Physiological Data

Electrodermal activity

_moodmetric/nuanic-ElectrodermalAct.tsv

This file contains electrodermal activity data recorded by the Moodmetric Ring that participants wear during the pre-scan period. We extract the data from the devices’ cloud service. The data covers the 24 hours preceding MRI acquisition. The sampling interval is ~60 seconds.

id

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed as date, time, and timezone in ISO 8601 format.

device

Device used to measure electrodermal activity (Moodmetric or Nuanic).

edaIndex

Electrodermal activity index: Moodmetric index (0-100) for Moodmetric, or DNE for Nuanic. The DNE is intended to describe the activation of the sympathetic nervous system on a scale from 1 to 100.

srl_scl

Skin conductance level (SCL) for Moodmetric, and skin resistance level (SRL) for Nuanic.

scr

Skin conductance response - skin reactions per minute. This integer typically variates between 0-20.

Energy burned

_appleHealth-ActiveEnergyBurned.tsv

This file contains data on the amount of active energy burned by the participant. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Amount of active energy the participant has burned in kcal.

_appleHealth-BasalEnergyBurned.tsv

This file contains data on the amount of resting energy burned by the participant. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Amount of resting energy the participant has burned in kilocalories (kcal).

Heart Rate

_appleHealth-HeartRate.tsv

This file contains data on the heart rate of the participant. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Heart rate in count/minute.

_appleHealth-HeartRateVariabilitySDNN.tsv

This file contains data on the heart rate variability of the participant. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Standard deviation of heartbeat intervals in milliseconds (ms).

_appleHealth-RestingHeartRate.tsv

This file contains data on the resting heart rate of the participant. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Resting heart rate in count/minute.

Physical activity

_appleHealth-AppleExerciseTime.tsv

This file contains data on the amount of time the participant has spent exercising. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Amount of time the participant has spent exercising in minutes. Movements that equal or exceed the intensity of a brist walk count as exercise time.

_appleHealth-AppleStandHour.tsv

This file contains data on the number of hours during which the participant has stood and moved for at least one minute per hour. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

HKCategoryValueAppleStandHourStood = The participant stood up and moved for at least one continuous minute during the sample.

HKCategoryValueAppleStandHourIdle = The participant didn’t stand up and move for at least one continuous minute during the sample.

_appleHealth-AppleStandTime.tsv

This file contains data on the amount of time the participant has spent standing. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Amount of time the participant has spent standing in minutes.

_appleHealth-DistanceWalkingRunning.tsv

This file contains data on the distance the participant has moved by walking or running. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Distance the participant has moved by walking or running in kilometers.

_appleHealth-FlightsClimbed.tsv

This file contains data on the number of flights of stairs the participant has climbed. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Number of flights of stairs the participant has climbed.

_appleHealth-StairAscentSpeed.tsv

This file contains data on the participant’s speed while climbing a flight of stairs. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Participant’s speed while climbing a flight of stairs in meters/second.

_appleHealth-StairDescentSpeed.tsv

This file contains data on the participant’s speed while descending a flight of stairs. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Participant’s speed while descending a flight of stairs in meters/second.

_appleHealth-StepCount.tsv

This file contains data on the number of steps the participant has taken. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

Number of steps.

Sleep

_applePillow-Sleep.tsv

This file contains data on the participants’ sleep. The data is recorded by the Pillow app installed on the Apple Watch that participants wear during the pre-scan period. We extract the data from the Pillow app. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

startTime

The start time of the recording in ISO 8601 timestamp format including timezone.

endTime

The end time of the recording in ISO 8601 timestamp format including timezone.

usedAppleWatch

A boolean value indicating if the session was recorded by the Apple Watch (True or False).

sessionIsNap

A boolean value indicating if this session was a nap (True or False).

timeToSleep

The time (in seconds) it took the participant to fall asleep.

timeAwake

The time (in seconds) the participant spent awake after initially falling asleep.

timeInLightSleep

The time (in seconds) the participant spent in light sleep.

timeInREMSleep

The time (in seconds) the participant spent in REM sleep.

timeInDeepSleep

The time (in seconds) the participant spent in deep sleep.

timeAwakeUntilStopping

This is the time the participant spent awake after the app registered the sleep as “ended”, until the tracking is stopped automatically.

numberOfAwakenings

The total count of times the participant woke up during the night.

sleepQuality

A calculated measure of the overall quality of the participants’ sleep, represented as a normalized score between 0 (poor quality) and 1 (good quality).

_applePillow-SleepStage.tsv

This file contains data on the sleep stages during the participants’ sleep. The data is recorded by the Pillow app installed on the Apple Watch that participants wear during the pre-scan period. We extract the data from the Pillow app. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

timestamp

Timestamp of the data point displayed as date, time, and timezone in ISO 8601 format.

stage

This column indicates the sleep stage starting or ending at the indicated timestamp.

0 = Deep sleep

1 = Light sleep

2 = REM

3 = Awake

_appleHealth-SleepAnalysis.tsv

This file contains data on the participants’ sleep. The data is recorded by the Apple Watch that participants wear during the pre-scan period. We extract the data from the Health app installed on the study phone that is connected to the Apple Watch. The data covers the 24 hours preceding MRI acquisition.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

The name of the Apple Device used to generate the reading. In this case, device names that begin with “IW” indicate an Apple Watch, whereas those that begin with “IP” refer to an iPhone.

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

HKCategoryValueSleepAnalysisAwake = Participant was awake.

HKCategoryValueSleepAnalysisInBed = Participant was in bed

HKCategoryValueSleepAnalysisAsleep = Participant was asleep.

HKCategoryValueSleepAnalysisAsleepCore = Participant was in light or intermediate sleep.

HKCategoryValueSleepAnalysisAsleepDeep = Participant was in deep sleep.

HKCategoryValueSleepAnalysisAsleepREM = Participant was in REM sleep.

HKCategoryValueSleepAnalysisAsleepUnspecified = Participant was asleep, but the specific stage isn’t known.

Menstrual cycle

_appleHealth-MenstrualFlow.tsv

This file contains data on the menstrual flow of female participants. Participants enter this data manually in the Health app installed on the study phone.

id

ID of the subject.

sessionNo

This is the session number.

sourceName

Health or Cycle Tracking

sourceVersion

The version of iOS or WatchOS on the device used to generate the reading.

startDate

The start date of the recording in ISO 8601 timestamp format including timezone.

endDate

The end date of the recording in ISO 8601 timestamp format including timezone.

value

HKCategoryValueMenstrualFlowUnspecified = Unspecified menstrual flow

HKCategoryValueMenstrualFlowLight = Light menstrual flow

HKCategoryValueMenstrualFlowMedium = Medium menstrual flow

HKCategoryValueMenstrualFlowHeavy = Heavy menstrual flow

HKCategoryValueMenstrualFlowNone = No menstrual flow