1074 POSTTRAUMATIC STRESS DISORDER, CANINE COMPANIONSHIP, AND SLEEP: PRELIMINARY FINDINGS

Abstract

Large numbers of Veterans with post-deployment psychological disorders have reported improvements in sleep in association with canine companionship. Studies have also provided support for an association between canine companionship and lower baseline heart rate. We tested both possibilities in a sample of combat Veterans undergoing inpatient treatment for posttraumatic stress disorder (PTSD) and participating in a Service Animal Training Intervention in which they shared custody of a service canine with another Veteran. Alternating custody enabled within-subjects modeling of associations between canine companionship and sleep. 18 military Veterans with deployment-related PTSD underwent mattress actigraphy for up to four weeks yielding 493 nights of sleep data. Mattress actigraphy relies upon accelerometers embedded in a mattress topper. The intended sleep period is delimited manually by blind raters after which sleep parameters are calculated automatically. Participants also rated morning restedness on a five-point scale following a total of 329 nights. Whether or not participants had custody of their service canines was carefully tracked. Linear mixed modeling was applied to the longitudinal data, controlling for AHI, snoring, and body movements. A random intercept was specified for each participant. Modeling morning restedness detected only main effects of minutes of actigraphic quiescence (F(1,324) = 4.44, p = 0.036) and canine presence (F(1,313) = 3.89, p = 0.049), both predictors having positive coefficients. Modeling of sleep heart rate also detected main effects of actigraphic quiescence (F(1,476) = 5.38, p = 0.021) and of canine presence (F(1,472) = 5.55, p = 0.018), as well as an effect of snoring (F(1,478) = 13.23, p = 0.0003). Quiescence and canine presence were negatively associated with sleep heart rate, while snoring was positively associated. After accounting for other predictors, canine presence was associated with lower sleep heart rate and greater morning restedness in Veterans with PTSD. Preliminarily, these results are consistent with Veterans’ reports of positive effects of a familiar canine presence on their sleep. This research was supported by Contract W81XWH-15-2-0005 to Steven H. Woodward, PhD, from the Defense Health Program, Military Operational Medical Research Program, and U.S. Army Medical Research and Materiel Command.