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  • Title: Age-dependent decreases of phosphorus and magnesium in human Achilles' tendons.
    Author: Tohno Y, Takano Y, Tohno S, Moriwake Y, Minami T, Takakura Y, Yuri K.
    Journal: Biol Trace Elem Res; 2000 Apr; 74(1):1-9. PubMed ID: 11049195.
    Abstract:
    To elucidate changes of human tendons with aging, the authors studied age-related changes of elements in human Achilles' tendons by inductively coupled plasma-atomic emission spectrometry. The subjects consisted of seven men and seven women, ranging in age from 61 to 97 yr. It was found that the content of calcium increased progressively with aging in the Achilles' tendons, whereas the contents of phosphorus and magnesium decreased gradually with aging. The previous investigations demonstrated that the content of calcium and phosphorus increased progressively with aging in most, but not all, human tissues, except for the bones. In ligaments, such as the anterior cruciate ligament and the ligament of the head of the femur, which are histologically similar to the Achilles' tendon, it was previously found that both the contents of calcium and phosphorus increased with aging in the ligaments. It should be noted that the content of phosphorus in the Achilles' tendons decreased during the aging process. In addition, it was found that there was a very high direct correlation between phosphorus and magnesium contents in the tendons, but not between calcium and phosphorus contents.
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