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  • Key words: Athletes — Testosterone — Calcium absorption — Strontium test — Calcium intake.  (1)
  • nutritional aspects of osteoporosis  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 28 (1989), S. 17-31 
    ISSN: 1436-6215
    Keywords: Calciumversorgung ; Bioverfügbarkeit von Calcium ; Osteoporose ; osteoporosis ; osteoporosis ; pathogenesis of ; calcium supply ; nutritional aspects of osteoporosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Osteoporosis primarily affects women and is a bone disease of great socialmedical and economic importance. The pathogenesis is thought to be of multifactorial origin. The current work discusses nutritional aspects relative to osteoporosis. In this aspect, calcium supply seems to have the largest preventional importance. In contrast, food statistics and individual food records show that calcium intake of females is below the DGE's recommendation of 800 mg/daily. Furthermore, in view of skeletal integrity, calcium intake should be increased up to 1,500 mg/daily after menopause, because of endocrinological changes in calcium metabolism. Therefore, calcium intake on the whole is usually found to not be sufficient. The importance of further nutritional aspects for manifestation of osteoporosis are discussed. In some cases, influences on skeletal integrity are quite evident, whereas the literature has only infrequently drawn conclusions about the pathogenesis of osteoporosis.
    Notes: Zusammenfassung Die Osteoporose ist eine Knochenerkrankung mit großer sozialmedizinischer und volkswirtschaftlicher Bedeutung, von der überwiegend Frauen betroffen sind. Die Pathogenese der Erkrankung ist multifaktoriell. Der derzeitige Kenntnisstand über die Bedeutung alimentärer Faktoren wird in diesem Zusammenhang dargestellt. Größte präventive Bedeutung besteht seitens der Ernährung in einer ausreichenden Calciumversorgung. Verzehrsstatistiken und individuelle Verzehrsprotokolle zeigen dagegen, daß die Versorgung mit Calcium beim weiblichen Geschlecht im Durchschnitt unter der Empfehlung der DGE von 800 mg/d liegt. Hinzu kommt, daß zur Aufrechterhaltung der Knochenhomöostase aufgrund endokriner Umstellungen im Calciumstoffwechsel empfohlen wird, nach der Menopause die Calciumaufnahme auf 1500 mg/d zu steigern. Die Versorgungslage mit Calcium ist somit insgesamt als sehr unzureichend anzusehen. Weitere ernährungsbedingte Faktoren mit Bedeutung für eine Osteoporosemanifestation werden diskutiert. In einigen Fällen ist hierdurch eine Beeinflussung der Knochenhomöostase durchaus denkbar, häufig ist das Datenmaterial allerdings noch zu unvollständig oder fehlt völlig, um Zusammenhänge zur Osteoporoseentstehung herstellen zu können.
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  • 2
    ISSN: 1432-0827
    Keywords: Key words: Athletes — Testosterone — Calcium absorption — Strontium test — Calcium intake.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The effect of physical activity on human calcium (Ca) metabolism is still not completely understood. Thus, we investigated fractional Ca absorption using a stable strontium test (Fc240), calciotropic hormones, and renal Ca excretion in 31 young men with a high activity level (GH) and in 26 age-matched sedentary control subjects (GL). Weekly hours spent on physical activity, obtained with a questionnaire were 15.0 ± 6.6 (GH) and 1.0 ± 1.4 (GL), respectively. Serum testosterone levels were significantly lower in GH compared with GL (P 〈 0.005). Dietary Ca intake (4-day food record) was twice as high in GH compared with GL men (P 〈 0.001). GH had significantly higher serum calcitriol levels and Fc240 values than GL (P 〈 0.001 and P 〈 0.01, respectively). In a stepwise multiple regression analysis including serum levels of 25-hydroxyvitamin D, calcitriol, testosterone, and dietary Ca intake, only calcitriol was significantly correlated with Fc240 (P= 0.017). Twenty-four hour renal Ca excretion was only slightly higher in GH compared with GL (P 〈 0.05). However, additional Ca losses might have occurred through the extensive sweating of GH, as indicated by a difference of 1.7 liter between fluid intake and renal fluid excretion (P 〈 0.001). In summary, we observed a higher fractional Ca absorption rate in physically active young men compared with sedentary controls which is probably mediated by calcitriol. The low testosterone serum levels of the athletes were obviously not a limiting factor in Ca absorption efficiency. An additional Ca retention might, however, only be obtained if absorbed Ca exceeded total obligatory Ca losses.
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