The effect of shortening history on isometric and dynamic muscle function.

Journal of Biomechanics
John McDanielJames C Martin

Abstract

Despite numerous reports on isometric force depression, few reports have quantified force depression during active muscle shortening (dynamic force depression). The purpose of this investigation was to determine the influence of shortening history on isometric force following active shortening, force during isokinetic shortening, and velocity during isotonic shortening. The soleus muscles of four cats were subjected to a series of isokinetic contractions at three shortening velocities and isotonic contractions under three loads. Muscle excursions initiated from three different muscle lengths but terminated at a constant length. Isometric force produced subsequent to active shortening, and force or shortening velocity produced at a specific muscle length during shortening, were compared across all three conditions. Results indicated that shortening history altered isometric force by up to 5%, force during isokinetic shortening up to 30% and shortening velocity during isotonic contractions by up to 63%. Furthermore, there was a load by excursion interaction during isotonic contractions such that excursion had the most influence on shortening velocity when the loads were the greatest. There was not a velocity by excursion interact...Continue Reading

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Citations

May 14, 2014·European Journal of Applied Physiology·Daniel HahnAnsgar Schwirtz
May 20, 2014·Experimental Gerontology·Geoffrey A PowerAnthony A Vandervoort
Feb 4, 2014·Journal of Biomechanics·Olaf TillReinhard Blickhan
May 19, 2018·The Journal of Experimental Biology·James C Martin, Jennifer A Nichols
Jan 18, 2019·Journal of Applied Physiology·Jackey ChenGeoffrey A Power
Feb 23, 2013·Journal of Applied Physiology·Walter Herzog

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