The Frank-Starling curve is a length-tension curve.

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The Frank-Starling curve describes the relationship between cardiac output and end-diastolic volume (preload) during ventricular contraction. It is not directly related to a length-tension curve, which describes the relationship between muscle length and tension or force generation. However, the Frank-Starling mechanism does involve changes in muscle length and sarcomere stretch, as increased preload causes an increase in sarcomere length and force generation through increased cross-bridge formation. So there is some overlap and interaction between the concepts, but they are not identical.

The Frank-Starling Curve Is a Length-Tension Curve