e.g. mhealth
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From the nonparametric method, we calculated the cross-daily stability (inter-daily stability, measuring the consistency of circadian sleep/wake activity rhythms across days); rhythm strength (relative amplitude, measuring the standardized peak-trough difference of 24-hour activity rhythms); and sleep/wake rhythm fragmentation (intradaily variability or IV, measuring the frequency and extent of transitions in activity levels).
JMIR Aging 2025;8:e67294
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Similarly, the misconception that one can “catch up” on lost sleep during weekends can lead to erratic sleep patterns that disrupt the body’s natural circadian rhythm and other biological rhythms, exacerbating sleep problems. Low sleep efficiency can be negatively impacted by the myth that “lying in bed with your eyes closed is almost as good as sleeping.”
JMIR Infodemiology 2024;4:e57748
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The patterns over 24 hours of accelerometry and heart rate measurements collected continuously (epochs defined through user settings ranging from hourly to continuously during workouts) through the smartwatch will be analyzed to retrieve relevant circadian (ie, of approximately 1 day) physiology parameters through cosinor, nonparametric, and hidden Markov model methods [37-40].
JMIR Res Protoc 2024;13:e52957
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Patients with major depression exhibit various circadian rhythmic abnormalities. These include day-to-day instability, drifting of the sleep-wake cycle [1-3], diurnal change in mood [4], alteration in cortisol rhythm [5], and changes in the circadian pattern of gene expression and metabolism in the brain [6,7]. Furthermore, mood symptoms are closely linked to the timing of sleep, and sleep delay often causes mood deterioration and sleep phase advancement, generating an antidepressant effect [1,8,9].
JMIR Ment Health 2023;10:e50072
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Since the behaviors are daily and repetitive, we use the term “circadian EMA” (c EMA) and label all similar apps as a particular c EMA app. In general, all EMA apps address circadian problems: For example, how does a participant’s mood change over multiple days [15] and how much exercise has a participant been getting and does that correlate with sleep [16]?
JMIR Form Res 2021;5(7):e26297
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