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Titolo:
Effects of 28-day mechanical and chewing stress on content of bound and diffusible ions in muscles of mastication
Autore:
Gedrange, T; Kuhn, UD; Walter, B; Harzer, W; Bauer, R;
Indirizzi:
Tech Univ Dresden, Dept Orthodont, D-8027 Dresden, Germany Tech Univ Dresden Dresden Germany D-8027 hodont, D-8027 Dresden, Germany Univ Jena, Inst Clin Pharmacol, D-6900 Jena, Germany Univ Jena Jena Germany D-6900 Inst Clin Pharmacol, D-6900 Jena, Germany Univ Jena, Inst Pathophysiol, D-6900 Jena, Germany Univ Jena Jena Germany D-6900 a, Inst Pathophysiol, D-6900 Jena, Germany
Titolo Testata:
EXPERIMENTAL AND TOXICOLOGIC PATHOLOGY
fascicolo: 2-3, volume: 53, anno: 2001,
pagine: 207 - 213
SICI:
0940-2993(200106)53:2-3<207:EO2MAC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE SPECTROSCOPY; HUMAN MASSETER MUSCLE; RAT SKELETAL-MUSCLE; SARCOMERE-LENGTH; POTASSIUM; EXERCISE; FATIGUE; CALCIUM; FORCE; PHOSPHORUS;
Keywords:
muscle fibre types; muscle electrolyte; ion regulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Gedrange, T Klinikum TU Dresden, Poliklin Fieferorthopad, Fetscherstr 74, D-01307 Dresden, Germany Klinikum TU Dresden Fetscherstr 74 Dresden Germany D-01307 ny
Citazione:
T. Gedrange et al., "Effects of 28-day mechanical and chewing stress on content of bound and diffusible ions in muscles of mastication", EXP TOX PAT, 53(2-3), 2001, pp. 207-213

Abstract

Type I and type IT muscle fibres have different ion concentrations. Muscles adapt to chronic stress by changing of fibre types and remodelling of themyosin heavy chains in the muscle fibres. The present investigation on ionic change during muscular contraction was carried out on 10-week-old pigs (6 treated animals, 6 controls) over a 28-day period. Six pigs received acrylic build-ups to induce mechanical advancement of the lower jaw and chronic chewing stress. Muscle tissue was taken from the masseter (M1, M2, M3), temporal (TP1, TP2), medial pterygoid (PM) and geniohyoid (GH) muscles by a standardized method. Eighty-four muscle samples were used for histological fibre differentiation with mATPase. Energy-dispersive X-ray microanalysis of muscles was carried out in an environmental scanning electron microscope. Endurance stress in the stressed muscles was seen as an increase of type I fibres (P < 0.001). This histological change and ionic alterations were measured in the anterior region of the masseter (M1 and M2) and in the posterior region of the temporal muscle (TP2), Smaller changes were found in the medial pterygoid muscle. We measured in this muscles increases in potassium, sulphur, chloride (P < 0.05) and even larger increases in phosphate (up to 1.5 mmol/g to 2.3 mmol/g. P < 0.001) and sodium (3-fold, P < 0.001). The results reveal the effects of chronic stress on muscle fibres and ion concentration in the muscle. Chronic stress resulted in an increase of type I fibres and increased ion concentration in thesame muscle region. These are considered to be indicators of more efficient contraction. The changes in ion concentration are an important factor in muscle contraction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:46:19