Menarche in athletes: a synthesis and hypothesis.

Area of Science:

• Sports Medicine
• Human Biology
• Developmental Pediatrics

Background:

• The timing of menarche, the first menstrual period, is a key indicator of female reproductive maturation.
• Factors influencing menarcheal timing are complex and multifactorial.
• Athletes, particularly ballet dancers, tend to experience menarche later than the general population.

Purpose of the Study:

• To review the determinants of menarcheal timing in athletes.
• To investigate the apparent delay in menarche among athletes and identify contributing factors.
• To propose a hypothesis explaining the variations in menarcheal timing within athletic populations.

Main Methods:

• Review of existing scientific literature on menarcheal timing in athletes.
• Comparison of menarcheal data across different athletic disciplines and the general population.
• Analysis of biological maturity indicators (skeletal age, secondary sex characteristics) in relation to menarcheal timing.

Main Results:

• Menarche typically occurs later in athletes compared to non-athletes, with consistency across multiple countries.
• Swimmers represent an exception, with their menarcheal timing approximating that of the general population.
• Intensive physical training alone is difficult to isolate as a specific cause for delayed menarche due to numerous confounding variables.

Conclusions:

• A two-part hypothesis is proposed: biological selection (physique, skill) and social factors contribute to delayed menarche in athletes.
• Family size and composition are significant factors influencing menarcheal timing and warrant further consideration.
• The complex interplay of biological and social factors, including family dynamics, shapes the timing of menarche in athletic populations.