What is BloomFit?

BloomFit is a cycle-aware AI fitness coach for women who train regularly and want clear daily guidance from their own body data. It combines Apple Health data, menstrual cycle context, workout preferences, and AI coaching to answer one practical question: what should I do today, and how hard should I go?

BloomFit is designed for active women who often train independently - running, strength training, yoga, Pilates, HIIT, or mixed routines - and want to stay consistent without ignoring recovery, fatigue, or cycle-related changes.

What BloomFit helps you do

BloomFit turns body signals into training decisions:

See your daily body state through key metrics such as Recovery, Body Energy, Sleep, training load, and biometric signals.
Understand how your current cycle phase may affect energy, recovery, temperature, and perceived effort.
Get a personalized daily workout plan based on your goals, available time, workout preferences, and current readiness.
Ask AI Coach follow-up questions when a score or recommendation does not match how you feel.
Review workout records and use them to adjust future training.

The goal is not to show more charts for their own sake. The goal is to translate your data into a decision you can actually use.

What data does BloomFit use?

With your permission, BloomFit reads selected data from Apple Health. Depending on what you choose to share and what your device supports, this may include:

Menstrual cycle records
Sleep
Heart rate
Heart rate variability (HRV)
Resting heart rate (RHR)
Respiratory rate (RR)
Blood oxygen saturation (SpO2)
Wrist or body temperature data
VO2 max
Workout and activity data

BloomFit uses this information to build a more personal picture of your training readiness. Your own baseline matters more than a generic population average.

If recent cycle data is missing from Apple Health, BloomFit may ask for a few basic details, such as your last period start date and usual cycle length, so the app can estimate your current phase more usefully.

Why cycle awareness matters

Many fitness tools treat the body as if training capacity is stable every day. BloomFit is built around a different assumption: for many women, energy, temperature, heart rate, perceived effort, and recovery can shift across the menstrual cycle.

That does not mean your cycle determines what you can or cannot do. It means cycle context can help explain why the same workout may feel easier one week and heavier another week. BloomFit uses that context to adjust recommendations instead of treating every change as a failure or a warning sign.

How AI Coach fits in

AI Coach is there to make your data easier to act on. You can ask why a metric changed, whether today's workout should be adjusted, or what to do if your body state and motivation do not match.

Before using AI Coach, BloomFit asks for explicit consent. If you do not agree, AI Coach is not activated.

Frequently Asked Questions

Do I need an Apple Watch? BloomFit works best when Apple Health has recent wearable data, especially overnight sleep, HRV, resting heart rate, respiratory rate, and temperature. Some features can still work with partial Apple Health data, but the most complete daily guidance requires consistent wearable data.

Does BloomFit write data back to Apple Health? BloomFit is designed around reading your authorized Apple Health data for personalized guidance. It does not need to write medical records back to Apple Health to explain your body state.

Is BloomFit a medical app? No. BloomFit provides general fitness, recovery, and lifestyle guidance. It does not diagnose, treat, prescribe, or replace care from a qualified medical professional.

Why do some metrics say there is not enough data? Some insights need a baseline. If you recently started using the app, changed devices, did not wear your watch overnight, or did not authorize a data category, BloomFit may wait for more data rather than guessing.

Things to note

BloomFit is most useful when you wear your device consistently, especially overnight.
Your baseline improves over time. Early readings may be less personal until enough of your own data is collected.
Cycle predictions are estimates. Irregular cycles, travel, illness, hormonal contraception, pregnancy, postpartum changes, and perimenopause can all affect patterns.
AI Coach should be treated as supportive guidance, not medical advice.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Recovery Score?

Think of Recovery as your body's morning readiness report — a single number between 0 and 100 that tells you how well you've bounced back from yesterday, and how much your body is ready to take on today. BloomFit refreshes Recovery once every morning, based on signals collected while you slept.

What each score range means

• 90-100: Fully recovered — feel free to take on high-intensity training.

• 70-89: Normal — proceed with your usual plan.

• 50-69: On the low side — reduce intensity or shorten your session.

• Below 50: Take it easy — focus on active rest.

How is Recovery Score calculated?

Recovery is a personalized score that compares today's body signals against your own 14-day baseline — not against a population average. Your baseline shifts as your fitness, sleep habits, and stress levels evolve, so Recovery always reflects what's normal for you.

