Fluid electrolyte changes in trained subjects after water 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, Odos Agias Sophias 81, GR-162 32 Athens, Greece |
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Abstract: | The objective of this investigation was to determine fluid electrolyte changes after water-loading tests and during hypokinesia
(decreased number of km taken per day) and daily intake of fluid and salt supplementation (FSS). The studies during hypokinesia
(HK) were performed for 364 d on 30 endurance-trained male volunteers in the age range of 23–26 yr, with an average peak oxygen
uptake, POU, of 64 mL/kg/min. All volunteers were divided into three equal groups: 10 volunteers were placed on a continuous
regime of exercise of 14.4 km/d and served as control subjects (CS); 10 volunteers were submitted to continuous HK without
FSS and were considered as the unsupplemented hypokinetic subjects (UHS); and 10 volunteers were under continuous HK and FSS
and were considered as the supplemented hypokinetic subjects (SHS). For the simulation of the hypokinetic effect, the UHS
and SHS groups were kept continuously under an average of 2.7 km/d for the duration of the study. Prior to exposure to HK,
the two groups of volunteers were on the same exercise regime as the control group. During a 60-d preexperimental period and
during the remainder of the study, water-loading tests with a water load of 20 mL/kg body wt/min were performed, and urinary
and plasma electrolytes (sodium, potassium, calcium, and magnesium) were measured. In the SHS group, urinary excretion of
electrolytes and plasma electrolyte content decreased, while in the UHS these values increased after water loading tests and
during HK. Based on the obtained data, it is concluded that chronic hyperhydration may be used to prevent or minimize urinary
and plasma electrolyte changes in endurance-trained volunteers after water-loading tests and during prolonged restriction
of muscular activity. |
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Keywords: | Electrolytes urine plasma water load hypokinesia hyperhydration trained subjects |
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