No vibes. No moon mysticism. Just the studies that actually include women.
Below are eight peer-reviewed findings that shape how Luna Cycle Coaching programmes are built. Each is tagged by the phase it most affects and the strength of the underlying evidence — we don't claim certainty where the research is still emerging.
- Strong Large or replicated trials
- Moderate Mechanism clear, sample sizes smaller
- Emerging Active area, methodology evolving
- Follicular phaseModerate
Strength gains in the follicular phase
Higher oestrogen may support strength adaptation — this is the week to push heavy compound lifts.
A 2014 study found that follicular-phase strength training produced greater gains in muscle strength than luteal-phase training in the same women. We use it to front-load your heaviest sessions in weeks one and two.
- Luteal phaseStrong
Perceived effort in the luteal phase
Sessions can feel harder before your period even when the numbers are the same.
Reviews report elevated perceived exertion and core temperature in the luteal phase. We hold intensity steady but adjust volume and expectations — so a hard-feeling week reads as physiology, not failure.
- Ovulatory phaseStrong
Joint laxity peaks around ovulation
ACL and knee laxity rise around the ovulatory window. Technique is non-negotiable that week.
Multiple studies show increased knee joint laxity in the days surrounding ovulation, with corresponding increases in non-contact ACL injury risk. We program PR attempts here, but with strict technique cues and a hard cap on max-effort plyometrics.
- Luteal phaseModerate
Substrate utilisation shifts with cycle phase
Fat oxidation rises in the luteal phase — fuelling and pacing matter more.
Studies show a shift toward fat oxidation and reduced carbohydrate availability in the mid-luteal phase. Long, lower-intensity efforts respond well; under-fuelling shows up faster. We adjust pre-session carbs and hydration accordingly.
- Menstrual phaseModerate
Recovery prioritisation during menstruation
The first 1–3 days of bleeding are a recovery window, not a write-off.
Heavy bleeders can lose enough iron to affect aerobic capacity; the inflammatory response in early menses also reduces force-production tolerance. We don't cancel training — we deload, prioritise mobility and easy aerobic work, and watch iron status across the year.
- Follicular phaseEmerging
Hormonal contraception changes the picture, but not the principles
On hormonal birth control, the cycle is flatter — programming adapts, but the framework still applies.
Combined oral contraceptives suppress the natural hormonal swing, blunting some phase-specific effects but introducing pill-cycle patterns of their own. We map to your actual physiology, not a textbook average — and treat the pill-break week as its own programming consideration.
- Luteal phaseModerate
Heart rate and HRV vary across the cycle
Resting heart rate climbs in the luteal phase. Don't read it as detraining.
Resting heart rate and core temperature tend to rise in the luteal phase, and HRV often drops. We re-baseline your recovery metrics each cycle so a normal luteal-week HRV dip doesn't trigger an unnecessary deload — or get missed when it does signal something off.
- Menstrual phaseStrong
Sex differences in foundational sports-science research
Most of the training research you've read was based on men.
A 2014 audit found that women accounted for roughly 39% of participants in sports and exercise science research, and a smaller proportion in higher-quality studies. That is why generic plans miss — they weren't built on female physiology in the first place.
Every recommendation has a citation behind it.
Reading the studies is the easy part. Building a training plan that holds up week to week — and adapts when your physiology shifts — is the part you get a coach for.