Heat stress responses in men after ingestion of a low-sodium diet

Ilona Pokora

Summary
Summary
Aim: The aim of this study was to examine the physiological and metabolical responses to exogenous heat stress after ingestion of a low-sodium diet (580 mg Na/24 h/person).
Material and method: The study included 11 healthy males non-exercising and non-acclimating to heat. The participants were volunteers (aged 21.44±0.91 years, body height 178.3±2.28 cm, body weight 72.54±4.97 kg). The participants took part in two research tasks. Before the experiment, after diet, heat stress and the 24 hour long recovery period, the samples of vein blood were collected. They also assessed the changes in body mass and body composition after receiving the diet and after the heat stress in both tasks (weight, bioimpedance TANITA, Poland) and the changes in water distribution in body water compartments.
Results: The obtained results indicate that the reduction of sodium availability after ingestion of low sodium diet, increases heat accumulation during thermal stress as the result of decrease in water availability to sweating.
Conclusions: Diminution of sodium amount in adult males obstructs the proper rehydration during recovery despite of strong activation of sodium-saving mechanisms.

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