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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 83 (2000), S. 166-174 
    ISSN: 1439-6327
    Keywords: Key words Fatigue ; Skeletal muscle ; Calcium ; Sarcoplasmic reticulum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Repeated activation of skeletal muscle causes fatigue, which involves a reduced ability to produce force and slowed contraction regarding both the speed of shortening and relaxation. One important component in skeletal muscle fatigue is a reduced sarcoplasmic reticulum (SR) Ca2+ release. In the present review we will describe different types of fatigue-induced inhibition of SR Ca2+ release. We will focus on a type of long-lasting failure of SR Ca2+ release which is called low-frequency fatigue, because this type of fatigue may be involved in the muscle dysfunction and chronic pain experienced by computer workers. Paradoxically it appears that the Ca2+ released from the SR, which is required for contraction, may actually be responsible for the failure of SR Ca2+ release during low-frequency fatigue. We will also discuss the relationship between gross morphological changes in muscle fibres and long-lasting failure of SR Ca2+ release. Finally, a model linking muscle cell dysfunction and muscle pain is proposed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7225
    Keywords: diet ; dysplasia ; mouth neoplasms ; precancerous conditions ; risk factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objectives: Oral epithelial dysplasia (OED) is a histopathologic diagnosis associated with an increased risk of oral cancer. The paper explores the relationship between OED risk and food group intake. Methods: In this case–control study, incident cases of OED were identified through two oral pathology laboratories. Controls, pair-matched 1:1 to cases on age ( ± 5 years), gender, appointment date ( ± 1 year), and surgeon, were identified through the office in which the respective case was biopsied. Exposure data were obtained via a telephone interview and mailed food-frequency questionnaire. cConditional logistic regression was used to obtain odds ratio point estimates. Results: Based upon 87 matched pairs – and after controlling for smoking, drinking, and other potential covariates–there was an apparent inverse relationship between OED risk and the consumption of fruits and vegetables, with the intake of these foods being associated with a strong attenuating effect among smokers. OED risk decreased with increased poultry consumption, but increased modestly with bread/cereal and dairy food intake. Conclusions: This investigation provides evidence that some aspects of diet may be associated with the risk of OED. It also suggests that in oral carcinogenesis the role of diet is not simply one of a late effect.
    Type of Medium: Electronic Resource
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