A Systematic Review and Meta-Analysis of Within-Person Changes in Cardiac Vagal Activity across the Menstrual Cycle: Implications for Female Health and Future Studies

What this work gives Aellic

37 studies: meta-analytic d = −0.39, 95 % CI [−0.67, −0.11]; the primary literature is “not only inconsistent but contradictory”, two studies found the opposite direction, and only 42 % verified the phase hormonally. Too weak for a fixed constant — hence no cold-start offset for HRV.

Where this sits in the engine

1 declared site — constants and thresholds in the code that point at this entry.

• Cycle Phases and cycle-aware baselines 1 site