Each morning, Recovery looks at seven contributors and combines them into a single score:

Heart rate variability (HRV) — the strongest signal of how recovered your nervous system is.
Resting heart rate — a marker for stress, illness, dehydration, or alcohol.
Last night's sleep — how long you slept.
Recent sleep balance — whether you've been building up a sleep debt or oversleeping.
Body temperature — an early signal for illness, calibrated to where you are in your cycle.
Yesterday's activity — was it a sweet spot, a rest day, or an overload?
Activity trend — is today's planned activity similar to your recent average?

Signals related to your nervous system and sleep carry the most weight, because they are the most direct measures of recovery. Less direct signals (activity, temperature, sleep balance) play a smaller, supporting role.

If you don't have data for one of the contributors on a given day, Recovery automatically rebalances around what is available — you won't get penalized for a missing signal.

Cycle-aware temperature

BloomFit's Recovery is designed with women's physiology in mind. If you're in the luteal phase of your cycle, Recovery automatically widens its expected temperature range. A small rise in body temperature is normal during this phase and shouldn't be misread as illness. Recovery uses Apple Health's cycle data to recognize this and adjust accordingly — so a normal luteal temperature rise won't lower your score.

Frequently Asked Questions

Why does Recovery sometimes show "Not enough data" instead of a score? Recovery is built on signals from your autonomic nervous system — specifically HRV and resting heart rate — combined with sleep. If both nervous system signals are missing, or you have no sleep data from last night, the score is hidden rather than estimated from less reliable signals. Wearing your Apple Watch overnight is the most reliable way to ensure a daily score.

Why is my Recovery score low even though I feel fine? Recovery often picks up on stress or strain before you consciously feel it. Common triggers include alcohol the night before, an unusually intense workout, illness in its early stages, or simply a poor night's sleep. One low day is rarely a concern — look at the trend across the week.

Can I check Recovery if I don't wear a watch overnight? Recovery depends on overnight measurements of HRV and resting heart rate, which require wearing a compatible device while you sleep. Without those signals, Recovery can't reliably measure your readiness.

What should I do with a low Recovery score? A low score isn't a verdict — it's a suggestion. Treat it as a cue to ease up, shorten a planned workout, or focus on lower-intensity movement. Pushing through isn't dangerous, but on most days, recovery improves more quickly when you listen.

Things to note

The first two weeks calibrate your baseline. During this period, Recovery uses general population reference values, then transitions to your personal baseline once enough of your own data is collected.
Caffeine, alcohol, illness, and emotional stress can show up in Recovery through their effects on HRV and resting heart rate. This is a context signal, not an error or diagnosis.
Recovery is a directional signal, not a medical diagnosis. Patterns over weeks tell you more than any single day's score.
Recovery and Energy are different views of the same body. Recovery looks back at your overnight readiness; Energy tracks how you're using and replenishing that reserve during the day.

References

Shaffer F, Ginsberg JP. An Overview of Heart Rate Variability Metrics and Norms. Frontiers in Public Health. 2017;5:258.
de Jager E, Caulfield B, Angelidi E, MacNamee B, Holden S. Wearable-Derived Heart Rate Variability Across the Menstrual Cycle, Hormonal Contraceptive Use, and Reproductive Life Stages in Females: A Living Systematic Review. Sports Medicine. 2026;56:1153-1173.
Doherty C, Baldwin M, Lambe R, Burke D, Altini M. Readiness, recovery, and strain: an evaluation of composite health scores in consumer wearables. Translational Exercise Biomedicine. 2025;2(2):128-144.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Body Energy Score?

Think of Body Energy as the battery indicator for your body — it starts the day charged up by how well you recovered last night, then drains as you go through the day's activity and waking hours. The only way to recharge is to sleep.

What each score range means

• 90-100: Fully charged — ready for high-intensity workouts or demanding tasks.

• 70-89: Doing well — proceed as planned.

• 50-69: Running low — choose lighter tasks.

• Below 50: Nearly drained — prioritize rest.

How is Body Energy Score calculated?

In BloomFit's model, Body Energy is single-directional during the day: it can only drop. Rest does not refill the score immediately; it slows the drain. A full recharge happens the next morning, when overnight recovery sets a new starting point.

Each time BloomFit refreshes Body Energy, it considers:

Your Recovery Score this morning — sets the day's maximum. If Recovery isn't available, Body Energy won't show either.
Activity intensity since you woke up — only moderate-to-high effort drains the battery. Walking, light chores, and rest don't cost any energy.
Hours since waking — even without activity, being awake itself causes a slow, steady decline.
Your menstrual cycle phase — during the luteal phase, the same workout costs slightly more energy, reflecting how the body actually feels at that time.

