In vivo determination of the compliance of the passive series elastic component of the human quadriceps femoris muscle

1991 ◽  
Vol 24 (6) ◽  
pp. 453
Author(s):  
M. Voigt
2009 ◽  
Vol 106 (6) ◽  
pp. 827-838 ◽  
Author(s):  
Robert M. Erskine ◽  
David A. Jones ◽  
Constantinos N. Maganaris ◽  
Hans Degens

1992 ◽  
Vol 72 (8) ◽  
pp. 585-592 ◽  
Author(s):  
Leslie Afzali ◽  
Fumi Kuwabara ◽  
James Zachazewski ◽  
Phyllis Browne ◽  
Bonnie Robinson

2003 ◽  
Vol 95 (3) ◽  
pp. 1090-1096 ◽  
Author(s):  
Neil D. Reeves ◽  
Marco V. Narici

The aim of the present study was to investigate the behavior of human muscle fascicles during dynamic contractions. Eight subjects performed maximal isometric dorsiflexion contractions at six ankle joint angles and maximal isokinetic concentric and eccentric contractions at five angular velocities. Tibialis anterior muscle architecture was measured in vivo by use of B-mode ultrasonography. During maximal isometric contraction, fascicle length was shorter and pennation angle larger compared with values at rest ( P < 0.01). During isokinetic concentric contractions from 0 to 4.36 rad/s, fascicle length measured at a constant ankle joint angle increased curvilinearly from 49.5 to 69.7 mm (41%; P < 0.01), whereas pennation angle decreased curvilinearly from 14.8 to 9.8° (34%; P < 0.01). During eccentric muscle actions, fascicles contracted quasi-isometrically, independent of angular velocity. The behavior of muscle fascicles during shortening contractions was believed to reflect the degree of stretch applied to the series elastic component, which decreases with increasing contraction velocity. The quasi-isometric behavior of fascicles during eccentric muscle actions suggests that the series elastic component acts as a mechanical buffer during active lengthening.


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