The effects of an acute weight stigma exposure on cardiovascular reactivity among women with obesity and hypertension: A randomized trial

Objective: Weight stigma induces cardiovascular health consequences for people with obesity. How stigma affects cardiovascular reactivity in individuals with both obesity and hypertension is not known.

Methods: In a randomized experiment, we assessed the influence of two video exposures, depicting either weight stigmatizing (STIGMA) or non-stigmatizing (NEUTRAL) scenes, on cardiovascular reactivity [resting blood pressure (BP), heart rate (HR), ambulatory BP (ABP), and ambulatory HR (AHR)], among women with obesity and high BP (HBP; n=24) or normal BP (NBP; n=25). Systolic ABP reactivity was the primary outcome. Laboratory BP and HR were measured before/during/following the videos, and ABP and AHR were measured over 19 hours (10 awake hours, 9 sleep hours) upon leaving the laboratory. A repeated measures ANCOVA tested differences in BP and HR changes from baseline in the laboratory and over ambulatory conditions between the two groups after each video, controlling for body mass index, baseline BP and HR.

Results: Laboratory SBP/DBP increased 5.5+7.3/2.4+8.8mmHg more in women with HBP than NBP following the STIGMA versus NEUTRAL video (Ps<0.05). For the primary outcome, ABP increased more in HBP than NBP over sleep (SBP/DBP=4.2+20.6/4.7+14.2mmHg; Ps<0.05) following the STIGMA versus NEUTRAL video, as did HR during sleep (7.5+15.7bpm more in HBP than NBP; P<0.05).

Conclusions: Weight stigma increases cardiovascular reactivity among women with obesity and HBP in the laboratory and under ambulatory conditions.

Clinical trial registration: Registered at ClinicalTrials.gov (Identifier: NCT04161638).