For decades, wearables have been built on male-centered biology — assuming your body operates the
same way every day.
Women's bodies don't work like that.
Your heart rate, body temperature, HRV, and sleep stages shift every week of your cycle — there is no single "baseline"
The same workout, the same sleep schedule, the same diet produce different outcomes depending on your hormonal phase
Life phases — pregnancy, postpartum, perimenopause — require entirely different models, not just adjusted thresholds
Your body is not inconsistent. It's dynamic. It follows a pattern.
CURV's Rhythm Intelligence is a female-first model built to decode your biological rhythms and
deliver health insights that adapt to your body.
Meet the three biological rhythms —— the multi-layered timing system that drives women's health
The Daily Rhythm (Circadian)
Your 24-hour cycle of cortisol, melatonin, and body temperature. It controls when you feel alert, when you sleep, and how you recover. In women, this rhythm shifts across the month in ways male-based models never
account for.
The Monthly Rhythm (Menstrual)
A 21–35 day hormonal cascade that doesn't just control your period — it reshapes your sleep, metabolism, immune function, mood, and brain chemistry every single month.
The Life Rhythm (Life Phase)
From puberty to postmenopause, your body moves through fundamentally different operating states — each with its own rhythmic signature that changes how the other two layers behave.
These three rhythms interact, overlap, and shape each other. CURV's Rhythm Intelligence™ tracks how they influence your body — understanding what your rhythms affecting yourd your sleep, energy, mood, and health in a whole picture.
Your rhythm system actively drives what you feel, how you perform, and whether you recover — a new
lens to understand your health as a whole.
Here's how your three rhythms show up across every dimension of your daily life:
Menstrual Cycle & Hormones
The menstrual cycle is not a single event — it is a 21–35 day hormonal cascade that reorganizes
nearly every physiological system. Estradiol, progesterone, LH, and FSH rise and fall in a
coordinated sequence, altering thermoregulation, immune activity, neurotransmitter synthesis, and
metabolic substrate use. Each phase — follicular, ovulatory, luteal, menstrual — creates a distinct
internal environment.
These hormonal shifts produce real, measurable symptoms: breast tenderness, pelvic cramping,
headaches, water retention, acne flares, joint laxity, temperature elevation, and changes in
cervical mucus — all signals of a system in constant transition. What women often dismiss as "random
bad days" are predictable consequences of where they sit in this cascade.
CURV's Rhythm Intelligence maps your position within this hormonal sequence and interprets your
biometrics accordingly — turning isolated symptoms into a coherent physiological narrative.
Sleep & Recovery
Sleep architecture is not static across the cycle. Progesterone elevation in the luteal phase
reduces slow-wave sleep duration, increases nighttime awakenings, and raises core body temperature —
all of which degrade sleep efficiency. Estrogen withdrawal around menstruation disrupts sleep onset
latency. During life phase transitions — perimenopause, postpartum — circadian alignment itself
becomes unstable, and sleep fragmentation can persist for months.
CURV identifies these hormonally-driven sleep changes and distinguishes them from behavioral factors
— giving you an accurate picture of what's driving your sleep quality and where recovery is truly
compromised.
Mood & Stress
Ovarian hormones are neuroactive. Estradiol modulates serotonin and dopamine receptor density;
progesterone metabolites (allopregnanolone) act directly on GABA-A receptors. When these hormones
shift rapidly — particularly in the late luteal phase — the neurochemical environment changes within
days, creating vulnerability windows for mood instability, irritability, anxiety, and heightened
stress reactivity. This is not psychological — it is biochemical.
CURV correlates your physiological stress markers with cycle phase, making the hormonal signal
visible within what otherwise feels random — and helping you distinguish a hard day from a hard
phase.
Energy, Metabolism & Movement
Estradiol promotes glucose uptake, supports mitochondrial efficiency, and enhances exercise
motivation. In the high-estrogen follicular phase, performance capacity, VO2 max utilization, and
metabolic rate are elevated. As progesterone dominates in the luteal phase, the body shifts toward
fat oxidation, insulin sensitivity decreases, and perceived exertion rises for the same workload.
Training without accounting for this means you're either under-recovering or under-performing —
without knowing why.
CURV tracks your energy and activity patterns relative to your cycle phase — showing you when to
push, when to adapt intensity, and when to prioritize recovery.
