What question did this study set out to answer?

To characterize the dynamic force-velocity relationship of crab scaphognathite levator muscle during active lengthening under full and partial activation levels.

March 1, 1999Journal of Experimental Biology

The force–velocity properties of a crustacean muscle during lengthening

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To characterize the dynamic force-velocity relationship of crab scaphognathite levator muscle during active lengthening under full and partial activation levels.
Tested isolated scaphognathite levator muscle L2B from Carcinus maenas at 15°C under tetanic stimulation across 20 Hz, 50 Hz, and optimal 100 Hz frequencies.
Applied constant-velocity stretches during peak contraction across strain rates ranging from 0.03 to 1.6 muscle lengths per second (L s⁻¹) to approximately 4% total strain.
Stretch at low velocities (≤0.3 L s⁻¹) induced an exponential force increase toward an asymptotic limit, whereas stretches at ≥0.6 L s⁻¹ induced a distinct yield point at approximately 1% strain, reducing post-yield slope to approximately one-quarter of the pre-yield slope.
Partially activated muscles did not scale proportionally to fully activated muscles; they exhibited relatively higher asymptotic forces at low velocities and higher relative yield forces at high velocities.

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Implication

Physiological study demonstrates nonlinear force increases during active muscle lengthening in crabs, indicating force-velocity relationships require three-dimensional modeling.

Cite This Study

Josephson et al. (1999) studied this question.

synapsesocial.com/papers/6a7079a726a7f98052dcf995 https://doi.org/10.1242/jeb.202.5.593

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Implication

Physiological study demonstrates nonlinear force increases during active muscle lengthening in crabs, indicating force-velocity relationships require three-dimensional modeling.

The force–velocity properties of a crustacean muscle during lengthening

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Discussion

Implication

Cite This Study

The force–velocity properties of a crustacean muscle during lengthening

Key Points

Discussion

Implication

Cite This Study

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