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It has been demonstrated in experiments on male rats that liver injury induced by paracetamol is accompanied by inhibition of bile secretion and of the synthesis and secretion of bile acids, bilirubin elimination and cholesterol excretion with bile, by reduction in the cholate/cholesterol ratio. Activation of alanine-, aspartate aminotransferase and alkaline phosphatase of blood serum attests to a change in liver function. When administered in a toxic dose paracetamol induces lipid peroxidation of hepatocyte cell membranes. The correlation was established between lipid peroxidation, transaminases and alkaline phosphatase activity in blood serum and bile formation.
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The effect of positive acceleration on plasma levels of calcitonin gene related peptide (CGRP), and endothelin as well as renal function in pilots were observed in this study. 20 pilots were exposed to +2.5 Gz 10 s and +3.0 Gz 10 s with an interval of 5 min without anti-G suits. Samples of plasma and serum were taken 2Omin before and after exposure. Plasma levels of CGRP and endothelin after the exposure were significantly increased (P<0.01), but alkaline phosphatase(AKP), blood levels of beta 2-microglobulin(beta 2-MG), Ca2+ in serum showed no significant change (P>0.05) as compared with those before exposure. There was a correlation between CGRP and endothlin (r=0.772, P<0.01). It is concluded that positive acceleration(+2.5, +3.0Gz) could increase plasma levels of CGRP and endothlin but did not affect renal function.
A multiple regression equation was used to predict age from seven clinical variables in 1080 apparently well female subjects. A multiple correlation coefficient of R = 0.77 was achieved by five of the variables: timed forced expiratory volume, systolic blood pressure, plasma urea nitrogen, cholesterol, and alkaline phosphatase. On the basis of selection by medical questionnaire responses and other objective criteria, 9% of the subjects were nonsmokers and healthier than the rest. These selected subjects showed a significant reduction in preducted age. Within this group, subjective perception of health was associated with differences in predicted age: poor health with an increase and good health with a decrease in functional age. This study of functional age was based on the healthiest segment of the population in order to minimize the effect of overt pathological processes on the aging rate. An association has been demonstrated between health impairment and predicted age as a measure of the aging rate.
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