What question did this study set out to answer?

This research aims to explore how calcium concentration affects the force-velocity-length relationships of cat heart muscle.

March 1, 1973Circulation Research

Effect of Calcium on Force-Velocity-Length Relations of Heart Muscle of the Cat

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Why the study?

Does increasing calcium concentration alter the force-velocity relations in isolated cat papillary muscle?

Population

Isolated, electrically excited cat papillary muscle

Comparison

Increasing calcium concentration in the bathing… vs Baseline/lower calcium concentration

Design

Preclinical

Authors

DBDirk L. BrutsaertHeart Failure & Transplant VCVictor ClaesUniversity of Antwerp MGM A GoethalsUniversity of Antwerp

Discussion

Member takes

Implication

Hypothesis-generating in isolated feline myocardium; leaves open translation to human cardiac function or therapy.

Key Points

This research aims to explore how calcium concentration affects the force-velocity-length relationships of cat heart muscle.
Isolated cat papillary muscle was electrically excited and subjected to varying calcium concentrations.
Shortening velocity was directly measured through unloading and load clamping techniques.
Measurements were made over a physiological length range from maximum active tension to reduced loads.
Increasing calcium concentration enhanced the maximum unloaded shortening velocity.
The normalized force-velocity relationship shifted when comparing force as a fraction of total tension.
Findings imply a complex role of calcium beyond simple binding to troponin.

Structured PICO

Does increasing calcium concentration alter the force-velocity relations in isolated cat papillary muscle?

Population

Isolated, electrically excited cat papillary muscle

Intervention

Increasing calcium concentration in the bathing solution

Comparator

Baseline/lower calcium concentration

Outcome

Force-velocity relations (shortening velocity measured at minimum loads)surrogate

Increasing calcium concentration augments maximum unloaded shortening velocity in cat papillary muscle, suggesting calcium's action extends beyond simple troponin binding.

Cite This Study

Brutsaert et al. (1973) studied this question.

synapsesocial.com/papers/6a2311fbdcf11962cd16e6b3 https://doi.org/10.1161/01.res.32.3.385

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Effect of Calcium on Force-Velocity-Length Relations of Heart Muscle of the Cat

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Effect of Calcium on Force-Velocity-Length Relations of Heart Muscle of the Cat

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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