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Characteristics of tetanic force produced by the sternomastoid muscle of the rat.

Sobotka S, Mu L - J. Biomed. Biotechnol. (2010)

Bottom Line: It also has unique anatomical advantages that allow its wide use in head and neck tissue reconstruction and muscle reinnervation.However, little is known about its contractile properties.These data are important not only to better understand the contractile properties of the rat SM muscle, but also to provide normative values which are critical to reliably assess the extent of functional recovery following muscle reinnervation.

View Article: PubMed Central - PubMed

Affiliation: Department of Research, Upper Airway Research Laboratory, Hackensack University Medical Center, Hackensack, NJ 07601, USA.

ABSTRACT
The sternomastoid (SM) muscle plays an important role in supporting breathing. It also has unique anatomical advantages that allow its wide use in head and neck tissue reconstruction and muscle reinnervation. However, little is known about its contractile properties. The experiments were run on rats and designed to determine in vivo the relationship between muscle force (active muscle contraction to electrical stimulation) with passive tension (passive force changing muscle length) and two parameters (intensity and frequency) of electrical stimulation. The threshold current for initiating noticeable muscle contraction was 0.03 mA. Maximal muscle force (0.94 N) was produced by using moderate muscle length/tension (28 mm/0.08 N), 0.2 mA stimulation current, and 150 Hz stimulation frequency. These data are important not only to better understand the contractile properties of the rat SM muscle, but also to provide normative values which are critical to reliably assess the extent of functional recovery following muscle reinnervation.

No MeSH data available.


Related in: MedlinePlus

Muscle force as a function of passive tension before stimulation. This force-tension curve was normalized by maximal force to illustrate the rate of decline of force at different passive tensions (set up just before electrical stimulation). The nerve was stimulated with 0.1 mA pulses at 200 Hz. The group average is shown. Vertical bars represent standard error of the mean. Nerve stimulation at moderate tension of the muscle (0.08 N) yielded maximal muscle force (0.94 N). The data presented in this and all following figures were collected, when the nerve was stimulated with a 200 ms train of biphasic pulses of 0.2 ms width.
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fig2: Muscle force as a function of passive tension before stimulation. This force-tension curve was normalized by maximal force to illustrate the rate of decline of force at different passive tensions (set up just before electrical stimulation). The nerve was stimulated with 0.1 mA pulses at 200 Hz. The group average is shown. Vertical bars represent standard error of the mean. Nerve stimulation at moderate tension of the muscle (0.08 N) yielded maximal muscle force (0.94 N). The data presented in this and all following figures were collected, when the nerve was stimulated with a 200 ms train of biphasic pulses of 0.2 ms width.

Mentions: Muscle force is a function of muscle length produced by an initial stretch of the muscle before electrical stimulation. The muscle was stretched with the following tensions before stimulation: very loose (0.04 N), loose (0.06 N), moderate (0.08 N), tense (0.1 N), and very tense (0.24 N). We used 0.1 mA pulses at 200 Hz. The averaged data from the whole group of rats illustrating the decrease of muscle force at different passive tensions is shown in Figure 2. The typical length-force “inverted U” relationship was found as described by others [29, 30].


Characteristics of tetanic force produced by the sternomastoid muscle of the rat.

Sobotka S, Mu L - J. Biomed. Biotechnol. (2010)

Muscle force as a function of passive tension before stimulation. This force-tension curve was normalized by maximal force to illustrate the rate of decline of force at different passive tensions (set up just before electrical stimulation). The nerve was stimulated with 0.1 mA pulses at 200 Hz. The group average is shown. Vertical bars represent standard error of the mean. Nerve stimulation at moderate tension of the muscle (0.08 N) yielded maximal muscle force (0.94 N). The data presented in this and all following figures were collected, when the nerve was stimulated with a 200 ms train of biphasic pulses of 0.2 ms width.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2875700&req=5

fig2: Muscle force as a function of passive tension before stimulation. This force-tension curve was normalized by maximal force to illustrate the rate of decline of force at different passive tensions (set up just before electrical stimulation). The nerve was stimulated with 0.1 mA pulses at 200 Hz. The group average is shown. Vertical bars represent standard error of the mean. Nerve stimulation at moderate tension of the muscle (0.08 N) yielded maximal muscle force (0.94 N). The data presented in this and all following figures were collected, when the nerve was stimulated with a 200 ms train of biphasic pulses of 0.2 ms width.
Mentions: Muscle force is a function of muscle length produced by an initial stretch of the muscle before electrical stimulation. The muscle was stretched with the following tensions before stimulation: very loose (0.04 N), loose (0.06 N), moderate (0.08 N), tense (0.1 N), and very tense (0.24 N). We used 0.1 mA pulses at 200 Hz. The averaged data from the whole group of rats illustrating the decrease of muscle force at different passive tensions is shown in Figure 2. The typical length-force “inverted U” relationship was found as described by others [29, 30].

Bottom Line: It also has unique anatomical advantages that allow its wide use in head and neck tissue reconstruction and muscle reinnervation.However, little is known about its contractile properties.These data are important not only to better understand the contractile properties of the rat SM muscle, but also to provide normative values which are critical to reliably assess the extent of functional recovery following muscle reinnervation.

View Article: PubMed Central - PubMed

Affiliation: Department of Research, Upper Airway Research Laboratory, Hackensack University Medical Center, Hackensack, NJ 07601, USA.

ABSTRACT
The sternomastoid (SM) muscle plays an important role in supporting breathing. It also has unique anatomical advantages that allow its wide use in head and neck tissue reconstruction and muscle reinnervation. However, little is known about its contractile properties. The experiments were run on rats and designed to determine in vivo the relationship between muscle force (active muscle contraction to electrical stimulation) with passive tension (passive force changing muscle length) and two parameters (intensity and frequency) of electrical stimulation. The threshold current for initiating noticeable muscle contraction was 0.03 mA. Maximal muscle force (0.94 N) was produced by using moderate muscle length/tension (28 mm/0.08 N), 0.2 mA stimulation current, and 150 Hz stimulation frequency. These data are important not only to better understand the contractile properties of the rat SM muscle, but also to provide normative values which are critical to reliably assess the extent of functional recovery following muscle reinnervation.

No MeSH data available.


Related in: MedlinePlus