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RELATIVE CHANGES IN SALIVARY SODIUM AND POTASSIUM IN RELATION TO EXPOSURE TO HIGH G STRESS
Gurmukh Singh1, E M Iyer2, H Malik1
1Assoc Prof, Aerospace Medicine; Institute of Aerospace Medicine, Vimanapura, Bangalore-560017.
Abstract:
Salivary Na+ and K+ was studied in 16 fighter pilots who were undergoing one week of intensive training for improving their tolerance to G stress. Their saliva was collected on first, third/fourth and sixth day of training. The subjects were also administered a stress coping strategy inventory to obtain scores on their pattern of stress coping. The results showed that K+ increased by 9.45 mEq/1 (p < 0.01) whereas Na+ decreased by 3.58 mEq/L (p > 0.05) under peak stress situation. Both K+ and Na+ showed a non significant decrease of 4.81 and 2.93 mEq/1 respectively in third sample (post stress) compared to second sample (peak stress). K+ concentration in saliva showed a transient phasic shift whereas Na+ concentration showed a more persistent tonic shift in relation to G stress. Regression analysis showed significant positive correlation of baseline Na+ with score on danger control strategy. A significant negative correlation was found between score on danger control strategy and baseline and poststress K/Na ratio.
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