Cycle-aware energy use

BloomFit recognizes that the same workout can feel harder during the luteal phase of your cycle. To match that lived experience, Body Energy applies a modest extra drain to workouts during this phase. This means a luteal-phase afternoon may show a slightly lower Body Energy than a follicular-phase day with the same activity.

Frequently Asked Questions

Why doesn't my Body Energy ever go back up during the day? Body Energy is designed to count down only. Adding energy back without a sound physiological basis would create confusing fluctuations ("Why is my number going up?"). A monotonic decrease gives you a clearer mental model: rest stops the drain, sleep restores the full battery.

Why does Body Energy show "--" sometimes? Body Energy starts each day from your Recovery Score. If Recovery is unavailable (for example, you didn't wear your Apple Watch overnight), there's no starting point — so Body Energy won't show a number either. Make sure to wear your Apple Watch to bed for a complete daily picture.

Why does Body Energy feel lower during my luteal phase? It's by design. The luteal phase often comes with lower perceived energy, and similar workouts subjectively feel harder. BloomFit accounts for this rather than ignoring it, so the number on your screen better matches how you actually feel.

Why doesn't a nap recharge my Body Energy? Only nighttime sleep meaningfully restores recovery markers like heart rate variability and resting heart rate, which are the basis of Recovery Score. Naps stop the drain but don't reset the day's starting point.

Things to note

Body Energy depends on Recovery Score. Without a Recovery reading, there's no daily starting point and Body Energy won't show.
Light activity is "free." Daily routines like walking, cooking, or housework don't drain the battery. The drain starts at moderate-intensity effort or above.
Your maximum heart rate is estimated from your age. This lets us calculate effort intensity without requiring you to perform a maximal exercise test. As a result, very fit users may see slightly different drain than they expect at the same heart rate.
Body Energy and Recovery are paired views. Recovery looks back at the overnight; Body Energy tracks the day in real time.

References

Doherty C, Baldwin M, Lambe R, Burke D, Altini M. Readiness, recovery, and strain: an evaluation of composite health scores in consumer wearables. Translational Exercise Biomedicine. 2025;2(2):128-144.
Achten J, Jeukendrup AE. Heart rate monitoring: applications and limitations. Sports Medicine. 2003;33(7):517-538.
Schlie J, Krassowski V, Schmidt A. Effects of menstrual cycle phases on athletic performance and related physiological outcomes: a systematic review of studies using high methodological standards. Journal of Applied Physiology. 2025;139(3):650-667.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Sleep Score?

Think of Sleep Score as your nightly sleep report card — a single number between 0 and 100 that summarizes how restorative your sleep was, based on how much you slept, how well you stayed asleep, and the makeup of your sleep stages.

What each score range means

• 90-100: Excellent.

• 80-89: Good.

• 60-79: Average — room to improve.

• Below 60: Poor — your body may need a gentler day.

How is Sleep Score calculated?

Sleep Score combines five aspects of last night's sleep into one number:

Total sleep duration — the single most important factor. Roughly 8 hours receives the highest score; both too little and too much sleep lower the score.
Sleep efficiency — the share of time in bed that you were actually asleep. Frequent restlessness or long stretches of lying awake reduce this.
Deep sleep proportion — deep sleep supports physical repair, hormone release, and immune function. Sleep Score looks for a healthy range, not just "more."
REM sleep proportion — REM supports emotional regulation and long-term memory consolidation, again with a healthy range rather than a "higher is better" rule.
Restfulness — how brief the night's awakenings were in total. Frequent micro-awakenings lower this.

Sleep Score is built so that even iPhone-only users (without an Apple Watch) can get a score from total duration, efficiency, and restfulness alone. When deep and REM data aren't available, the remaining factors are reweighted automatically rather than penalizing you for missing data.

Frequently Asked Questions

Why does my Sleep Score go down if I sleep more than 8 hours? Both too little and too much sleep can be signs your body isn't in its best state. Oversleeping sometimes points to recovery from illness, accumulated sleep debt, or other underlying factors. The deduction is gentler than for sleeping too little, but it still appears in the score.

Why is my Sleep Score sometimes lower when I wear my Apple Watch? With the Apple Watch, BloomFit can see your sleep stages in detail (deep, REM, and time awake during the night). Without it, those finer-grained checks aren't applied, which can lead to a slightly higher score for the same night. Wearing your Apple Watch overnight gives the most accurate picture.

Why didn't I get a score this morning? Sleep Score requires at least your total sleep duration or sleep efficiency to be available. If neither was recorded — for example, the device didn't detect that you slept — you'll see "No sleep data" instead of a score.

What does each score range mean? 90–100 is excellent, 80–89 is good, 60–79 is average with room to improve, and below 60 suggests your body had a tough night and may need a lighter day.

