for prolonged studies of chronic animal muscle disorders.
Type of Medium:
Online Resource
ISSN:
8750-7587
,
1522-1601
DOI:
10.1152/jappl.1987.63.4.1428
Language:
English
Publisher:
American Physiological Society
Publication Date:
1987
detail.hit.zdb_id:
219139-8
detail.hit.zdb_id:
1404365-8
SSG:
12
SSG:
31
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