Sustained exercise augments long-term starvation increases in plasma growth hormone in the steelhead trout, Salmo gairdneri

1988 ◽  
Vol 66 (4) ◽  
pp. 853-855 ◽  
Author(s):  
Bruce A. Barrett ◽  
Brian A. McKeown
Keyword(s):  
Growth Hormone ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Hormone Concentration ◽  
Plasma Growth Hormone ◽  
Hormone Levels ◽  
Significant Difference ◽  
Normal Feeding ◽  
Stored Reserves

During the increased locomotor activity of migration many salmonids do not actively feed and it is likely that metabolic alterations occur to facilitate the mobilization of stored reserves. The present laboratory study was designed to simulate the occurrence of exercise and starvation as natural parameters of migration and to assess the effects of such parameters on levels of plasma growth hormone, which might indicate alterations in metabolism during migration. Juvenile steelhead trout, Salmo gairdneri, were starved for a 30-day period. Starved individuals exhibited a marked increase in plasma growth hormone concentration (38.6 ± 6.7 ng/mL) compared with control individuals held on a normal feeding regime (6.4 ± 1.84 ng/mL). A subgroup of fish from the starved group were exercised by being forced to swim at 1.5 body lengths/s for a 24-h period. Exercised individuals exhibited plasma growth hormone levels in excess of 140 ng/mL. There was no significant difference between the plasma growth hormone levels of unexercised starved fish and exercised fed fish.

Sustained Exercise Increases Plasma Growth Hormone Concentrations in Two Anadromous Salmonids

1988 ◽  
Vol 45 (4) ◽  
pp. 747-749 ◽  
Author(s):  
Bruce A. Barrett ◽  
Brian A. McKeown
Keyword(s):  
Growth Hormone ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Salmo Gairdneri ◽  
Steady Increase ◽  
Steelhead Trout ◽  
Plasma Growth Hormone ◽  
Plasma Gh

Sustained exercise for 24 h at 1.5 body lengths per second (bl/s) resulted in a severalfold increase in the plasma growth hormone (GH) concentration of steelhead trout (Salmo gairdneri) and coho salmon (Oncorhynchus kisutch). Peak levels occurred 10 min postexercise and returned to basal levels within 4 h of exercise termination. GH levels exhibited a steady increase after the fourth hour of exercise and peaked at 24 h. Individuals exercised for 48 h did not exceed plasma GH levels of the 24-h peak.

THE DIURNAL PATTERN OF PLASMA GROWTH HORMONE CONCENTRATION IN CHILDREN AND ADOLESCENTS

1966 ◽  
Vol 34 (2) ◽  
pp. 147-153 ◽  
Author(s):  
W. M. HUNTER ◽  
W. M. RIGAL
Keyword(s):  
Growth Hormone ◽  
Children And Adolescents ◽  
Hormone Concentration ◽  
Diurnal Pattern ◽  
Plasma Growth Hormone ◽  
Blood Samples ◽  
Hormone Levels ◽  
Growth Hormone Concentration

SUMMARY The diurnal pattern of plasma growth hormone levels has been investigated in nine children, without endocrinopathy, aged 8–15 yr., from whom blood samples were taken hourly during the day and 2-hourly at night. Growth hormone was undetectable (< 1 μmg./ml.) during the first 2 hr. after meals but the levels rose thereafter to values many times higher than those found in adults. High values were consistently encountered during the night.

Acetate: inhibitor of growth hormone hypersecretion in diabetic and non-diabetic uraemic subjects

1982 ◽  
Vol 99 (4) ◽  
pp. 551-558 ◽  
Author(s):  
Hans Ørskov ◽  
Aage Prange Hansen ◽  
Hans Erik Hansen ◽  
K. George M. M. Alberti ◽  
George A. Noy ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Normal Values ◽  
Hormone Secretion ◽  
Plasma Concentrations ◽  
Growth Hormone Secretion ◽  
Hormone Release ◽  
Plasma Growth Hormone ◽  
Blood Samples ◽  
Hormone Levels

Abstract. Five diabetic and 14 non-diabetic uraemic patients on long-term haemodialysis were studied during twenty-one 24 h periods including 5 to 7 h of haemodialysis against glucose-free acetate buffered dialysis fluid. Half-hourly blood samples were collected for hormonal and metabolite analysis. In addition, blood samples were analyzed in 40 experiments covering the haemodialysis and a pre-dialysis period. Before dialysis, plasma growth hormone levels were high and fluctuating, but almost always fell to low normal values within the first 2 h of haemodialysis. In the diabetic uraemic patients, the occasional severe hypoglycaemic episodes occurring during haemodialysis did not provoke growth hormone release, and hypoglycaemic reactions were not encountered. Intravenous acetate infusion studies resulted in plasma concentrations ranging from 1.3 to 2.7 mmol, i.e. about 60 per cent of the levels reached during haemodialysis and in suppression of growth hormone secretion. It is suggested that the fall in growth hormone levels and the lack of hypoglycaemic symptoms during haemodialysis is due to the use of acetate as a fuel in brain.

CHANGES IN PLASMA GROWTH HORMONE LEVELS IN RETARDED CHILDREN

2008 ◽  
Vol 12 (3-4) ◽  
pp. 294-306
Author(s):  
J. HILLMAN ◽  
J. HAMMOND ◽  
J. SOKOLA ◽  
M. REISS
Keyword(s):  
Growth Hormone ◽  
Plasma Growth Hormone ◽  
Hormone Levels

THE ROLE OF CONDENSED TANNINS IN THE DIGESTION OF FRESH Lotus pedunculatus BY SHEEP

1984 ◽  
Vol 64 (5) ◽  
pp. 181-182 ◽  
Author(s):  
T. N. BARRY
Keyword(s):  
Growth Hormone ◽  
Condensed Tannins ◽  
Condensed Tannin ◽  
Soluble Carbohydrate ◽  
Hormone Concentration ◽  
Plasma Growth Hormone ◽  
Tannin Concentration ◽  
Lotus Pedunculatus ◽  
Ruminal Digestion

Relative to non-tannin-containing fresh forages, condensed tannins in Lotus pedunculatus increased duodenal N flow and calculated absorption of amino acids from the small intestine, but depressed ruminal digestion of soluble carbohydrate and hemicellulose. Plasma growth hormone concentration was positively and linearly related to forage condensed tannin concentration. Key words: Condensed tannin, nitrogen digestion, growth hormone

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