Residual force depression is affected by muscle length.

ABSTRACT: The isometric force attained after active shortening is smaller than that attained during purely isometric contractions, although the sarcomere length and activation level are the same. This phenomenon is known as residual force depression. This study aimed to examine whether the magnitude of residual force depression is affected by muscle length. Single-skinned fibers obtained from the rabbit psoas muscle (n = 8) were used in this study. We measured the isometric forces at an average sarcomere length of 2.1, 2.4, and 2.7 μm, and the isometric forces attained after active shortening (from 2.7 to 2.4 μm, and from 2.4 to 2.1 μm) to calculate the magnitude of residual force depression attained at both long (2.4 μm) and short (2.1 μm) length conditions. The magnitude of residual force depressi

SUBMITTER: Fukutani A 

PROVIDER: S-EPMC11840086 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature