Residual force enhancement following shortening is speed-dependent

Sci Rep. 2016 Feb 12:5:21513. doi: 10.1038/srep21513.

Abstract

The steady-state isometric force following active muscle shortening or lengthening is smaller (force depression; FD) or greater (residual force enhancement; RFE) than a purely isometric contraction at the corresponding length. The mechanisms underlying these phenomena are not explained within the context of the cross-bridge theory and are rarely studied in concert. Previous studies have shown RFE to be speed-independent. In the present study, we investigated if RFE preceded by active shortening is time-dependent by electrically evoking RFE in the human adductor pollicis muscle. The results shown that a slow stretch following FD fully re-established RFE compared to higher speeds of stretch. The mechanism(s) responsible for the recovery of RFE following a preceding shortening contraction (FD) might be associated with the recovery of cross-bridge based force and/or the re-engagement of a passive structural element (titin). Voluntary interaction with one's environment involves highly coordinated shortening and lengthening muscle contractions. Therefore comprehending these history-dependent muscle properties in the context of movement control is paramount in understanding the behavior of in vivo motor control.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Electric Stimulation
  • Healthy Volunteers
  • Humans
  • Male
  • Mechanical Phenomena*
  • Muscle Contraction*
  • Muscle, Skeletal / physiology*
  • Young Adult