Things to note

Sleep stage data quality depends on your device. Apple Watch gives the most detailed view; iPhone-only data is coarser but still useful.
A single low score is not a problem. Look at the weekly trend rather than any one night. Stress, late meals, alcohol, and travel all affect sleep short-term.
Recommended sleep duration is around 7–9 hours for adults. BloomFit centers the optimal range around this, in line with widely cited guidance.
Sleep Score and Recovery Score are related but different. Sleep Score reflects the quality of the night itself; Recovery Score reflects how ready your body is the next morning, which is influenced by sleep but also by HRV and resting heart rate.

References

Buysse DJ. Sleep health: can we define it? Does it matter? Sleep. 2014;37(1):9-17.
Ohayon M, Wickwire EM, Hirshkowitz M, et al. National Sleep Foundation's sleep quality recommendations: first report. Sleep Health. 2017;3(1):6-19.
Watson NF, Badr MS, Belenky G, et al. Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep. 2015;38(6):843-844.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Training Stress Balance (TSB)?

Think of Training Stress Balance as your training bank account — your long-term fitness builds up like savings, while recent hard sessions act like withdrawals. TSB tells you, day to day, whether you're flush with energy or running close to empty.

What each zone means

• High fatigue load: Fatigue appears to be outpacing fitness. Consider reducing volume or intensity and watching how you feel.

• Balanced: A healthy training load. Stay the course.

• Undertraining: Recent training is well below your normal level. Fitness may begin to drift down.

How is Training Stress Balance calculated?

TSB compares two views of your training:

Long-term fitness — a rolling average of your training load over roughly the past six weeks. This reflects the durable fitness you've built.
Short-term fatigue — a rolling average over the past week, capturing the tiredness that builds up from recent intensity.

When recent fatigue catches up to or exceeds your long-term fitness, TSB drops into a negative range and the app flags it as a sign to ease up. When recent training is below your typical level, TSB rises — and if it stays high too long, that's a signal your fitness is starting to drift down.

Each workout's contribution is estimated from its duration and heart rate, so you don't need a power meter. When heart rate isn't recorded for a session, BloomFit falls back to active energy or workout duration so that the workout still counts.

Frequently Asked Questions

Why does TSB show "Not enough data"? TSB needs enough training history to build a reliable long-term fitness baseline. If you've just started using BloomFit, or you've had fewer than a handful of workouts in the past six weeks, there isn't enough signal yet — so the app says so honestly rather than showing a misleading number.

Why doesn't my workout from this morning show up yet? Apple Watch sometimes takes hours to sync workout data to Apple Health. To avoid showing stale or wrong numbers, BloomFit always recalculates today's TSB from fresh data — so a delayed workout from earlier today will appear once Apple Health has it.

How does TSB handle rest days? A rest day counts as zero training, not as missing data. This way, the rolling averages reflect your real pattern, including planned recovery.

Will TSB work without an Apple Watch? Workouts logged in Apple Health from any source can contribute to TSB. The score is most accurate when heart rate is recorded during each session, but it gracefully degrades to use workout energy or duration when heart rate isn't available.

Things to note

TSB is for general fitness, not elite athletes. Serious cyclists or runners often use power-based training load; BloomFit uses heart rate-derived load, which is well suited to most people but less precise at the very top of the performance range.
Maximum heart rate is estimated from your age. BloomFit doesn't try to measure your peak heart rate directly. This trade-off keeps explanations simple and consistent — your TSB doesn't shift just because of a single sprint.
The "Undertraining" label is a heads-up, not a verdict. Planned rest weeks and recovery blocks will naturally land you here, and that's healthy.
TSB is a trend, not a daily reading. Day-to-day fluctuations are normal; what matters is the direction over a week or two.

References

Banister EW, Calvert TW, Savage MV, Bach T. A systems model of training for athletic performance. Australian Journal of Sports Medicine. 1975;7(3):57-61.
Borresen J, Lambert MI. The quantification of training load, the training response and the effect on performance. Sports Medicine. 2009;39(9):779-795.
Halson SL. Monitoring training load to understand fatigue in athletes. Sports Medicine. 2014;44(Suppl 2):S139-S147.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Menstrual Cycle Tracking?

Think of menstrual cycle tracking as the context layer for your training plan. It helps BloomFit understand where you may be in your cycle, so changes in energy, recovery, temperature, sleep, and perceived effort are interpreted with more care.

Your cycle does not decide your limits for you. It gives extra context so your training can be adjusted instead of judged.

