Document Detail

Chronic recombinant equine somatotropin (eST) administration does not affect aerobic capacity or exercise performance in geriatric mares.
MedLine Citation:
PMID:  9455156     Owner:  NLM     Status:  MEDLINE    
The purpose of this experiment was to test the hypothesis that chronic (89 days) administration of recombinant equine somatotropin (eST) would increase aerobic capacity and improve exercise performance in old mares. Fifteen, healthy, unfit, aged (20-26 year old) mares were randomly assigned to a treatment (eST, 12.5 mg day-1 in 3 ml glycine/manitol buffer, s.c., n = 7) or control (vehicle, 3 ml day-1, s.c., n = 8) group. Aerobic capacity and exercise performance were measured using a standardized exercise test (SET) performed on a high speed treadmill. Tests were conducted before (-21 days), during (+43 days and +89 days) and after (+127 days) treatment. During the SET, resting data were collected and the horses then ran up a fixed 6% grade, starting at 4 m s-1, with a 1 m s-1 increase every 60 s (omitting 5 m s-1) until fatigue. Oxygen uptake (VO2) was measured using an open flow calorimeter and blood lactate concentration (LA) via a lactate analyser. Venous blood samples (10 ml) were collected at rest, during the last 10 s of each step of the SET, and after exercise and used to measure LA, plasma protein concentration (PP), hematocrit (HCT), and the plasma concentrations of creatine kinase (CK) and aspartamine transferase (AST). There were no differences (P > 0.05) in resting VO2, LA, TPP, or HCT due to treatment or test time. Furthermore, there were no differences (P > 0.05) in maximal oxygen uptake (VO2max), top run velocity, run time, watts at VO2max, velocity to produce a lactate of 4 mmoll-1 (VLA4), watts at VLA4, peak HCT or peak LA. Finally, there were no differences (P > 0.05) in resting or post-exercise CK or AST. These data indicate that chronic eST administration does not affect aerobic capacity or indices of exercise performance in unfit aged mares.
K H McKeever; K Malinowski; R A Christensen; H D Hafs
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Veterinary journal (London, England : 1997)     Volume:  155     ISSN:  1090-0233     ISO Abbreviation:  Vet. J.     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-02-26     Completed Date:  1998-02-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9706281     Medline TA:  Vet J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  19-25     Citation Subset:  IM    
Department of Animal Science, Cook College, Rutgers-The State University of New Jersey, New Brunswick 08903-0231, USA.
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MeSH Terms
Aging / blood,  physiology*
Growth Hormone / administration & dosage,  pharmacology*
Horses / blood,  physiology*
Lactates / blood
Oxygen Consumption / drug effects,  physiology
Physical Conditioning, Animal / physiology*
Random Allocation
Recombinant Proteins / administration & dosage,  pharmacology
Reg. No./Substance:
0/Lactates; 0/Recombinant Proteins; 9002-72-6/Growth Hormone
Comment In:
Vet J. 1998 Jan;155(1):3-4   [PMID:  9455154 ]

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