Key result
Active shortening of rabbit psoas muscle fibres at 1.2 L0 s-1 resulted in a mean ATP utilisation rate of 1.7 mM s-1, about 9 times the isometric rate.
Population
Single skinned fibres from rabbit psoas muscle
Comparison
Active shortening vs Steady isometric contraction
Design
Preclinical
Authors
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Highlights ATP economy during rapid shortening in skeletal muscle models; leaves open relevance to human cardiac energetics.
The study demonstrates that the rate of ATP utilization during unloaded shortening in rabbit psoas muscle fibers is about 9 times the isometric rate, providing insights into mechanical-chemical coupling.
Sun et al. (2001) studied Rabbit psoas muscle fibres. Active shortening vs. Isometric contraction was evaluated on Rate of ATP utilisation. Active shortening of rabbit psoas muscle fibres at 1.2 L0 s-1 resulted in a mean ATP utilisation rate of 1.7 mM s-1, about 9 times the isometric rate.
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