Effect of daily hyperhydration on fluid-electrolyte changes in endurance-trained volunteers during prolonged restriction of muscular activity |
| |
Authors: | Yan G Zorbas Youri F Federenko Konstantin A Naexu |
| |
Institution: | (1) European Institute of Environmental Cybernetics, GR-162 32 Athens, Greece |
| |
Abstract: | The aim of this investigation was to evaluate the effect of a daily intake of fluid and salt supplementation on fluid and
electrolyte losses in endurance-trained volunteers during prolonged restriction of muscular activity (hypokinesia). The studies
were performed on 30 long-distance runners aged 23–26 who had a peak oxygen uptake of 65.5 mL/kg/min and had taken 13.8 km/d
on average prior to their participation in the study. The volunteers were divided into three groups: The volunteers in the
first group were placed under normal ambulatory conditions (control subjects), the second group of volunteers subjected to
hypokinesia alone (hypokinetic subjects), and the third group of volunteers was submitted to HK and consumed daily 0.1 g sodium
chloride (NaCl)/kg body wt and 26 mL water/kg body wt (hyperhydrated subjects). The second and third group of volunteers were
kept under an average of 2.7 km/d for 364 d. During the pre-experimental period of 60 d and during the experimental period
of 364 d sodium, potassium, calcium, and magnesium in urine and plasma were determined. Blood was also assayed for osmolality,
hemoglobin, hematocrit, plasma volume, plasma renin activity and plasma aldosterone. Mean arterial blood pressure was also
determined. In the hyperhydrated volunteers plasma volume and arterial blood pressure increased, whereas plasma osmolality,
plasma renin activity, plasma aldosterone, hematocrit, hemoglobin concentration, and urinary excretion and concentrations
of electrolytes in plasma decreased. In the hypokinetic volunteers, plasma volume and arterial blood pressure decreased significantly,
whereas hematocrit values, hemoglobin concenfration, plasma osmolality, plasma renin activity, plasma aldosterone, and electrolytes
in urine and plasma increased significantly during the experimental period. It was concluded that chronic hyperhydration may
be used in minimizing fluid and electrolyte losses in endurance-trained volunteers during prolonged restriction of muscular
activity. |
| |
Keywords: | Hyperhydration fluid-electrolyte changes hypokinesia trained subjects |
本文献已被 SpringerLink 等数据库收录! |
|