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Updated: Jul 16, 2026

Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers

Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers

Published on: February 24, 2014

SparkMaster: automated calcium spark analysis with ImageJ.

Eckard Picht¹, Aleksey V Zima, Lothar A Blatter

¹Dept. of Physiology, Loyola Univ. Chicago, Stritch School of Medicine, 2160 South First Ave., Maywood, IL 60153, USA.

American Journal of Physiology. Cell Physiology

|March 23, 2007

Summary

We developed SparkMaster, an automated program for analyzing calcium (Ca) sparks in muscle cells. This tool provides rapid, reliable, and user-friendly analysis of Ca spark events, improving upon manual methods.

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Area of Science:

Cellular Physiology
Biophysics
Molecular Biology

Background:

Calcium (Ca) sparks are fundamental Ca-release events crucial in muscle cell function.
Current manual analysis of Ca spark images is laborious, error-prone, and subject to bias.
Confocal laser-scanning microscopy in line-scan mode is the standard for Ca spark imaging.

Purpose of the Study:

To develop an automated software tool, SparkMaster, for rapid and reliable Ca spark analysis.
To provide a user-friendly interface for selecting analysis parameters and output options.
To validate the accuracy and efficiency of SparkMaster across diverse experimental conditions.

Main Methods:

Developed SparkMaster, an automated analysis program implemented in ImageJ.

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Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers

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Adapted a threshold-based algorithm from Cheng et al. (1999) for spark detection.

Validated using synthetic sparks with varying signal-to-noise ratios and applied to experimental muscle cell data.

Main Results:

SparkMaster automates the analysis of general (e.g., frequency) and individual spark parameters (e.g., amplitude, duration).
Validation confirmed high sensitivity and low false-positive detection rates.
Successful application to Ca spark analysis in ventricular cardiomyocytes, skeletal muscle, and smooth muscle cells.

Conclusions:

SparkMaster offers a reliable, efficient, and easy-to-use solution for Ca spark quantification.
The software facilitates high-throughput analysis of Ca sparks in various muscle types.
Automated analysis significantly reduces time and potential bias associated with manual methods.