Sweat Electrolyte Profiles During Daily Physical Activities Among Chinese Adults

Area of Science:

• Exercise Physiology
• Human Physiology
• Sports Science

Background:

• Recreational exercise is increasingly popular among Chinese adults.
• Limited data exists on sweat rate and electrolyte composition for this demographic during daily activities.
• This study addresses the need for population-specific hydration data.

Purpose of the Study:

• To characterize hydration status, sweat rate, and sweat electrolyte composition in Chinese adults during common exercises.
• To examine sex-related differences in these physiological responses.
• To establish baseline data for public health hydration education and technology development.

Main Methods:

• A cross-sectional study involving 285 healthy Chinese adults (143 men, 142 women).
• Participants engaged in 60-minute sessions of brisk walking, running, or cycling under controlled conditions.
• Sweat samples were analyzed for electrolytes (Na+, K+, Ca2+, Mg2+, Fe, Zn2+, Cu2+); sweat rate and body mass loss were calculated.

Main Results:

• Overall mean sweat rate was 0.71 L/h, with running showing higher rates (0.92 L/h) than walking or cycling.
• Mean whole-body Na+ concentration was 34.10 mmol/L, with 59.3% having moderate levels.
• Men had higher sweat rates and Na+ levels; women had higher K+, Zn2+, and Cu2+ levels.

Conclusions:

• Chinese adults undertaking daily physical activities in temperate conditions exhibit low-to-moderate sweat rates and sodium concentrations.
• Findings offer essential reference data for tailored hydration strategies and public health initiatives.
• Results can guide the validation and application of wearable sweat-monitoring devices.