Nailfold capillary patterns in ballgame and endurance athletes

Area of Science:

• Physiology
• Microcirculation
• Sports Science

Background:

• Nailfold capillaries, observable via light microscopy, typically present as straight, U-shaped, and densely looped structures in healthy individuals.
• Factors like disease and lifestyle can alter nailfold capillary patterns, but the impact of physical activity and exercise training remains under-explored.

Purpose of the Study:

• To investigate the effects of exercise training on nailfold capillary patterns.
• To compare nailfold capillary morphology in endurance athletes, ballgame athletes, and sedentary healthy men.

Main Methods:

• Nailfold capillary patterns were assessed using light microscopy and a commercial analysis system.
• Measurements included capillary loop density, length, and width in three groups: endurance athletes (n=10), ballgame athletes (n=10), and sedentary healthy men (n=9).
• Reproducibility and bilateral differences were evaluated in five healthy men over three days.

Main Results:

• Nailfold capillary density was significantly higher in ballgame athletes compared to endurance athletes and sedentary men.
• Capillary loop length was significantly shorter in ballgame athletes than in endurance athletes and sedentary men.
• No significant differences were found in capillary loop density or length between endurance athletes and sedentary men, nor in capillary loop width across all groups.

Conclusions:

• Male ballgame athletes demonstrate unique nailfold capillary patterns compared to endurance athletes and sedentary individuals.
• These findings suggest that training for ballgames may induce specific adaptations in nailfold capillary morphology.