What each phase generally means

Menstrual phase: Bleeding is happening. Some people feel lower energy, cramps, or heavier fatigue, while others feel fine with normal training.
Follicular phase: Estrogen tends to rise. Many people feel more energetic and more ready for strength, intervals, or skill work.
Ovulation window: Some people feel strong or powerful, while others notice no clear change. Evidence on performance and injury risk is mixed, so BloomFit treats this as a context cue rather than a rule for training.
Luteal phase: Progesterone is higher. Body temperature often rises, sleep may feel lighter, and the same workout may feel harder than usual.

These are patterns, not rules. BloomFit combines cycle phase with your actual signals, such as HRV, resting heart rate, sleep, temperature, and recent activity, before suggesting what to do today.

How does BloomFit estimate cycle phase?

BloomFit first looks for cycle data from Apple Health, such as period logs and related cycle records you have chosen to share. If recent data is missing, BloomFit may ask for basic information like your last period start date and usual cycle length.

From there, BloomFit estimates the current phase and uses it as one input in your daily interpretation. The estimate becomes more useful when your period logs are consistent over time.

How BloomFit uses cycle data

BloomFit uses cycle context in three main ways:

Training guidance: The app may suggest changing intensity, volume, or exercise type if your cycle phase and body signals point toward higher strain.
Energy interpretation: During the luteal phase, the same workout may cost slightly more Body Energy because effort can feel higher.
Temperature interpretation: A small temperature rise can be normal after ovulation and during the luteal phase, so BloomFit is careful not to treat every rise as illness.

The key idea is balance: cycle context can explain normal fluctuation, but it should not hide real warning signs. If temperature, resting heart rate, respiratory rate, and HRV all move in an unusual direction together, BloomFit will treat that as a stronger signal than cycle phase alone.

Frequently Asked Questions

Why does my cycle phase affect workout suggestions? Hormonal shifts can influence temperature, fluid balance, sleep, perceived effort, and recovery. BloomFit uses cycle phase to make training advice feel closer to how your body may actually respond that day.

Can I still train hard during my period or luteal phase? Often, yes. BloomFit does not assume you must stop training. It may suggest lower intensity, shorter duration, more warm-up, or a different workout style when your body signals point that way.

What if my cycle is irregular? Cycle estimates may be less certain. In that case, BloomFit leans more heavily on current body signals such as sleep, HRV, RHR, temperature, and recent activity.

Does BloomFit replace a period tracker or fertility app? No. BloomFit uses cycle information to support fitness guidance. It is not designed for contraception, fertility planning, diagnosis, or medical cycle management.

Things to note

A typical cycle can vary from person to person, and even your own cycle may change month to month.
Hormonal contraception, pregnancy, postpartum changes, perimenopause, illness, stress, travel, and sleep disruption can all change cycle-related patterns.
Cycle data is most useful when combined with your own baseline and recent body signals.
If you have severe pain, very heavy bleeding, unusual symptoms, or sudden cycle changes, consider speaking with a qualified medical professional.

References

Bull JR, Rowland SP, Scherwitzl EB, Scherwitzl R, Danielsson KG, Harper J. Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles. npj Digital Medicine. 2019;2:83.
Baker FC, Siboza F, Fuller A. Temperature regulation in women: Effects of the menstrual cycle. Temperature. 2020;7(3):226-262.
Schlie J, Krassowski V, Schmidt A. Effects of menstrual cycle phases on athletic performance and related physiological outcomes: a systematic review of studies using high methodological standards. Journal of Applied Physiology. 2025;139(3):650-667.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Heart Rate Variability (HRV)?

Heart Rate Variability, or HRV, measures the tiny changes in time between one heartbeat and the next. It is one of the most useful signals BloomFit uses to understand how recovered your nervous system may be.

In simple terms: HRV helps answer, "Is my body ready to handle stress today?"

What HRV can tell you

HRV is closely related to your autonomic nervous system, which helps regulate stress and recovery. When HRV is near or above your usual baseline, it often suggests your body is handling strain well. When HRV drops below your normal range, it may point to fatigue, poor sleep, alcohol, illness, emotional stress, or accumulated training load.

Higher is not always automatically better. What matters most is your own normal range and the trend over several days.

How BloomFit uses HRV

BloomFit compares today's HRV with your personal baseline rather than judging it against a generic ideal. HRV is one of the strongest contributors to Recovery Score because it reflects how your body responded overnight.

BloomFit may use HRV to:

Adjust Recovery Score
Explain why you may feel ready or flat today
Suggest whether to choose hard, moderate, light, or recovery-focused training
Help AI Coach answer questions about fatigue, stress, or readiness

If HRV is missing, BloomFit can still use other available signals, but Recovery may be less complete. If both HRV and resting heart rate are missing, BloomFit may hide Recovery rather than guessing from weaker signals.

