scholarly journals Force enhancement in single skeletal muscle fibres on the ascending limb of the force-length relationship

2004 ◽  
Vol 207 (16) ◽  
pp. 2787-2791 ◽  
Author(s):  
D. R. Peterson
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibres ◽  
Force Enhancement ◽  
Length Relationship ◽  
Skeletal Muscle Fibres

scholarly journals Modulation of passive force in single skeletal muscle fibres

2005 ◽  
Vol 1 (3) ◽  
pp. 342-345 ◽  
Author(s):  
Dilson E Rassier ◽  
Eun-Jeong Lee ◽  
Walter Herzog
Keyword(s):  
Skeletal Muscle ◽  
Sarcomere Length ◽  
Fibre Length ◽  
Muscle Fibres ◽  
Isometric Contractions ◽  
Passive Force ◽  
Length Relationship ◽  
Lumbrical Muscle ◽  
Single Fibres ◽  
Skeletal Muscle Fibres

In this study, we investigated the effects of activation and stretch on the passive force–sarcomere length relationship in skeletal muscle. Single fibres from the lumbrical muscle of frogs were placed at varying sarcomere lengths on the descending limb of the force–sarcomere length relationship, and tetanic contractions, active stretches and passive stretches (amplitudes of ca 10% of fibre length at a speed of 40% fibre length/s) were performed. The passive forces following stretch of an activated fibre were higher than the forces measured after isometric contractions or after stretches of a passive fibre at the corresponding sarcomere length. This effect was more pronounced at increased sarcomere lengths, and the passive force–sarcomere length relationship following active stretch was shifted upwards on the force axis compared with the corresponding relationship obtained following isometric contractions or passive stretches. These results provide strong evidence for an increase in passive force that is mediated by a length-dependent combination of stretch and activation, while activation or stretch alone does not produce this effect. Based on these results and recently published findings of the effects of Ca 2+ on titin stiffness, we propose that the observed increase in passive force is caused by the molecular spring titin.

scholarly journals Titin force enhancement following active stretch of skinned skeletal muscle fibres

2017 ◽  
Vol 220 (17) ◽  
pp. 3110-3118 ◽  
Author(s):  
Krysta Powers ◽  
Venus Joumaa ◽  
Azim Jinha ◽  
Eng Kuan Moo ◽  
Ian Curtis Smith ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibres ◽  
Force Enhancement ◽  
Skeletal Muscle Fibres

Interferon-gamma-like immunoreactivity and T-cell marker expression in rat skeletal muscle fibres

1989 ◽  
Vol 504 (2) ◽  
pp. 306-310 ◽  
Author(s):  
Inger Nennesmo ◽  
Tomas Olsson ◽  
Åke Ljungdahl ◽  
Krister Kristensson ◽  
Peter H. Van der Meide
Keyword(s):  
Skeletal Muscle ◽  
T Cell ◽  
Interferon Gamma ◽  
Muscle Fibres ◽  
Cell Marker ◽  
Rat Skeletal Muscle ◽  
Marker Expression ◽  
Skeletal Muscle Fibres
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