Viscous properties of human muscle during contraction
scribed by the general law: ¹ "B d dt. "B Q ,. (8) where B is the damping coe$cient and t the time. Considering that Q is negative in plantar#exion, the combination ...
Viscous properties of human muscle during contraction A. Desplantez, C. Cornu, F. Goubel* DeH partement de GeH nie Biologique, UMR CNRS 6600, UniversiteH de Technologie, Compie` gne, France Received in "nal form 19 January 1999
Abstract The purpose of this study was to determine viscous properties of human muscle during plantar#exion e!orts. Experiments were performed on 17 subjects with an ankle ergometer allowing sinusoidal oscillations during isometric contractions and isokinetic movements. Sinusoidal oscillations led to the expression of (i) Bode diagrams of the musculo-articular system allowing the determination of a damping coe$cient (B ); and (ii) a viscous coe$cient (B ) using an adaptation of Hill's equation to sinusoidal oscillations. Isokinetic movements led to torque}velocity relationships. They showed a fall in torque associated to an increase in angular velocity what was quanti"ed by calculating a damping coe$cient (B ). Both experiments gave consistent results indicating that B was the lowest viscous parameter. This di!erence is discussed in terms of (i) &&analog'' viscosity originating from muscle cross-bridges; and (ii) real mechanical damping of passive structures. 1999 Elsevier Science Ltd. All rights reserved. Keywords: Ankle ergometer; Isokinetic; Sinusoidal perturbations; Viscosity; Human muscle
1. Introduction Since a resting skeletal muscle exhibits quite ordinary viscoelastic properties (Fung, 1993), the most interesting studies on muscle mechanics concern the contraction. When fully activated and allowed to shorten, muscle is unable to develop the same force as it can under isometric contraction (P ): contractile force (P) decreases as shortening velocity (
tension was zero) over the shortest 2.3±1.2·cm of their range. With combined ... its physiological range is much less than the total change in muscleâtendon unit ...
ing torque should be predictable on the basis of the knowledge of ... Some of the results have been reported ..... The left-hand column of Table 1 provides the.
Apr 19, 2002 - This article cites http://jap.physiology.org/cgi/content/full/93/2/469#BIBL. 2 other HighWire hosted articles: This article has been cited by. [PDF] ...... Med Sci Sports Exerc 27: 556â565, 1995. 8. Binder-Macleod SA and Russ DW ...
contractions determined by real-time ultrasonography. TETSUO FUKUNAGA, ... The tibialis anterior muscle (TA) was tested in five healthy men who performed ...
bipeds and quadrupeds contract while the limb is on the .... These values are very close ... ruled out. Our data indicate that the GM tendon acts as a spring.
system (CNS) motor drive or to failing neuromuscular transmission, but ... However, despite this conclusion, both the integrated electromyogram. (EMG) and the mean firing rate ..... nism limiting electrical propagation during fatigue at any site in .
lung volume increased with percentage of WË max as a result of an increase in Vrc,p ... shown that the chest wall moves with more than two degrees of .... intercepts of the RCp relaxation line are given in Table. 1. ..... On the basis of the above .
Dec 4, 2002 - frequencies (for periods of 15 s, 10 s or 5 s), first on the whole foot and then on the forefoot. The mean static energy consumption of all subjects ...
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We studied 6 normal control subjects (4 male, 2 female; ages. 22-56 years) ..... tive to that of the agonist [4, 6, 141 may also affect the rate of rise of tension and ...
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Sep 8, 1975 - volunteer subjects, male and female, with ages ranging from 20 to 35 yr. The subject lay prone with his left foot on the pedal carrying the strain.
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magnetic field gradients were obtained simultaneously at 61 recording sites. ... precentral motor cortex, then was quantified by first filtering the signals through ...
contracting muscle fibers grows, there would be progressive engagement of more tendon strands so that tendon stiffness would increase ... section beryllium.
thermore, in many explosive movements the skeletal system is mechanically .... of view, skeletal muscles are not ideal actuators: muscle force does not depend ...
6.3, and apply Newton's second law of motion. Where ..... Had water mixed with sawdust flow ..... In the course of this, the attack angles probably exceeded their.
near-infrared spectroscopy technique. Surface electromyograms (RMS) of both vastus lateralis and biceps femoris were also recorded. Furthermore, before and ...
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