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  2. Apple Watch - Wikipedia

    en.wikipedia.org/wiki/Apple_Watch

    The back of all Apple Watches are equipped with a Heart Rate Monitor, which projects infrared and green light from light-emitting diodes (LEDs) onto the user's skin and photodiodes measure the varying amount of light reflected. Because blood absorbs green light and reflects red light, the amounts of each type of reflected light are compared to ...

  3. Fitness (Apple) - Wikipedia

    en.wikipedia.org/wiki/Fitness_(Apple)

    All workouts recorded through the Workouts app on the Apple Watch are viewable through the 'Summary' tab of the Fitness app and include relevant metrics and HealthKit data, such as heart rate, depending on the type of exercise. For outdoor activities, summaries also include weather conditions at the time of the workout and a map that outlines ...

  4. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    In a normal heart, the heart rate is the rate at which the sinoatrial node depolarizes since it is the source of depolarization of the heart. Heart rate, like other vital signs such as blood pressure and respiratory rate, change with age. In adults, a normal heart rate is between 60 and 100 bpm (normocardic), whereas it is higher in children. [56]

  5. Woman shares results after Apple Watch tracks her heart rate ...

    www.aol.com/woman-shares-results-apple-watch...

    According to the Apple Watch data, her heart rate went up to 88 BPM due to an “intense gym session” earlier in the day. Their breakup conversation occurred at 4pm and lasted for about an hour ...

  6. Pulse watch - Wikipedia

    en.wikipedia.org/wiki/Pulse_Watch

    There are also devices which use similar technologies to monitor heart rate from the ear, forearm and chest, using a chest strap. [2] All of which still use similar mechanisms to provide unobstructed biometric data for individuals. One study compared the use of a pulse watch device and a forearm device in detecting heart rate during physical ...

  7. Here's the 411 on All the Different Meanings for Heart Emojis

    www.aol.com/lifestyle/heres-411-different...

    Heart With Arrow. Thanks to its association with the Roman god Cupid, who shot mortals with arrows to make them fall in love, a heart pierced in such a way symbolizes romantic devotion.

  8. List of typographical symbols and punctuation marks

    en.wikipedia.org/wiki/List_of_typographical...

    Astronomical symbolsSymbols in astronomy; Chemical symbol – Abbreviations used in chemistry; Chinese punctuation – Punctuation used with Chinese characters; Currency symbolSymbol used to represent a monetary currency's name; Diacritic – Modifier mark added to a letter (accent marks etc.)

  9. Heart rate monitor - Wikipedia

    en.wikipedia.org/wiki/Heart_rate_monitor

    A heart rate monitor (HRM) is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study. It is largely used to gather heart rate data while performing various types of physical exercise. Measuring electrical heart information is referred to as electrocardiography (ECG or EKG).