Potassium changes in trained subjects after potassium loading and during restriction of muscular activity and chronic hyperhydration |
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Authors: | Yan G Zorbas Youri F Federenko Konstantin A Naexu |
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Institution: | (1) Hypokinetic Physiology Laboratory, GR-162 32 Athens, Greece |
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Abstract: | The objective of this investigation was to determine whether urinary and plasma potassium changes developed during prolonged
hypokinesia (HK) (decreased number of km/d) in endurance-trained subjects could be minimized or reversed with a daily intake
of fluid and salt supplementation (FSS). The studies were performed on 30 endurance-trained male volunteers aged 23–26 yr
with an average peak oxygen uptake of 65 mL/kg min during 364 d of HK. All volunteers were on an average of 13.8 km/d prior
to their exposure to HK. All volunteers were randomly divided into three groups: 10 volunteers were placed continuously under
an average of 14.0 km/d (control subjects), 10 volunteers were subjected continuously to an average of 2.7 km/d (unsupplemented
hypokinetic subjects), and 10 volunteers were submitted continuously to an average of 2.7 km/d, and consumed daily an additional
amount of 0.1 g sodium chloride (NaCl)/kg body wt and 30 mL water/kg body wt (supplemented hypokinetic subjects). During the
prehypokinetic period of 60 d and during the hypokinetic period of 364 d, potassium loading tests were performed with 1.5–1.7
mEq potassium chloride/kg body wt, and potassium, sodium, and chloride excretion in urine and potassium, sodium, and chloride
in plasma were determined. In the unsupplemented hypokinetic volunteers, urinary excretion of electrolytes and concentrations
of electrolytes in plasma increased significantly as compared to the control and supplemented hypokinetic groups of volunteers.
It was concluded that daily intake of fluid and salt supplementation had a favorable effect on regulation of urinary and plasma
potassium changes in trained subjects during prolonged HK. |
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Keywords: | Potassium changes potassium loading hypokinesia hyperhydration trained subjects |
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