Olson KayLoni L, Goldstein Stephanie P, Wing Rena R, Williams David M, Demos Kathryn E, Unick Jessica L
Department of Psychiatry and Human Behavior Brown Medical School Providence Rhode Island USA.
Weight Control and Diabetes Research Center The Miriam Hospital Providence Rhode Island USA.
Obes Sci Pract. 2021 Apr 6;7(4):405-414. doi: 10.1002/osp4.494. eCollection 2021 Aug.
For individuals with overweight/obesity, internalized weight bias (IWB) is linked to low physical activity (PA). This study used a laboratory-based paradigm to test the hypothesis that IWB moderates the association between heart rate (HR) and perceived exertion and affect during PA.
Participants with overweight/obesity completed 30-min of supervised moderate-intensity treadmill walking (65%-75% of age-predicted maximal HR). Body Mass Index (BMI) and Weight Bias Internalization Scale were assessed at baseline. HR was monitored every minute; perceived exertion and affect were assessed every 5 min. Linear mixed models were employed with random effects of time and participant.
The sample ( = 59; 79.7% female, 91.5% white) had an average BMI = 32.1 kg/m (SD: 3.3), and age = 47.1 (SD: 10.3) years. There was a main effect of IWB on perceived exertion (greater IWB was associated with greater perceived exertion during exercise; < 0.001). There was an interaction of IWB and HR on affect ( = -0.01, < 0.01). For individuals with high IWB, HR elevations were associated with a negative affective response during exercise. For individuals with low IWB, HR elevations were associated with increased positive affect during PA.
Findings indicate that among individuals of higher body weight, IWB is associated with reporting higher perceived exertion during 30 min of moderate intensity PA. IWB moderated the relationship between increasing HR during exercise and affect. Among individuals with overweight/obesity who report IWB, the initial experience of PA may be harder and more unpleasant, with lasting implications for the adoption of PA.
对于超重/肥胖个体，内化的体重偏见（IWB）与低体力活动（PA）相关。本研究采用基于实验室的范式来检验IWB调节心率（HR）与体力活动期间感知运动用力和情感之间关联的假设。
超重/肥胖参与者完成30分钟的有监督的中等强度跑步机行走（65%-75%的年龄预测最大心率）。在基线时评估体重指数（BMI）和体重偏见内化量表。每分钟监测心率；每5分钟评估感知运动用力和情感。采用线性混合模型，纳入时间和参与者的随机效应。
样本（n = 59；79.7%为女性，91.5%为白人）的平均BMI = 32.1 kg/m²（标准差：3.3），年龄 = 47.1（标准差：10.3）岁。IWB对感知运动用力有主效应（IWB越高，运动期间感知运动用力越大；p < 0.001）。IWB和HR对情感有交互作用（β = -0.01，p < 0.01）。对于高IWB个体，心率升高与运动期间的负面情感反应相关。对于低IWB个体，心率升高与体力活动期间积极情感增加相关。
研究结果表明，在体重较高的个体中，IWB与在30分钟中等强度体力活动期间报告较高的感知运动用力相关。IWB调节了运动期间心率增加与情感之间的关系。在报告有IWB的超重/肥胖个体中，体力活动的初始体验可能更艰难、更不愉快，对体力活动的采用有持久影响。
