Physiological Marker Trajectory
Endurance / Trained
Simulate duration on gender-affirming hormone therapy (GAHT) and observe peer-reviewed changes in aerobic and muscular markers.
Puberty Status:
Baseline:
Hemoglobin / Hct
-11.2%
Reaches female reference norm by mo 3–4.
Lean Muscle Mass
-4.5%
Modest 3-5% drop; training mitigates loss.
Grip / Peak Power
-7.0%
Gradual upper body isometric force drop.
Bone Density & Levers
-1.0%
Structural skeletal dimensions preserved.
Hemoglobin & O2 (Rapid 0-4m)
Lean Muscle Mass (Gradual)
Peak Isometric Force
Skeletal Structure (Invariant)
Sports Federation Policy Matrix
6 Bodies Analyzed
Compare eligibility benchmarks, testosterone ceilings, and category definitions across major international bodies.
Sport-Specific Physiological Demand vs Transition Shifts
Middle-Distance Running
Explore how physiological parameters weigh differently into performance across disciplines.
Discipline Performance Demand Breakdown:
Physiological Impact Synthesis
In middle-distance running, aerobic capacity (VO2max) and hemoglobin/hematocrit levels carry ~55% of the performance determinant. Rapid equilibration of red cell mass to female levels within 3–4 months leads to notable endurance convergence, while retention of stride length and lower limb skeletal levers provides modest residual mechanics.
Federation Cross-Reference: World Athletics (2023) prohibits female category entry post-male puberty, superseding earlier 5.0 nmol/L suppression rules.
📚 Peer-Reviewed Sports Medicine & Endocrine Literature Citations
Harper et al. (2021) — British Journal of Sports Medicine
How does hormone transition in transgender women change body composition, muscle strength and haemoglobin? Systematic review.
Roberts, Smalley & Wendt (2020) — Sports Medicine
Effect of gender affirming hormones on athletic performance in transwomen and transmen: review of physical fitness markers.
Hilton & Lundberg (2020) — Sports Medicine
Transgender Women in the Female Category of Sport: Perspectives on Testosterone Suppression and Performance Advantage.
Hamilton et al. (2021) — International Journal of Environmental Research
Integrating Transgender and Cisgender Athletes in Competitive Sport: Physiological and Policy Perspectives.