الفهرس 
Physiology of aging
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Abstract
The aim of the present investigation was to demonstrate the effect of cold water immersion on some hemodynamic and metabolic parameters in adult and aged rats 48 male albino rats were used in this work, 24 of them are adult and the others are aged. The rats were classified into three main groups: Group Ι: Non stressed groups (adult and aged)(16 rats This group was further subdivided into 2 sub groups as follow:Group1a: Non stressed adult groups (8rats)Group1b: Non stressed aged groups (8 rats GroupΠ: Single water immersion groups(adult and aged) (16 rats):The single water immersion rats were then further subdivided into the following two subgroups GroupΠa: Single water immersion adult groups (8 rats)GroupΠb: Single water immersion aged groups(8 rats)GroupШ: Recurrent water immersion groups (adult and aged) (16 rats): The recurrent water immersion group was then further subdivided into two subgroups:GroupШa: Recurrent water immersion adult groups (8 rats)GroupШb: Recurrent water immersion aged groups (8 rats) In each of the previously mentioned groups, mean systolic blood pressure (MSBP), heart rate, contractility, vinyl mandelic acid (VMA), fasting serum sodium, potassium and lipids were performed.The results showed that, aged non stressed rats encountered increase of the mean systolic blood pressure, fasting serum lipids and VMA when compared to the corresponding values in adult non stressed rats In both single and recurrent exposure groups, adult and aged rats encountered a statistically significant increase of mean systolic blood pressure (MSBP), heart rate, contractility, VMA, fasting serum lipid profile, serum Na and significant decrease of serum KAged rats in both single and recurrent exposure groups,Encountered less significant increase of heart rate and contractility and more significant increase of SBP, VMA and fasting serum lipids when compared with adult rats in these groups.