Anabolic Adaptations Occur in Conscripts During Basic Military Training Despite High Prevalence of Vitamin D...

Area of Science:

• Exercise Physiology
• Military Medicine
• Nutritional Biochemistry

Background:

• Conscripts in the Estonian Defense Forces experience high rates of medical discharge.
• Demanding physical training during basic military training (BMT) may contribute to premature dropout.
• Systematic studies on the causes of conscript dropout are lacking.

Purpose of the Study:

• To assess the physiological responses of Estonian conscripts to a 10-week BMT program.
• To identify potential limiting factors for physiological adaptation during military training.

Main Methods:

• A 10-week BMT study involving 94 Estonian conscripts (mean age 20.9 years).
• Fasting venous blood analysis performed four times during BMT and once post-training.
• Statistical analysis included repeated measures ANOVA and Pearson correlation.

Main Results:

• Significant increases in testosterone, testosterone-to-cortisol ratio, erythrocytes, hemoglobin, and hematocrit were observed during BMT.
• Serum ferritin concentration decreased significantly during BMT.
• Vitamin D deficiency prevalence increased from 42.6% to 80.8% during BMT, reaching 91.5% post-training; no correlation with testosterone.

Conclusions:

• BMT induces anabolic adaptations despite concurrent vitamin D deficiency and reduced iron status.
• High prevalence of vitamin D deficiency and declining iron status may limit physiological adaptations and physical work capacity.
• Vitamin D deficiency in conscripts is a significant concern requiring treatment.