Minimal shortening in a high-frequency muscle

Brad R. Moon, Kevin E. Conley, Stan L Lindstedt, Michael R. Urquhart

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Reducing the cost of high-frequency muscle contractions can be accomplished by minimizing cross-bridge cycling or by recycling elastic strain energy. Energy saving by contractile minimization has very different implications for muscle strain and activation patterns than by elastic recoil. Minimal cross-bridge cycling will be reflected in minimal contractile strains and highly reduced force, work and power output, whereas elastic energy storage requires a period of active lengthening that increases mechanical output. In this study, we used sonomicrometry and electromyography to test the relative contributions of energy reduction and energy recycling strategies in the tailshaker muscles of western diamondback rattlesnakes (Crotalus atrox). We found that tailshaker muscle contractions produce a mean strain of 3%, which is among the lowest strains ever recorded in vertebrate muscle during movement. The relative shortening velocities (V/Vmax) of 0.2-0.3 were in the optimal range for maximum power generation, indicating that the low power output reported previously for tailshaker muscle is due mainly to contractile minimization rather than to suboptimal V/Vmax. In addition, the brief contractions (8-18 ms) had only limited periods of active lengthening (0.2-0.5 ms and 0.002-0.035%), indicating little potential for elastic energy storage and recoil. These features indicate that high-frequency muscles primarily reduce metabolic energy input rather than recycle mechanical energy output.

Original languageEnglish (US)
Pages (from-to)1291-1297
Number of pages7
JournalJournal of Experimental Biology
Volume206
Issue number8
DOIs
StatePublished - Apr 2003

Fingerprint

shortenings
muscle
Muscles
muscles
energy
Crotalus
Recycling
Muscle Contraction
contraction
Crotalus atrox
muscle contraction
recycling
Electromyography
Vertebrates
power generation
electromyography
labor force
Costs and Cost Analysis
vertebrate
storage time

Keywords

  • Biomechanics
  • Cross-bridge
  • Crotalus atrox
  • Elastic recoil
  • Muscle contraction
  • Rattlesnake
  • Tailshaker muscle

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Agricultural and Biological Sciences (miscellaneous)

Cite this

Minimal shortening in a high-frequency muscle. / Moon, Brad R.; Conley, Kevin E.; Lindstedt, Stan L; Urquhart, Michael R.

In: Journal of Experimental Biology, Vol. 206, No. 8, 04.2003, p. 1291-1297.

Research output: Contribution to journalArticle

Moon, Brad R. ; Conley, Kevin E. ; Lindstedt, Stan L ; Urquhart, Michael R. / Minimal shortening in a high-frequency muscle. In: Journal of Experimental Biology. 2003 ; Vol. 206, No. 8. pp. 1291-1297.
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