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Dietary sodium intake and changes in plasma volume during short-term exercise training
1Department of Exercise and Sport Science, University of Utah, Salt Lake City, USA.
International Journal of Sports Medicine
|October 1, 1995
Summary
Dietary sodium intake significantly impacts plasma volume expansion following endurance exercise. Higher sodium intake correlated with greater plasma volume shifts in athletes, suggesting its crucial role in training adaptation.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Human Physiology
Background:
- Individual responses to endurance training vary significantly.
- Plasma volume expansion is a key adaptation to exercise training.
- The role of dietary factors in these adaptations requires further investigation.
Purpose of the Study:
- To examine the relationship between dietary sodium intake and training-induced plasma volume changes.
- To explore potential factors contributing to inter-individual variability in plasma volume shifts.
- To investigate the influence of sodium on acute exercise adaptation.
Main Methods:
- Retrospective analysis of 10 healthy males undergoing 3 days of stationary cycling.
- Dietary sodium intake estimated from diet records.
- Plasma volume measured pre- and post-training using Evan's blue dye dilution.
Main Results:
- A mean plasma volume increase of 4.53 ml/kg body weight (11%) was observed.
- Individual plasma volume shifts ranged widely from -1.44 to 14.30 ml/kg body weight.
- A strong positive correlation (r=0.81) was found between estimated dietary sodium intake and plasma volume changes.
Conclusions:
- Dietary sodium intake is strongly associated with training-induced plasma volume shifts.
- Sodium intake may be a critical factor influencing the magnitude of plasma volume expansion.
- Further research is warranted to confirm the role of sodium in exercise adaptation.