Why HRV changes

HRV can move for many reasons:

Sleep quality and sleep duration
Alcohol or late meals
Emotional stress
Illness or early immune response
Dehydration
Hard training or accumulated training load
Menstrual cycle phase
Travel, jet lag, or schedule disruption

That is why one low HRV reading is not a verdict. It is a cue to look at the rest of the picture.

Frequently Asked Questions

What is a good HRV? There is no single good HRV number for everyone. Age, genetics, fitness level, measurement method, and device timing all matter. BloomFit focuses on your personal baseline.

Why is my HRV low even though I feel fine? HRV can react before you consciously feel tired or sick. It can also dip after a hard workout or a short night of sleep. If the rest of your signals look normal, one low reading is usually most useful as a reason to avoid max-effort work.

Why does my HRV look different across apps? Apps may use different time windows, formulas, and filtering methods. Apple Health data can also vary depending on when measurements were recorded. Compare trends within one app rather than mixing numbers across apps.

Can I improve HRV? Often, yes, but indirectly. Better sleep consistency, lower alcohol intake, smarter training load, hydration, stress management, and recovery days can all support healthier HRV patterns over time.

Things to note

HRV is most useful as a trend, not a single-day score.
A low HRV day does not mean you cannot train. It usually means you should be more thoughtful about intensity.
HRV should be interpreted with sleep, resting heart rate, temperature, respiratory rate, activity, and how you feel.
HRV is not a diagnosis of stress, illness, or hormone status.

References

Shaffer F, Ginsberg JP. An Overview of Heart Rate Variability Metrics and Norms. Frontiers in Public Health. 2017;5:258.
Kim H-G, Cheon E-J, Bai D-S, Lee YH, Koo B-H. Stress and Heart Rate Variability: A Meta-Analysis and Review of the Literature. Psychiatry Investigation. 2018;15(3):235-245.
de Jager E, Caulfield B, Angelidi E, MacNamee B, Holden S. Wearable-Derived Heart Rate Variability Across the Menstrual Cycle, Hormonal Contraceptive Use, and Reproductive Life Stages in Females: A Living Systematic Review. Sports Medicine. 2026;56:1153-1173.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Respiratory Rate (RR)?

Respiratory Rate, or RR, is the number of breaths you take per minute. In BloomFit, RR is mainly used as a context signal: it helps explain whether your overnight body state looks calm, strained, or different from your usual pattern.

In simple terms: RR helps answer, "Was my body breathing harder than usual while I slept?"

What RR can tell you

A typical resting adult respiratory rate is often described around 12 to 20 breaths per minute, depending on the source and measurement context. But for wearable data, your own baseline matters more than a single public range.

When RR is higher than your usual overnight pattern, it may be related to:

Illness or early immune response
Fever
Stress or anxiety
Alcohol
Hard training
Altitude
Sleep disruption
Respiratory irritation

When RR is lower than usual, it may simply reflect deep rest, but context still matters. BloomFit looks at RR together with HRV, RHR, temperature, SpO2, sleep, and how you feel.

How BloomFit uses RR

BloomFit may use respiratory rate to support AI Insight explanations and Details tab interpretation. RR can be especially helpful when several signals move together.

For example:

Higher RR plus higher RHR may suggest your body is under more strain than usual.
Higher RR plus higher temperature may be a reason to reduce training intensity.
Higher RR plus lower SpO2 may be worth watching more carefully, especially if you feel unwell.

RR does not need to change your whole plan by itself. It becomes more useful as part of a pattern.

Frequently Asked Questions

Why does BloomFit show RR mostly from overnight data? Overnight readings are more stable because you are not talking, walking, eating, or exercising. That makes trends easier to compare day to day.

Is a higher RR always bad? No. RR can rise for normal reasons, such as a hard workout, altitude, or a warm sleep environment. It becomes more meaningful when it stays elevated or appears with other unusual signals.

Can RR tell me if I am sick? No. RR can be one clue, but it cannot diagnose illness. If you feel unwell, reduce intensity and consider seeking medical advice.

Why is RR missing? RR depends on device support, sleep tracking, Apple Health permissions, and whether your watch captured usable overnight data.

Things to note

RR is a support signal, not a standalone readiness score.
Compare RR with your own baseline rather than one fixed ideal number.
Watch fit, sleep tracking setup, and missing overnight data can affect availability.
Seek medical help promptly if breathing feels difficult, unusual, or concerning.

