scholarly journals Electrical and mechanical properties and mode of innervation in scorpionfish sound-producing muscle fibres

2004 ◽  
Vol 207 (21) ◽  
pp. 3757-3763 ◽  
Author(s):  
T. Kobayashi
Keyword(s):  
Mechanical Properties ◽  
Muscle Fibres

scholarly journals Mechanical properties of red and white swimming muscles as a function of the position along the body of the eelAnguilla anguilla

2001 ◽  
Vol 204 (13) ◽  
pp. 2221-2230 ◽  
Author(s):  
K. D’Août ◽  
N. A. Curtin ◽  
T. L. Williams ◽  
P. Aerts
Keyword(s):  
Mechanical Properties ◽  
Body Length ◽  
Isometric Force ◽  
The Body ◽  
In Vivo Studies ◽  
Muscle Fibres ◽  
Entire Body ◽  
Work Output ◽  
Longitudinal Position

SUMMARYThe way in which muscles power steady swimming depends on a number of factors, including fibre type and recruitment, muscle strain, stimulation pattern and intensity, and the intrinsic mechanical properties of the muscle fibres. For a number of undulatory swimming fish species, in vivo studies have shown that muscles at different positions along the body are stimulated during different phases of the strain cycle. Moreover, some intrinsic contractile properties of the muscles have been found to vary according to their position along the body.We report the first results on the mechanical properties of the red and white muscles of an anguilliform swimmer, Anguilla anguilla. Small preparations (0.147–1.335mg dry mass) were dissected from positions at fractions of 0.2, 0.4, 0.6 and 0.8 of total body length (BL). We determined the time to 50% and 100% peak force and from the last stimulus to 50% relaxation for isometric contractions; we measured the sarcomere lengths that coincided with in situ resting length. None of these quantities varied significantly with the longitudinal position from which the fibres were taken. We also measured power and work output during contractions under conditions approximating those used in vivo (cycle frequency, 1Hz; strain amplitude, ±10%L0, where L0 is the length giving maximum isometric force). During these experiments, work output was affected by stimulation phase, but did not depend on the longitudinal position in the body from which the muscles were taken.Our results indicate that red and white eel muscles have uniform properties along the body. In this respect, they differ from the muscle of most non-anguilliforms, in which muscle kinetics varies in a systematic way along the body. Uniform properties may be beneficial for anguilliform swimmers, in which the amplitude of the travelling wave can be pronounced over the entire body length.

Mechanical properties of type I and type IIB single porcine muscle fibres

Meat Science ◽  
2006 ◽  
Vol 73 (3) ◽  
pp. 422-425 ◽  
Author(s):  
M. Christensen ◽  
C. Kok ◽  
P. Ertbjerg
Keyword(s):  
Mechanical Properties ◽  
Muscle Fibres ◽  
Type I ◽  
Porcine Muscle

Mechanical Properties of the Longitudinal and Circular Muscle in the Earthworm

1971 ◽  
Vol 55 (1) ◽  
pp. 101-110
Author(s):  
N. TASHIRO
Keyword(s):  
Mechanical Properties ◽  
Longitudinal Muscle ◽  
Circular Muscle ◽  
Tonic Contraction ◽  
Muscle Fibres ◽  
Field Stimulation ◽  
Free Solution ◽  
Tension Development ◽  
Phasic Contraction

1. The mechanical properties of the longitudinal and circular muscles of the earthworm, Pheretima communissima, were studied in various solutions. 2. In the longitudinal muscle, field stimulation elicited two distinct waves of tension development, i.e. phasic and tonic contractions. But in the circular muscle, these components were not distinguishable. 3. The phasic contraction in the longitudinal muscle increased in sodium-free (tris) solution while the tonic contraction was abolished. Neither the phasic nor the tonic contraction, however, was influenced by tetrodotoxin (3 x 10-6 M), d-tubocurarine (1.4 x 10-5M), or atropine (3.5 x 10-5 M). 4. The contraction in the circular muscle was suppressed in sodium-free solution and also by tetrodotoxin (3 x 10-6 M), but was not affected by d-tubocurarine (1.4 x 10-5 M) or by atropine (3.5 x 10-5M). 5. It is speculated that the phasic contraction of the longitudinal muscle is triggered by a calcium spike, and the contraction in the circular muscle is preceded by a sodium spike in muscle fibres.

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