Creed Stary

Publication Details

  • Resistance to fatigue of individual Xenopus single skeletal muscle fibres is correlated with mitochondrial volume density EXPERIMENTAL PHYSIOLOGY Stary, C. M., Mathieu-Costello, O., Hogan, M. C. 2004; 89 (5): 617-621

    Abstract:

    The purpose of the present study was to compare the individual fatigue characteristics of isolated single skeletal muscle fibres with their mitochondrial volume density (MVD), using direct histological morphometry. Single muscle fibres (n= 14) were microdissected from lumbrical muscle of adult female Xenopus laevis, and force was measured while fibres were stimulated (tetanic contractions of 200 ms trains with 70 Hz stimuli at 9 V) at progressively increasing frequencies (2 min each at 0.25, 0.33, 0.5 and 1 contractions s(-1)) until fatigue (<50% initial maximal force) had been established. Following the end of the fatigue protocol, MVD was determined by electron microscopy. Time to fatigue varied among the individual fibres from 3.3 to 10 min. MVD of individual fibres ranged from 3.0 to 9.2% and was positively correlated (r= 0.93) with time to fatigue of corresponding fibres. These results, using direct histological measurements of MVD: (1) support on a single cell basis the notion that oxidative capacity is a major determinant of muscle fatigue resistance; and (2) show that the fatigue profile of a single cell can be used to predict oxidative capacity.

    View details for DOI 10.1113/expphysiol.2004.027763

    View details for Web of Science ID 000223470200012

    View details for PubMedID 15258122

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