Carnosine and taurine contents in individual fibres of human vastus lateralis muscle
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1998
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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VASTUS-LATERALIS; MUSCLE; MAN; HYDROGEN-ION-CONCENTRATION; PEPTIDE
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-594
(Last edited on
2002/02/27 18:44:59 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Analysis of ATPase characterized type I and type II fibres from biopsy samples of the vastus lateralis muscle of four male subjects showed a selective distribution of carnosine and free taurine similar to that observed in other species. The mean carnosine concentration was twice as high in type II compared with type I muscle fibres (23.2 plus/minus 17.8 and 10.5 plus/minus 7.6 mmol.kg-1 dry weight, respectively), while taurine was four times higher in type I compared with type II muscle fibres (39.2 plus/minus 17.8 and 9.6 plus/minus 2.6 mmol.kg-1 dw, respectively). Overlap in the concentration of carnosine or taurine between fibre types occurred only once in one subject. There was no overlap between fibre types in the ratio of carnosine to taurine. Higher carnosine concentrations in type II fibres will result in a greater contribution to the buffering of H plus arising from anaerobic metabolism. The contribution in a type II fibre with the highest carnosine content was estimated to equal 28 percent of that from other sources.
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