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Most HRV (Heart Rate Variability) apps are overly complicated. This one simply measures RMSSD (root mean square of successive differences), the most important and widely used metric, and presents the data in a simple, easy to understand fashion. Warning: This app is only intended for educational and informational purposes only and is NOT intended for the diagnosis, cure, mitigation, prevention, or treatment of any disease or medical condition. # Features * Measures RMSSD in a 5 minute test, with time remaining display * Vibration alert signals the test completion * Real-time heart rate display (average HR shown at the end of the test) * Minimum, average, and maximum beat interval [ms] display * Beat interval distribution graph display. This can be used to check the quality of the measurement. Assuming you do not have any heart abnormalities, the beat interval distribution graph at the end of the test should ideally be a bell curve normal distribution shape. If it is not, it may indicate that you moved during the test or were mentally interrupted or stressed suddenly during the test. In these cases, you should repeat the test. # FULL Version Features * Configurable measurement duration * Real time update of min, average, and max beat interval display during the test * Real time update of beat interval distribution graph during the test * Historical plot of RMSSD (white points and lines) (up to 60 days, assuming one test per day) * 7 day moving average trend plot of RMSSD (green line) * Saves the HRV result to the activity session record in Garmin Connect. # Instructions 1. Pick a time of day when you are most free from physical and mental stressors. (Ideally you should do the test at the same time of the day each time to be able to interpret historical trends. For most people this is just after you wake up in the morning, before eating, exercise, checking your phone, etc.) 2. Ensure that your watch is worn snugly over your wrist. 3. In a seated restful position, start the app and press the [Start] button. 4. Rest and breathe normally until the end of the test, signaled by a vibration from the watch. 5. View the results. 6. In the FULL version, press the [DOWN] button (or on touchscreen models, tap the screen) to see the historical trend graph. 7. In the FULL version, when viewing the historical trend graph, press the [UP] button (or on touchscreen models, tap the screen) to return to the initial test screen. 8. You can press the [START] button to repeat the test. # NOTES 1. HRV varies depending on multiple factors including age, stress, respiration, physical fitness, heredity etc. As physical fitness is improved, HRV tends to increase. Low HRV can indicate poor vagal tone, meaning that the body is less adaptable to physical and mental stressors that it may encounter. 2. For an explanation on why the first thing in the morning is the best time to do the measurement, see: https://medium.com/@marco_alt/the-ultimate-guide-to-heart-rate-variability-hrv-part-1-70a0a392fff4 3. For an excellent description on interpreting the results, see: https://medium.com/@marco_alt/the-ultimate-guide-to-heart-rate-variability-hrv-part-2-323a38213fbc and also: https://medium.com/@marco_alt/the-ultimate-guide-to-heart-rate-variability-hrv-part-3-5fe902f3d2b3 4. Because of the multiple factors that influence HRV, most importantly being the state of your mind and body and what is going on at the time, the results of a single measurement can be difficult to interpret, but becomes easier when many measurements are collected over longer periods to be able to identify trends and causes. See the links above for more detail. # Payment Please make sure the free version works before attempting to buy the full version. For the FULL version, use this link to pay US$1.50 via Stripe (no account required; credit card, Apple Pay, Google Pay accepted). https://buy.stripe.com/dR64hVbIo3cxaIM4ju 如需通过微信或支付宝付款，请使用此链接：https://buy.stripe.com/5kA29N8wc14p6sw7w

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Version 0.8.0 Updated SDK. Added diagnostics. Version 0.7.3 Added support for the D2 Mach 2. Version 0.7.2 Added support for Venu 4 models. Version 0.7.1 Added support for the Fenix 8 Pro. Version 0.7.0 Attempt to fix crash problems. Added support for the Venu X1. Version 0.6.0 FULL Version only change: Prevented crash on startup on some models. Added setting to enable/disable saving of HRV results to Garmin Connect. Changed activity type for the Garmin Connect record to Generic Sport. Version 0.5.0 FULL Version only change: Saves HRV result to the activity session record in Garmin Connect. Version 0.2.6 Added support for Forerunner 570/970 models. Version 0.2.5 Added support for the Vivoactive 6. Version 0.2.4 Added support for the Descent G2. Version 0.2.3 Added support for the Approach S50/S44. Version 0.2.2 Added support for the Instinct 3 models. Version 0.2.1 Added support for the Enduro 3 and Fenix 8 series. Version 0.2.0 Attempt to fix crash occuring on some models. Version 0.1.7 Added support for Forerunner 165 models. Version 0.1.6 Added support for the Descent Mk3 43mm models. Version 0.1.5 Added support for Fenix 7 Pro Solar. Version 0.1.4 Added support for the Descent Mk3 model. Version 0.1.3 Added support for Fenix 7X Pro Solar. Version 0.1.2 Added support for Vivoactive 5. Version 0.1.1 Added support for Venu 3 series.

