الفهرس 
Introduction and aim of the workOnly 14 pages are availabe for public view
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Abstract
It is well established that physical training enhances glucose utilization by peripheral tissues particularly the skeletal muscles. Several investigators have reported that level of endogenous opioid peptides is increased in physically trained individuals. This elevated level may participate in the changes observed in carbohydrate metabolism in trained subjects. The present work was conducted to study the effect of physical training on carbohydrate metabolism and to evaluate the role of endogenous opioids on carbohydrate metabolism in response to physical training. Albino rats of both sexes were used in this work. The animals were incubated in the laboratory with free access to water and usual diet. The animals were then divided into 2 main groups: Group I : 40 sedentary rats(untrained group). Group II : 40 physically trained rats for 6 weeks (trained group). Each main group is subdivided into 4 subgroups: Group A : 10 control rats. Group B : 10 rats injected with naloxone (0.5 mg/kg I.P) . Group C : lO rats injected with naloxone and alpha- adrenergic blocker (phentolamine) (0.5 mg/kg I.P) . Group D : 10 rats injected with naloxone and beta- adrenergic blocker (propranolol) ( 1 mg/kg I.P) . The trained group was allowed to swim in a deep glass container five days per week for six weeks, the duration of swimming was gradually increased during the first two weeks untill the exercised rats could swim two hours per day.