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Query: UMLS:C0848237 (acute stress)
 4,619 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Adaptation processes in an acute stress situation were investigated an compared in young and elderly subjects. Insulin hypoglycemia was used to provoke stress. The behavior of the blood sugar after administration of 0.1 U/kg old insulin shows a marked hypoglycemic state after 30 minutes, both in the young and in the older subjects. The rise into the normal range occurs considerably quicker in the young than in the elderly. Adrenaline excretion is distinctly lowered in older people. Measurement of hydrocortisone excretion also shows a lower reaction level and a delayed onset in the elderly. Growth hormone analysis shows a smaller production in advanced age. It is consequently established that adaptation potential decreases in old age.
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PMID:Altered adaptation behavior in the elderly (author's transl). 82 16

Growth hormone (GH) and insulin-like growth factors (IGFs) play a major role in fish development and metabolism, and several studies have allowed discernment of a complex and tissue-specific collection of salmonid IGF-I transcripts (Ea-4, Ea-3, Ea-2, Ea-1), which are the result of the alternative splicing of the E-domain region. However, the pattern of IGF-I expression is different in non-salmonid fish, and only one or two transcripts (Ea-4, Ea-2) have been detected in hepatic and extrahepatic tissues of common carp, barramundi, black sea bream and gilthead sea bream. Despite this, when comparisons are made within Mediterranean fish species (European sea bass, common dentex and gilthead sea bream), plasma IGF-I levels are consistent with fish species differences in growth rates. Changes of growth rates, and plasma IGF-I and GH levels are also found in response to changes in diet composition and ration size, which may serve to assess the suitability of feeding regimes in aquaculture practice. Regulation of plasma somatolactin (SL) levels is also examined in gilthead sea bream, and the resulting plasma SL profile differs from that of GH. Thus, in contrast to GH, plasma SL levels augment with the increase of ration size and fish size (advancement of age). A transient increase in plasma SL levels is also found in short-term fasted fish, and this fish peptide may act as an anti-obesity hormone helping to expedite growth-reproductive processes following replenishment of fat stores, and/or mediate the adaptation to fasting until the lipolytic action of GH and/or other endocrine factors is fully accomplished. This agrees with the known increase of plasma SL levels during acute stress and exhaustive exercise. However, a causal link between SL and energy mobilisation (lipid metabolism) remains to be established, and further research is needed to determine the extent to which SL and GH act in a complementary manner to make available metabolic fuels and to regulate body fat mass and feeding behaviour.
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PMID:Somatotropic regulation of fish growth and adiposity: growth hormone (GH) and somatolactin (SL) relationship. 1173 31