References

Nicolò A, Massaroni C, Schena E, Sacchetti M. The Importance of Respiratory Rate Monitoring: From Healthcare to Sport and Exercise. Sensors. 2020;20(21):6396.
MedlinePlus Medical Encyclopedia. Vital signs.
Apple Support. Track your overnight vitals with Apple Watch.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Resting Heart Rate (RHR)?

Resting Heart Rate, or RHR, is the number of times your heart beats per minute while your body is at rest. In BloomFit, it is one of the core signals for understanding recovery, stress, and how hard your body may be working in the background.

In simple terms: RHR helps answer, "Is my body more strained than usual today?"

What RHR can tell you

For many adults, a resting heart rate between about 60 and 100 beats per minute is commonly described as normal. Some well-trained people may sit below that range without a problem. BloomFit does not treat a population range as your personal target. It compares your current RHR with your own baseline.

When RHR is higher than usual, it may reflect:

Poor sleep
Stress
Dehydration
Alcohol
Illness or fever
Heavy training load
Heat, travel, or schedule disruption
Menstrual cycle-related changes

When RHR is lower than usual, it can reflect improved fitness or deep rest. But unusually low readings with dizziness, faintness, chest discomfort, or shortness of breath should not be ignored.

How BloomFit uses RHR

BloomFit uses RHR as a key contributor to Recovery Score. If your RHR is close to your normal range, it supports a higher recovery reading. If it is elevated compared with your baseline, BloomFit may lower Recovery and suggest a lighter training day.

RHR is especially useful when paired with HRV:

Lower HRV plus higher RHR often points to fatigue or strain.
Normal HRV plus slightly higher RHR may suggest mild stress, heat, dehydration, or cycle-related change.
Higher RHR plus higher temperature or respiratory rate may deserve extra caution.

BloomFit looks for patterns rather than treating any single number as a verdict.

Frequently Asked Questions

Why did my RHR go up overnight? Common reasons include poor sleep, alcohol, dehydration, a hard workout, stress, illness, or sleeping in a warmer environment. Cycle phase can also shift heart rate for some people.

Does a lower RHR always mean better fitness? Not always. A lower RHR can be a sign of fitness, but it can also be affected by medication, measurement timing, or other factors. BloomFit focuses on what is normal for you.

Can I train if my RHR is higher than usual? Often, yes, but consider lowering intensity if RHR is high along with low HRV, poor sleep, high temperature, or feeling unwell.

Why does my RHR differ from my workout heart rate? RHR is measured when you are resting. Workout heart rate reflects exercise intensity and changes quickly with movement, heat, hydration, and effort.

Things to note

RHR is most meaningful when measured consistently, especially overnight or at rest.
A single high reading can happen for ordinary reasons. Repeated changes are more useful.
RHR should be interpreted with HRV, sleep, temperature, respiratory rate, activity, and symptoms.
BloomFit uses RHR for wellness and training guidance, not diagnosis.

References

Quer G, Gouda P, Galarnyk M, Topol EJ, Steinhubl SR. Inter- and intraindividual variability in daily resting heart rate and its associations with age, sex, sleep, BMI, and time of year: Retrospective, longitudinal cohort study of 92,457 adults. PLOS One. 2020;15(2):e0227709.
Buchheit M. Monitoring training status with HR measures: do all roads lead to Rome? Frontiers in Physiology. 2014;5:73.
Apple Support. Monitor your heart rate with Apple Watch.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Blood Oxygen (SpO2)?

Blood Oxygen, or SpO2, estimates the percentage of oxygen carried by your red blood cells. In BloomFit, SpO2 is used as a wellness context signal, especially when looking at overnight trends alongside respiratory rate, heart rate, temperature, and sleep.

In simple terms: SpO2 helps answer, "Did my overnight oxygen pattern look normal for me?"

What SpO2 can tell you

Many consumer health sources describe normal oxygen saturation as roughly 95-100% for healthy people at sea level, but wearable readings can vary by device, fit, skin perfusion, movement, altitude, and measurement conditions. BloomFit treats SpO2 as context, not as a medical measurement.

SpO2 may be lower or more variable because of:

Higher altitude
Poor watch fit or movement
Cold hands or reduced circulation
Sleep disruption
Respiratory irritation
Illness
Breathing changes during sleep

One unusual reading is not enough to explain your health. A repeated pattern, especially with symptoms or other metrics moving in the same direction, deserves more attention.

