The Variation of Isometric Energy Rates With Muscle Length: A Distribution-Moment Model AnalysisSource: Journal of Biomechanical Engineering:;1992:;volume( 114 ):;issue: 004::page 542DOI: 10.1115/1.2894109Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The Distribution-Moment Model of skeletal muscle, which has been enhanced recently to make possible the calculation of chemical energy release (Ė) and heat production (Ḣ) rates [1], is applied to isometric muscle. Under steady-state isometric conditions the model predicts a simple relation between the energy rates and the muscle length, namely (Ė/Ėmax) = (Ḣ/Ḣmax) = [1 + Bα(Λ)]/[1 + B], where Λ is the ratio of muscle length to the “optimal” length at which maximal isometric tension is produced, and α(Λ) is a function numerically equal to the ratio of the tetanic isometric force to its maximum value. The single dimensionless constant in this relation, B, can be calculated from model parameters characterizing muscle dynamics at the optimum length, and has a value near unity for frog sartorius at 0°C. The predicted behavior is shown to agree reasonably well with experimental measurements of heat production and phosphocreatine (PCr) hydrolysis. The model relates the isometric energy rates to PCr hydrolysis in (1) cross-bridge interactions, and (2) calcium pumping into the sarcoplasmic reticulum.
keyword(s): Muscle , Heat , Measurement , Chemical energy , Dynamics (Mechanics) , Force , Steady state AND Tension ,
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contributor author | E. Rouhaud | |
contributor author | G. I. Zahalak | |
date accessioned | 2017-05-08T23:37:40Z | |
date available | 2017-05-08T23:37:40Z | |
date copyright | November, 1992 | |
date issued | 1992 | |
identifier issn | 0148-0731 | |
identifier other | JBENDY-25891#542_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/109825 | |
description abstract | The Distribution-Moment Model of skeletal muscle, which has been enhanced recently to make possible the calculation of chemical energy release (Ė) and heat production (Ḣ) rates [1], is applied to isometric muscle. Under steady-state isometric conditions the model predicts a simple relation between the energy rates and the muscle length, namely (Ė/Ėmax) = (Ḣ/Ḣmax) = [1 + Bα(Λ)]/[1 + B], where Λ is the ratio of muscle length to the “optimal” length at which maximal isometric tension is produced, and α(Λ) is a function numerically equal to the ratio of the tetanic isometric force to its maximum value. The single dimensionless constant in this relation, B, can be calculated from model parameters characterizing muscle dynamics at the optimum length, and has a value near unity for frog sartorius at 0°C. The predicted behavior is shown to agree reasonably well with experimental measurements of heat production and phosphocreatine (PCr) hydrolysis. The model relates the isometric energy rates to PCr hydrolysis in (1) cross-bridge interactions, and (2) calcium pumping into the sarcoplasmic reticulum. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | The Variation of Isometric Energy Rates With Muscle Length: A Distribution-Moment Model Analysis | |
type | Journal Paper | |
journal volume | 114 | |
journal issue | 4 | |
journal title | Journal of Biomechanical Engineering | |
identifier doi | 10.1115/1.2894109 | |
journal fristpage | 542 | |
journal lastpage | 546 | |
identifier eissn | 1528-8951 | |
keywords | Muscle | |
keywords | Heat | |
keywords | Measurement | |
keywords | Chemical energy | |
keywords | Dynamics (Mechanics) | |
keywords | Force | |
keywords | Steady state AND Tension | |
tree | Journal of Biomechanical Engineering:;1992:;volume( 114 ):;issue: 004 | |
contenttype | Fulltext |