The scale-free nature of daily human activity has been observed in different aspects;
however, the description of its spectral characteristics is incomplete. General findings are …

Accelerometers, devices that measure body movements, have become valuable tools for
studying the fragmentation of rest-activity patterns, a core circadian rhythm dimension, using …

It has been found that fractal-like patterns are present in the temporal structure of the
variability of healthy biological rhythms, while pathology and disease lead to their …

We study the effective scaling behavior of high-resolution accelerometric time series
recorded at the wrists and hips of 100 subjects during sleep and wake. Using spectral …

The interpretation and characterization of universal scaling laws in human mobility and
activity are subjects of active research. For the better understanding, instead of the statistical …

Aerobic and anaerobic thresholds of the three-zone exercise model are often used to
evaluate the exercise intensity and optimize the training load. Conventionally, these …

We investigate long-duration time series of human physical activity under three different
conditions: healthy individuals in i) a constant routine protocol and ii) in regular daily routine …

The heart rate (HR) exhibits various behavior patterns in different postures and during
physical activities, whereas a conventional long-term analysis of HR variability has the …

While the negative association between physical activity and depression has been well
established, it is unclear what precise characteristics of physical activity patterns explain this …

Heart rate self-affinity is often assessed by detrended fluctuations analysis, obtaining two
coefficients only: a short-term (alpha 1) exponent and a long-term (alpha 2) exponent. Our …