Name: Simple HRV
Rating: 3 (22 reviews)
Author: Trudelta

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. (The activity is saved as a "Meditation" activity)

# 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

# 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

Alternative payment via Paypal: https://www.paypal.com/paypalme/trudelta/1.50USD

Simple HRV

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

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.
Для пользователей в России, пожалуйста, перейдите по этой ссылке для способа оплаты: https://boosty.to/trudelta

# 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

Alternative payment via Paypal: https://www.paypal.com/paypalme/trudelta/1.50USD

多くのHRV（心拍数の変動）は複雑すぎる。このアプリはRMSSD (連続する差分の二乗平均平方根)、一番重要で、多く使われている測定を測定し、データを分かりやすくように表示する。

# 機能
* ５分間のテストで、RMSSDを測定する。（テスト中に残り事案を表示する）
* テスト終了の時バイブレーションで通知する
* リアルタイムの心拍数の表示（テスト終了した後平均の心拍数を表示する）
* 最低、平均、最高の拍間隔 [ミリ秒] の表示 
* 拍間隔の分布グラフの表示。これによって、測定の測定の品質を確認できる。心臓の異常がないとしたら、テスト終了後に拍間隔の分布グラフは理想的に釣鐘曲線の正規分布形状になると期待する。そうではない場合はテスト中に動いたか、急に精神的に中断またはストレスを受けていたと考えられる。この場合は測定をやり直した方がよい。

# フル（有料版）の機能
* 測定期間を設定可能
* テスト中に最低、平均、最高の拍間隔のリアルタイムの更新
* テスト中に拍間隔の分布グラフのリアルタイムの更新
* RMSSDの歴史のグラフ（白い点と線）(１日あたり１つのテストすると最長60日間) 
* 7日間のRMSSDの移動平均の傾向グラフ（緑線）
* ガーミンConnectにHRVを保存する

# 使い方
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.

# 備考
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.

# お支払い・寄付
Please make sure the free version works before attempting to buy the full version.
プロ版をご購入する場合は、次のリンクで、米ドル$1.50をご送金して下さい (アカウント不要、クレジットカード、Google Pay、Apple Pay可能。https://buy.stripe.com/dR64hVbIo3cxaIM4ju

PayPalのお支払いはこのリンクをご利用下さい：https://www.paypal.com/paypalme/trudelta/1.50USD
重要：どのアプリをご購入するか、お支払いの時に備考を入力してください。