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Approach® S50 Approach® S62 Approach® S62 Approach® S70 (42mm) Approach® S70 (47mm) Captain Marvel Captain Marvel D2™ Air D2™ Air X10 D2™ Air X15 D2™ Charlie D2™ Delta D2™ Delta PX D2™ Delta PX D2™ Delta S D2™ Mach 1 D2™ Mach 1 Pro D2™ Mach 2 D2™ Mach 2 Pro Darth Vader™ Darth Vader™ Descent™ G1 Descent™ G1 Descent™ G2 Descent™ Mk1 Descent™ Mk1 Descent™ MK2 Descent™ MK2 Descent™ Mk2S Descent™ Mk2S Descent™ MK3 - 43mm Descent™ MK3i - 51mm Enduro™ Enduro™ Enduro™ 2 Enduro™ 3 epix™ (Gen 2) epix™ (Gen 2) epix™ Pro (42mm) epix™ Pro (47mm) epix™ Pro (51mm) fēnix® 5 fēnix® 5 fēnix® 5 Plus fēnix® 5 Plus fēnix® 5S fēnix® 5S fēnix® 5S Plus fēnix® 5S Plus fēnix® 5X fēnix® 5X fēnix® 5X Plus fēnix® 5X Plus fēnix® 6 fēnix® 6 fēnix® 6 Dual Power fēnix® 6 Pro fēnix® 6 Pro fēnix® 6 Pro Dual Power fēnix® 6 Pro Solar fēnix® 6 Solar fēnix® 6S fēnix® 6S fēnix® 6S Dual Power fēnix® 6S Pro fēnix® 6S Pro fēnix® 6S Pro Dual Power fēnix® 6S Pro Solar fēnix® 6S Solar fēnix® 6X Pro fēnix® 6X Pro fēnix® 7 fēnix® 7 fēnix® 7 Pro fēnix® 7 Pro – Solar Edition (No Wi-Fi®) fēnix® 7S fēnix® 7S fēnix® 7S Pro fēnix® 7X fēnix® 7X fēnix® 7X Pro fēnix® 7X Pro No Wi-Fi fēnix® 8 AMOLED (43mm) fēnix® 8 AMOLED (47mm/51mm) fēnix® 8 Pro fēnix® 8 Solar (47mm) fēnix® 8 Solar (51mm) fenix® 9 - 43 mm fenix® 9 – 47 mm fenix® 9 Pro - 43 mm fenix® 9 Pro - 47 mm fenix® 9 Pro - 51 mm fenix® 9 Pro - Solar 47 mm fenix® 9 Pro - Solar 51 mm fēnix® Chronos fēnix® Chronos fēnix® E First Avenger First Avenger ForeAthlete 245 ForeAthlete 245 Music ForeAthlete 55 ForeAthlete 645 ForeAthlete 645 Music ForeAthlete 745 ForeAthlete 935 Forerunner® 165 Forerunner® 165 Music Forerunner® 170 Forerunner® 170 Music Forerunner® 245 Forerunner® 245 Forerunner® 245 Music Forerunner® 245 Music Forerunner® 255 Forerunner® 255 Music Forerunner® 255S Forerunner® 255S Music Forerunner® 265 Forerunner® 265S Forerunner® 55 Forerunner® 55 Forerunner® 570 - 42mm Forerunner® 570 - 47mm Forerunner® 645 Forerunner® 645 Music Forerunner® 70 Forerunner® 70 Forerunner® 745 Forerunner® 935 Forerunner® 945 Forerunner® 945 Forerunner® 945 LTE Forerunner® 955 Dual Power Forerunner® 965 Forerunner® 970 Instinct® 2 Instinct® 2 Instinct® 2S Instinct® 2S Instinct® 2X Instinct® 3 – 45 mm, AMOLED Instinct® 3 – 45 mm, Solar Instinct® 3 – 50 mm, AMOLED Instinct® 3 – 50 mm, Solar Instinct® Crossover Instinct® E – 40 mm Instinct® E – 45 mm MARQ® (Gen 2) MARQ® Adventurer (Gen 3) MARQ® Commander (Gen 2) – Carbon Edition MARQ™ Adventurer MARQ™ Adventurer MARQ™ Athlete MARQ™ Athlete MARQ™ Aviator MARQ™ Aviator MARQ™ Aviator (Gen 2) MARQ™ Captain MARQ™ Captain MARQ™ Commander MARQ™ Commander MARQ™ Driver MARQ™ Driver MARQ™ Expedition MARQ™ Expedition MARQ™ Golfer MARQ™ Golfer Mercedes-Benz Venu® Mercedes-Benz Venu® Mercedes-Benz Venu® 2 Mercedes-Benz Venu® 2 Mercedes-Benz Venu® 2S Mercedes-Benz Venu® 2S quatix® 6 quatix® 6X Rey™ Rey™ tactix® 7 tactix® 7 – AMOLED Edition tactix® 8 – 47 mm, AMOLED tactix® 8 – 51 mm, Solar Venu® Venu® Venu® 2 Venu® 2 Venu® 2 Plus Venu® 2 Plus Venu® 2S Venu® 2S Venu® 3 Venu® 3S Venu® 4 – 41 mm Venu® 4 – 45 mm Venu® Sq. Venu® Sq. Venu® Sq. Venu® Sq. Venu® Sq. 2 Venu® Sq. 2 Music Venu® Sq. Music Venu® Sq. Music Venu® Sq. Music Venu® Sq. Music Venu® X1 vívoactive® 3 vívoactive® 3 vívoactive® 3 vívoactive® 3 Mercedes-Benz® Collection vívoactive® 3 Mercedes-Benz® Collection vívoactive® 3 Music vívoactive® 3 Music vívoactive® 3 Music vívoactive® 4 vívoactive® 4 vívoactive® 4S vívoactive® 4S vívoactive® 5 vívoactive® 6

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2026-10-27 → 2026-11-04