“…Trait HRV has been implicated in the inhibition of fear responses (Wendt et al, 2015) and deemed an important factor in regulating emotions in both personal and interpersonal pain contexts (Constantin, McMurtry, et al, 2017; Koenig et al, 2016; Vervoort et al, 2014, 2019), whereas much less is known about how state HRV may relate to threat-oriented states and behaviors. Preliminary work on parent trait HRV demonstrates an association with past experiences with pain (Constantin, Moline, et al, 2017) and pain control behaviors (Vervoort et al, 2019). Initial work also demonstrates that parent state HRV decreases when viewing pictures of children displaying varying levels of facial expressions of pain (Vervoort et al, 2014) and immediately before their child’s completion of the cold pressor task (CPT; Constantin, Moline, et al, 2017).…”