Appetite, Gut & Nutrition
Estradiol suppresses appetite via hypothalamic signaling. When it declines in the luteal phase, this
restraint is reduced — caloric drive increases by an estimated 100–300 kcal/day, with heightened
preference for carbohydrate and fat-dense foods. Simultaneously, progesterone slows gastrointestinal
motility, contributing to bloating, altered bowel patterns, and changes in nutrient absorption
timing. Micronutrient demands also shift across the cycle — iron loss during menstruation, increased
magnesium utilization in the luteal phase, and fluctuating B6 requirements that support
progesterone metabolism.
CURV contextualizes your appetite, digestive, and nutritional shifts within your hormonal pattern —
reframing them as predictable physiology rather than behavioral failure.
Cognition & Focus
Estradiol enhances prefrontal cortex activity, supporting working memory, verbal fluency, and
executive function. Progesterone can dampen cognitive processing speed and reduce attentional
control. Research documents measurable shifts in attention and memory performance across cycle
phases — including the "brain fog" many women report in the late luteal phase. These are not signs
of decline; they are transient, hormonally-mediated shifts in neural resource allocation.
CURV models your cognitive readiness based on sleep quality, HRV, and cycle phase — helping you
align high-demand tasks with your phases of peak mental clarity.
CURV reads your health through two dimensions — Body and Mind — connected by one underlying engine:
your Rhythm. Every metric is interpreted relative to where you are in your cycle, your day, and your, life phase.
Body — how you sleep, move, digest, and recover.
Mind — how you feel, focus, and handle stress.
Rhythm — the hormonal timing system that explains why both shift.
This is Body-Mind Balance — not a static score, but a dynamic understanding of how your whole system
finds equilibrium. CURV doesn't just show you what's happening — it shows you why, and how to find
your balance.
Sense — Continuous, Whole-Body Tracking
CURV combines 24/7 physiological sensing with a complete female symptom logging system — capturing
both what your body is doing and what you're experiencing.
What CURV measures :
An advanced sensor array built into a single ring — optical PPG, infrared thermometer, and 6-axis
motion sensing — continuously capturing:
Sleep quality & recovery
Heart rate & HRV
Stress & resilience
Body temperature & cycle phase
Activity & energy expenditure
Blood oxygen & respiratory rate
What you log:
Period & fertility — flow, clots, color, spotting, discharge, ovulation signs
Symptoms — pain, bloating, breast tenderness, skin changes, cravings, digestive shifts
Mood & energy — energy level, mood state, mood triggers
Daily context — water intake, caffeine, supplements, exercise, stress events
Understand — Your Personal Rhythm Intelligence
Built on female-first data — our models are trained exclusively on women's physiological datasets
and validated peer-reviewed female health research.
CURV's AI doesn't compare you to population averages. It builds your unique baseline — and watches how it
evolves.
Personal baseline modeling:
Your metrics from cycle to cycle are compared against yourself — not a generic 28-day template. CURV
learns your unique cycle length, your typical HRV range in each phase, your temperature shift
pattern, and your individual sleep architecture.
Cross-cycle pattern recognition:
The AI identifies recurring signatures across your rhythm layers — detecting which symptoms cluster
together, which phases are your vulnerability windows, and how your patterns shift over months.
("Your insomnia and bloating always co-occur on cycle days 22–25." "Your HRV drops 3 days before
your period starts.")
Early shift detection:
By learning your personal norms, CURV detects deviations before they become symptoms — flagging when
your rhythm is drifting from its usual pattern, so you can respond early rather than react late.
Powered by adaptive AI:
CURV's rhythm engine combines time-series analysis, cycle-phase segmentation, and multi-signal
correlation — continuously learning from your data. The longer you wear it, the smarter it gets.
Guide — Actionable, Science-Backed Insights
Based on where you are in your rhythms right now, CURV delivers personalized guidance that adapts to
your body's current state:
- Nutrition — micronutrient and macronutrient timing aligned with your metabolic shifts
- Movement — exercise intensity recommendations matched to your hormonal energy arc
- Recovery — when to prioritize rest based on your HRV trend and cycle phase
- Skincare — Routine adapted to hormonal skin changes across your cycle
- Mental load — when to schedule demanding cognitive work vs. lighter tasks
Every recommendation is generated from your personal rhythm model — your data, your patterns, your current phase. It updates daily as your body moves through its rhythms.
We're actively collaborating with researchers, clinicians, and domain experts dedicated to advancing
women's health science. If you share this mission, let's build the future of women's health
together. [Join Our Research Program →]