Christopher E. Kline - Projects

Insomnia and Cardiovascular Health Research Study

Jan 2014 - Dec 2018

We are conducting this research study to understand whether the combination of insomnia and short sleep duration increases the risk for heart disease. Insomnia is defined by difficulty falling or staying asleep even though there is adequate time for sleep. Even though adults with insomnia have problems sleeping, many are still able to obtain a sufficient amount of sleep on most nights. However, some people with insomnia also regularly obtain little sleep. We are examining whether people with insomnia who obtain little sleep are at risk for heart disease. If we find that the combination of insomnia and short sleep is related to heart disease risk, we could devise strategies on how to improve sleep for people with these sleep complaints. We are also looking for adults without sleep complaints to serve as a comparison group.

Concordance between commercial sleep trackers and field-based sleep research devices

Jan 2017

Very little validation evidence exists for the sleep-tracking features of the vast majority of commercial fitness trackers. Specifically, we know very little about how closely the sleep data provided by commercial fitness trackers are concordant with sleep data provided by research-based devices. This study will provide important information about the equivalence of sleep data obtained from commercial fitness trackers and research-based devices. If found to be equivalent to research-based devices, commercial fitness trackers could be advocated for use in research due to their lower cost and their acceptability among adults. Conversely, findings of non-equivalence between these devices is important to know, since some researchers are already using commercial devices to assess sleep in their studies.

The overall purpose of this study is to examine the level of concordance between the sleep-tracking data provided by 7 commercial fitness trackers (Fitbit Alta, Garmin Vivosmart HR, Jawbone UP3, Misfit Shine, Polar A360, Samsung Gear Fit 2, Xiaomi Mi Pulse) and a research-based sleep device (Philips Actiwatch Spectrum).