Integumentary loss of calcium

Area of Science:

• Human Physiology
• Mineral Metabolism

Background:

• Calcium homeostasis is vital for numerous physiological processes.
• Understanding all routes of calcium loss, including integumentary, is crucial for metabolic balance.

Purpose of the Study:

• To quantify daily integumentary calcium loss in healthy young men.
• To investigate the influence of calcium intake, protein intake, and exercise on integumentary calcium loss.

Main Methods:

• Measured integumentary calcium loss over 6-day periods in 16 healthy young men.
• Varied dietary calcium (0.1-2.3 g/day) and protein (1-96 g N/day) intake.
• Assessed calcium loss during periods of strenuous exercise.

Main Results:

• Average daily integumentary calcium loss was 8.7 +/- 1.9 mg/m2.
• Calcium loss was not significantly affected by dietary calcium or protein intake.
• Strenuous exercise increased integumentary calcium loss to approximately 25 mg in 40 minutes.
• No compensatory decrease in urinary calcium excretion was observed following exercise.
• Integumentary calcium loss was independent of overall calcium balance.

Conclusions:

• Integumentary calcium loss represents a consistent daily loss pathway in young men.
• Dietary factors like calcium and protein intake do not modulate skin calcium loss under normal conditions.
• Physiological stress, such as strenuous exercise, can acutely increase integumentary calcium loss.