Actimetry-Derived 24 h Rest–Activity Rhythm Indices Applied to Predict MCTQ and PSQI

Abstract

The aim of this study was to identify wrist actimetry-based indices associated with the sleep–wake rhythm characteristics of healthy individuals. The study involved 79 healthy subjects of both sexes (age range 15–62 years (mean: 21.5 ± 9.6 years, women: 77.8%)). Each participant provided personal data, filled out two questionnaires, the Munich ChronoType Questionnaire (MCTQ) and the Pittsburgh Sleep Quality Index (PSQI), and wore a wrist actimeter for a week. A significant positive association of the chronotype with the mid-phase of the most active 10 h period (M10t: B = 0.252, p = 0.015), the mid-phase of the least active 5 h period (L5t: B = 0.338, p = 0.005), and the interdaily stability (IS: B = −0.021, p = 0.017) was noted, as well as the sleep duration with the M10t (B = −0.257, p = 0.003), L5t (B = −0.340, p = 0.001), and IS (B = 0.042, p = 0.003). There was a significant association of social jetlag (B = 0.320, p = 0.032) and sleep quality (B = 0.990, p = 0.013) with motor activity in bed, as well as sleep efficiency with the acrophase (B = −0.043, p = 0.007). Nonparametric indices of the 24 h rest–activity rhythm are useful tools for assessing the sleep–wake rhythm of healthy individuals.

Special Issue on “Research on Circadian Rhythms in Health and Disease”

“…The model takes into account individual differences between morning and evening chronotypes (M-types and E-types), suggesting that a larger-than-2-hour difference between M-and E-types in weekday waking times is necessary to equalize losses between these types. Borisenkov et al [4] perform a comparative analysis of actigraphic parametric and non-parametric indices regarding their agreement with the MCTQ (Munich ChronoType Questionnaire) and the PSQI (Pittsburgh Sleep Quality Index) questionnaire. They determine that non-parametric indices are better predictors than parametric ones, but find the acrophase of activity to be a useful index to predict sleep efficacy.…”