How BloomFit uses SpO2

BloomFit may show SpO2 in the Details tab and use it in AI Insight explanations when available. SpO2 is most useful when paired with other signals:

Lower SpO2 plus higher RR may suggest your body worked harder overnight.
Lower SpO2 plus poor sleep may help explain low energy the next day.
Lower SpO2 plus feeling short of breath, dizzy, or unwell should be taken seriously.

Because SpO2 availability depends on device model, region, Apple Health permissions, and reliable measurements, BloomFit does not assume every user will have this metric.

Frequently Asked Questions

Is Apple Watch SpO2 medical-grade? Apple states that Blood Oxygen app measurements are not intended for medical use and are designed for general fitness and wellness. BloomFit follows that same boundary.

Why did I get one low SpO2 reading? Watch position, loose fit, movement, cold skin, or sleeping posture can affect readings. Look for repeated trends rather than reacting to a single number.

Should I train if SpO2 looks low? If SpO2 is unusually low for you and you also feel unwell, short of breath, dizzy, or unusually fatigued, choose rest and consider medical advice. If you feel normal and other signals look normal, check the trend and device fit.

Why is SpO2 missing in BloomFit? Blood oxygen data may not be available on every Apple Watch model, in every region, or for every overnight session. It also requires Apple Health permission.

Things to note

SpO2 is a wellness context signal in BloomFit, not a diagnosis.
Altitude can lower oxygen saturation even when you are healthy.
Wearable SpO2 can be affected by fit and measurement quality.
Persistent low readings or breathing symptoms should be discussed with a qualified medical professional.

References

Apple Support. How to use the Blood Oxygen app on Apple Watch.
U.S. Food and Drug Administration. Pulse Oximeter Basics.
World Health Organization. Pulse Oximetry Training Manual.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.

What is Wrist Temperature?

Wrist Temperature is an overnight temperature trend measured from your wrist while you sleep. It is not the same as taking your temperature with a thermometer. In BloomFit, it helps explain changes in recovery, cycle phase, sleep, and body strain.

In simple terms: wrist temperature helps answer, "Was my overnight temperature different from my usual pattern?"

What wrist temperature can tell you

Wrist temperature is most useful as a change from your personal baseline. It can shift because of:

Menstrual cycle phase
Illness or early immune response
Alcohol
Late meals
Sleep environment
Travel
Exercise
Watch fit or measurement conditions

During the luteal phase, after ovulation, body temperature often rises compared with the follicular phase. BloomFit is designed to recognize that a small cycle-related rise can be normal, so it does not automatically treat every rise as a negative signal.

How BloomFit uses wrist temperature

BloomFit may use temperature as a supporting contributor in Recovery and AI Insight explanations. It is especially useful when interpreted with cycle phase.

For example:

A small temperature rise during the luteal phase may be expected.
A temperature rise with higher RHR, higher RR, or lower HRV may suggest your body is under extra strain.
A temperature change with poor sleep may help explain lower Body Energy.

Temperature is not the strongest recovery signal by itself. It becomes more helpful when it confirms what other metrics are already suggesting.

Frequently Asked Questions

Is wrist temperature the same as body temperature? No. Apple describes wrist temperature as a measurement related to body temperature, taken while you sleep. It is shown as a change from your baseline and is not an on-demand thermometer.

Why does my temperature rise before my period? After ovulation, progesterone rises and core body temperature often increases in the luteal phase. BloomFit accounts for this so normal cycle-related temperature changes are not overread.

Can temperature tell me if I am sick? No. Temperature can be one clue, but BloomFit does not diagnose illness. If you feel unwell or have symptoms, reduce intensity and consider medical advice.

Why is temperature missing? Wrist temperature requires a compatible Apple Watch, sleep tracking setup, Sleep Focus, enough nights to establish a baseline, and Apple Health permission.

Things to note

Wrist temperature is a trend metric, not a thermometer.
It usually needs several nights of data before it becomes useful.
Cycle phase, sleep environment, alcohol, illness, and device fit can all affect readings.
BloomFit uses temperature for general fitness and wellness guidance, not medical diagnosis.

References

Apple Support. Track your nightly wrist temperature changes with Apple Watch.
Baker FC, Siboza F, Fuller A. Temperature regulation in women: Effects of the menstrual cycle. Temperature. 2020;7(3):226-262.
Shilaih M, Goodale BM, Falco L, Kübler F, De Clerck V, Leeners B. Modern fertility awareness methods: wrist wearables capture the changes in temperature associated with the menstrual cycle. Bioscience Reports. 2018;38(6):BSR20171279.

This content is for health education only and is not intended as medical diagnosis or treatment. If you experience any discomfort, please consult a qualified medical professional.