Key result
No single characteristic is diagnostic of muscle fibers recruited for sustained force production in vertebrates, though aerobic metabolism always accounts for a significant proportion of ATP turnover.
Highlights the diversity and lack of a single diagnostic characteristic for vertebrate muscle fibers specialized for sustained force production.
No single trait diagnoses sustained-force fibers; leaves open composite criteria for vertebrate muscle studies.
The kinds of muscle fibre that are recruited for sustained force production by different vertebrates are described. Although aerobic metabolism always accounts for a significant proportion of their ATP turnover, no single characteristic such as colour, number and form of motor endplates, membrane properties, myosin isotype or contraction speed is diagnostic of such muscles. As mechanical power output increases, there is a tendency for a decrease in fatigue resistance with repetitive usage and an increase in both aerobic capacity and the fraction of energy requirements derived from glycolysis.
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Ian A. Johnston (1985) reported a review. No single characteristic is diagnostic of muscle fibers recruited for sustained force production in vertebrates, though aerobic metabolism always accounts for a significant proportion of ATP turnover.
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